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Tazes I, Passalidis S, Kaselouris E, Mancelli D, Karvounis C, Skoulakis A, Fitilis I, Bakarezos M, Papadogiannis NA, Dimitriou V, Tatarakis M. Efficient Magnetic Vortex Acceleration by femtosecond laser interaction with long living optically shaped gas targets in the near critical density plasma regime. Sci Rep 2024; 14:4945. [PMID: 38418538 PMCID: PMC10901874 DOI: 10.1038/s41598-024-54475-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 02/12/2024] [Indexed: 03/01/2024] Open
Abstract
We introduce a novel, gaseous target optical shaping laser set-up, capable to generate short scale length, near-critical target profiles via generated colliding blast waves. These profiles are capable to maintain their compressed density for several nanoseconds, being therefore ideal for laser-plasma particle acceleration experiments in the near critical density plasma regime. Our proposed method overcomes the laser-target synchronization limitations and delivers energetic protons, during the temporal evolution of the optically shaped profile, in a time window of approximately 2.5 ns. The optical shaping of the gas-jet profiles is optimised by MagnetoHydroDynamic simulations. 3D Particle-In-Cell models, adopting the spatiotemporal profile, simulate the 45 TW femtosecond laser plasma interaction to demonstrate the feasibility of the proposed proton acceleration set-up. The optical shaping of gas-jets is performed by multiple, nanosecond laser pulse generated blastwaves. This process results in steep gradient, short scale length plasma profiles, in the near critical density regime allowing operation at high repetition rates. Notably, the Magnetic Vortex Acceleration mechanism exhibits high efficiency in coupling the laser energy into the plasma in the optically shaped targets, resulting to collimated proton beams of energies up to 14 MeV.
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Affiliation(s)
- I Tazes
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece
- Department of Electronic Engineering, Hellenic Mediterranean University, 73133, Chania, Greece
| | - S Passalidis
- CEA, DAM, DIF, 91297, Arpajon, France
- Université Paris-Saclay, CEA, LMCE, 91680, Bruyères-le-Châtel, France
| | - E Kaselouris
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece
- Physical Acoustics and Optoacoustics Laboratory, Department of Music Technology and Acoustics, Hellenic Mediterranean University, 74100, Rethymno, Greece
| | - D Mancelli
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece
- Department of Electronic Engineering, Hellenic Mediterranean University, 73133, Chania, Greece
| | - C Karvounis
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece
- Department of Electronic Engineering, Hellenic Mediterranean University, 73133, Chania, Greece
| | - A Skoulakis
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece
- Department of Electronic Engineering, Hellenic Mediterranean University, 73133, Chania, Greece
| | - I Fitilis
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece
- Department of Electronic Engineering, Hellenic Mediterranean University, 73133, Chania, Greece
| | - M Bakarezos
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece
- Physical Acoustics and Optoacoustics Laboratory, Department of Music Technology and Acoustics, Hellenic Mediterranean University, 74100, Rethymno, Greece
| | - N A Papadogiannis
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece
- Physical Acoustics and Optoacoustics Laboratory, Department of Music Technology and Acoustics, Hellenic Mediterranean University, 74100, Rethymno, Greece
| | - V Dimitriou
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece.
- Physical Acoustics and Optoacoustics Laboratory, Department of Music Technology and Acoustics, Hellenic Mediterranean University, 74100, Rethymno, Greece.
| | - M Tatarakis
- Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Centre, Hellenic Mediterranean University, 74100, Rethymno, Greece.
- Department of Electronic Engineering, Hellenic Mediterranean University, 73133, Chania, Greece.
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2
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Rehwald M, Assenbaum S, Bernert C, Brack FE, Bussmann M, Cowan TE, Curry CB, Fiuza F, Garten M, Gaus L, Gauthier M, Göde S, Göthel I, Glenzer SH, Huang L, Huebl A, Kim JB, Kluge T, Kraft S, Kroll F, Metzkes-Ng J, Miethlinger T, Loeser M, Obst-Huebl L, Reimold M, Schlenvoigt HP, Schoenwaelder C, Schramm U, Siebold M, Treffert F, Yang L, Ziegler T, Zeil K. Ultra-short pulse laser acceleration of protons to 80 MeV from cryogenic hydrogen jets tailored to near-critical density. Nat Commun 2023; 14:4009. [PMID: 37419912 DOI: 10.1038/s41467-023-39739-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 06/26/2023] [Indexed: 07/09/2023] Open
Abstract
Laser plasma-based particle accelerators attract great interest in fields where conventional accelerators reach limits based on size, cost or beam parameters. Despite the fact that particle in cell simulations have predicted several advantageous ion acceleration schemes, laser accelerators have not yet reached their full potential in producing simultaneous high-radiation doses at high particle energies. The most stringent limitation is the lack of a suitable high-repetition rate target that also provides a high degree of control of the plasma conditions required to access these advanced regimes. Here, we demonstrate that the interaction of petawatt-class laser pulses with a pre-formed micrometer-sized cryogenic hydrogen jet plasma overcomes these limitations enabling tailored density scans from the solid to the underdense regime. Our proof-of-concept experiment demonstrates that the near-critical plasma density profile produces proton energies of up to 80 MeV. Based on hydrodynamic and three-dimensional particle in cell simulations, transition between different acceleration schemes are shown, suggesting enhanced proton acceleration at the relativistic transparency front for the optimal case.
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Affiliation(s)
- Martin Rehwald
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany.
- Technische Universität Dresden, 01062, Dresden, Germany.
| | - Stefan Assenbaum
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Constantin Bernert
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Florian-Emanuel Brack
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Michael Bussmann
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Center for Advanced Systems Understanding (CASUS), 02826, Görlitz, Germany
| | - Thomas E Cowan
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Chandra B Curry
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
- University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Frederico Fiuza
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Marco Garten
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Lennart Gaus
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Maxence Gauthier
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Sebastian Göde
- European XFEL GmbH, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Ilja Göthel
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Siegfried H Glenzer
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Lingen Huang
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
| | - Axel Huebl
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Jongjin B Kim
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Thomas Kluge
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
| | - Stephan Kraft
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
| | - Florian Kroll
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
| | - Josefine Metzkes-Ng
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
| | - Thomas Miethlinger
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Markus Loeser
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
| | - Lieselotte Obst-Huebl
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Marvin Reimold
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Hans-Peter Schlenvoigt
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
| | - Christopher Schoenwaelder
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
- Friedrich-Alexander Universität Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Ulrich Schramm
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Mathias Siebold
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
| | - Franziska Treffert
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
- Technische Universität Darmstadt, 64289, Darmstadt, Germany
| | - Long Yang
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Tim Ziegler
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Karl Zeil
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany
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3
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Lécz Z, Sharma A, Andreev A, Fülöp J, Kamperidis C. Sliding-wave acceleration of ions in high-density gas jet targets. Phys Rev E 2021; 103:053210. [PMID: 34134310 DOI: 10.1103/physreve.103.053210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 05/11/2021] [Indexed: 11/07/2022]
Abstract
A hybrid mechanism of ion acceleration is investigated which demonstrates the higher spectral density of protons at high energies. The interaction of few-cycle terrawatt laser pulses with near-critical density gas target is studied with the help of two-dimensional particle-in-cell simulation. The generation of few MeV protons with high spectral concentration near cutoff is attributed to the propagation of solitary waves in the decaying density profile of the gas jet. Plasma dynamics at longer time scale is explained by semianalytical modeling and conditions for solitary wave breaking are presented.
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Affiliation(s)
- Zsolt Lécz
- ELI-ALPS, ELI-HU NKft. Dugonics square 13., 6720 Szeged, Hungary
| | - Ashutosh Sharma
- ELI-ALPS, ELI-HU NKft. Dugonics square 13., 6720 Szeged, Hungary
| | - Alexander Andreev
- ELI-ALPS, ELI-HU NKft. Dugonics square 13., 6720 Szeged, Hungary.,Max-Born Institute, Berlin, Germany
| | - József Fülöp
- ELI-ALPS, ELI-HU NKft. Dugonics square 13., 6720 Szeged, Hungary.,Institute of Physics, University of Pécs, Ifjúság str. 6, 7624 Pécs, Hungary
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4
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Gong Z, Shou Y, Tang Y, Hu R, Yu J, Ma W, Lin C, Yan X. Proton sheet crossing in thin relativistic plasma irradiated by a femtosecond petawatt laser pulse. Phys Rev E 2020; 102:013207. [PMID: 32795002 DOI: 10.1103/physreve.102.013207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Accepted: 06/09/2020] [Indexed: 11/07/2022]
Abstract
Leveraging on analyses of Hamiltonian dynamics to examine the ion motion, we explicitly demonstrate that the proton sheet crossing and plateau-type energy spectrum are two intrinsic features of the effectively accelerated proton beams driven by a drift quasistatic longitudinal electric field. Via two-dimensional particle-in-cell simulations, we show the emergence of proton sheet crossing in a relativistically transparent plasma foil irradiated by a linearly polarized short pulse with the power of one petawatt. Instead of successively blowing the whole foil forward, the incident laser pulse readily penetrates through the plasma bulk, where the proton sheet crossing takes place and the merged self-generated longitudinal electric field traps and reflects the protons to yield a group of protons with plateau-type energy spectrum.
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Affiliation(s)
- Zheng Gong
- State Key Laboratory of Nuclear Physics and Technology, KLHEDP, and CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Yinren Shou
- State Key Laboratory of Nuclear Physics and Technology, KLHEDP, and CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Yuhui Tang
- State Key Laboratory of Nuclear Physics and Technology, KLHEDP, and CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Ronghao Hu
- College of Physics, Sichuan University, Chengdu 610065, China
| | - Jinqing Yu
- School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Wenjun Ma
- State Key Laboratory of Nuclear Physics and Technology, KLHEDP, and CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Chen Lin
- State Key Laboratory of Nuclear Physics and Technology, KLHEDP, and CAPT, School of Physics, Peking University, Beijing 100871, China
| | - Xueqing Yan
- State Key Laboratory of Nuclear Physics and Technology, KLHEDP, and CAPT, School of Physics, Peking University, Beijing 100871, China.,Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
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5
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Gong Z, Mackenroth F, Wang T, Yan XQ, Toncian T, Arefiev AV. Direct laser acceleration of electrons assisted by strong laser-driven azimuthal plasma magnetic fields. Phys Rev E 2020; 102:013206. [PMID: 32795027 DOI: 10.1103/physreve.102.013206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 06/09/2020] [Indexed: 06/11/2023]
Abstract
A high-intensity laser beam propagating through a dense plasma drives a strong current that robustly sustains a strong quasistatic azimuthal magnetic field. The laser field efficiently accelerates electrons in such a field that confines the transverse motion and deflects the electrons in the forward direction. Its advantage is a threshold rather than resonant behavior, accelerating electrons to high energies for sufficiently strong laser-driven currents. We study the electron dynamics via a test-electron model, specifically deriving the corresponding critical current density. We confirm the model's predictions by numerical simulations, indicating energy gains two orders of magnitude higher than achievable without the magnetic field.
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Affiliation(s)
- Z Gong
- SKLNPT, KLHEDP and CAPT, School of Physics, Peking University, Beijing 100871, China
- Center for High Energy Density Science, The University of Texas at Austin, Austin, Texas 78712, USA
| | - F Mackenroth
- Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - T Wang
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - X Q Yan
- SKLNPT, KLHEDP and CAPT, School of Physics, Peking University, Beijing 100871, China
| | - T Toncian
- Institute for Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf e.V., 01328 Dresden, Germany
| | - A V Arefiev
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA
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6
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Gong Z, Mackenroth F, Yan XQ, Arefiev AV. Radiation reaction as an energy enhancement mechanism for laser-irradiated electrons in a strong plasma magnetic field. Sci Rep 2019; 9:17181. [PMID: 31748597 PMCID: PMC6868192 DOI: 10.1038/s41598-019-53644-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 11/04/2019] [Indexed: 11/15/2022] Open
Abstract
Conventionally, friction is understood as a mechanism depleting a physical system of energy and as an unavoidable feature of any realistic device involving moving parts. In this work, we demonstrate that this intuitive picture loses validity in nonlinear quantum electrodynamics, exemplified in a scenario where spatially random friction counter-intuitively results in a highly directional energy flow. This peculiar behavior is caused by radiation friction, i.e., the energy loss of an accelerated charge due to the emission of radiation. We demonstrate analytically and numerically how radiation friction can dramatically enhance the energy gain by electrons from a laser pulse in a strong magnetic field that naturally arises in dense laser-irradiated plasma. We find the directional energy boost to be due to the transverse electron momentum being reduced through friction whence the driving laser can accelerate the electron more efficiently. In the considered example, the energy of the laser-accelerated electrons is enhanced by orders of magnitude, which then leads to highly directional emission of gamma-rays induced by the plasma magnetic field.
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Affiliation(s)
- Z Gong
- SKLNPT, KLHEDP and CAPT, School of Physics, Peking University, Beijing, 100871, China.,Center for High Energy Density Science, The University of Texas at Austin, Austin, TX, 78712, USA
| | - F Mackenroth
- Max Planck Institute for the Physics of Complex Systems, 01187, Dresden, Germany.,Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA, 92093, USA
| | - X Q Yan
- SKLNPT, KLHEDP and CAPT, School of Physics, Peking University, Beijing, 100871, China
| | - A V Arefiev
- Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA, 92093, USA. .,Center for Energy Research, University of California at San Diego, La Jolla, CA, 92093, USA.
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7
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Sharma A, Kamperidis C. High energy proton micro-bunches from a laser plasma accelerator. Sci Rep 2019; 9:13840. [PMID: 31554895 PMCID: PMC6761098 DOI: 10.1038/s41598-019-50348-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 09/10/2019] [Indexed: 11/15/2022] Open
Abstract
Recent advances on laser-driven ion accelerators have sparked an increased interest in such energetic particle sources, particularly towards the viability of their usage in a breadth of applications, such as high energy physics and medical applications. Here, we identify a new ion acceleration mechanism and we demonstrate, via particle-in-cell simulations, for the first time the generation of high energy, monochromatic proton micro-bunches while witnessing the acceleration and self-modulation of the accelerated proton beam in a dual-gas target, consisting of mixed ion species. In the proposed ion acceleration mechanism due to the interaction of an ultra-short, ultra-intense (2 PW, 20 fs) laser pulses with near-critical-density partially ionized plasmas (C & H species), we numerically observed high energy monochromatic proton microbunches of high quality (peak proton energy 350 MeV, laser to proton conversion efficiency ~10-4 and angular divergence <10 degree), which can be of high relevance for medical applications. We envisage that through this scheme, the range of attained energies and the monochromaticity of the accelerated protons can be increased with existing laser facilities or allow for laser-driven ion acceleration investigations to be pursued at moderate energies in smaller scale laser laboratories, hence reducing the size of the accelerators. The use of mixed-gas targets will enable high repetition rate operation of these accelerators, free of plasma debris and electromagnetic pulse disruptions.
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Affiliation(s)
- Ashutosh Sharma
- ELI-ALPS, ELI-HU Non-Profit Ltd., Dugonics ter 13, H-6720 Szeged, Hungary.
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8
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Li J, Arefiev AV, Bulanov SS, Kawahito D, Bailly-Grandvaux M, Petrov GM, McGuffey C, Beg FN. Ionization injection of highly-charged copper ions for laser driven acceleration from ultra-thin foils. Sci Rep 2019; 9:666. [PMID: 30679670 PMCID: PMC6345865 DOI: 10.1038/s41598-018-37085-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Accepted: 11/25/2018] [Indexed: 11/09/2022] Open
Abstract
Laser-driven ion acceleration is often analyzed assuming that ionization reaches a steady state early in the interaction of the laser pulse with the target. This assumption breaks down for materials of high atomic number for which the ionization occurs concurrently with the acceleration process. Using particle-in-cell simulations, we have examined acceleration and simultaneous field ionization of copper ions in ultra-thin targets (20-150 nm thick) irradiated by a laser pulse with intensity 1 × 1021 W/cm2. At this intensity, the laser pulse drives strong electric fields at the rear side of the target that can ionize Cu to charge states with valence L-shell or full K-shell. The highly-charged ions are produced only in a very localized region due to a significant gap between the M- and L-shells' ionization potentials and can be accelerated by strong, forward-directed sections of the field. Such an "ionization injection" leads to well-pronounced bunches of energetic, highly-charged ions. We also find that for the thinnest target (20 nm) a push by the laser further increases the ion energy gain. Thus, the field ionization, concurrent with the acceleration, offers a promising mechanism for the production of energetic, high-charge ion bunches.
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Affiliation(s)
- Jun Li
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - Alexey V Arefiev
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA, 92093, USA
| | | | - Daiki Kawahito
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | | | - George M Petrov
- Naval Research Laboratory, Plasma Physics Division, Washington, DC, 20375, USA
| | - Christopher McGuffey
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - Farhat N Beg
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA.
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA, 92093, USA.
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9
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Murakami M, Arefiev A, Zosa MA. Generation of ultrahigh field by micro-bubble implosion. Sci Rep 2018; 8:7537. [PMID: 29795389 PMCID: PMC5967333 DOI: 10.1038/s41598-018-25594-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 04/25/2018] [Indexed: 12/02/2022] Open
Abstract
Breaking the 100-MeV barrier for proton acceleration will help elucidate fundamental physics and advance practical applications from inertial confinement fusion to tumour therapy. Herein we propose a novel concept of bubble implosions. A bubble implosion combines micro-bubbles and ultraintense laser pulses of 1020–1022 W cm−2 to generate ultrahigh fields and relativistic protons. The bubble wall protons undergo volumetric acceleration toward the centre due to the spherically symmetric Coulomb force and the innermost protons accumulate at the centre with a density comparable to the interior of a white dwarf. Then an unprecedentedly high electric field is formed, which produces an energetic proton flash. Three-dimensional particle simulations confirm the robustness of Coulomb-imploded bubbles, which behave as nano-pulsars with repeated implosions and explosions to emit protons. Current technologies should be sufficient to experimentally verify concept of bubble implosions.
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Affiliation(s)
- M Murakami
- Institute of Laser Engineering, Osaka University, Osaka, 565-0871, Japan.
| | - A Arefiev
- UC San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0411, USA
| | - M A Zosa
- Institute of Laser Engineering, Osaka University, Osaka, 565-0871, Japan
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10
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Sharma A. High Energy electron and proton acceleration by circularly polarized laser pulse from near critical density hydrogen gas target. Sci Rep 2018; 8:2191. [PMID: 29391470 PMCID: PMC5794773 DOI: 10.1038/s41598-018-20506-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 01/19/2018] [Indexed: 11/26/2022] Open
Abstract
Relativistic electron rings hold the possibility of very high accelerating rates, and hopefully a relatively cheap and compact accelerator/collimator for ultrahigh energy proton source. In this work, we investigate the generation of helical shaped quasi-monoenergetic relativistic electron beam and high-energy proton beam from near critical density plasmas driven by petawatt-circularly polarized-short laser pulses. We numerically observe the efficient proton acceleration from magnetic vortex acceleration mechanism by using the three dimensional particle-in-cell simulations; proton beam with peak energy 350 MeV, charge ~10nC and conversion efficiency more than 6% (which implies 2.4 J proton beam out of the 40 J incident laser energy) is reported. We detailed the microphysics involved in the ion acceleration mechanism, which requires investigating the role of self-generated plasma electric and magnetic fields. The concept of efficient generation of quasi-monoenergetic electron and proton beam from near critical density gas targets may be verified experimentally at advanced high power – high repetition rate laser facilities e.g. ELI-ALPS. Such study should be an important step towards the development of high quality electron and proton beam.
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Affiliation(s)
- Ashutosh Sharma
- ELI-ALPS, ELI-HU Non-Profit Ltd., Dugonics ter 13, H-6720 Szeged, Hungary.
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11
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Burst intensification by singularity emitting radiation in multi-stream flows. Sci Rep 2017; 7:17968. [PMID: 29269841 PMCID: PMC5740116 DOI: 10.1038/s41598-017-17498-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 11/27/2017] [Indexed: 11/08/2022] Open
Abstract
Burst Intensification by Singularity Emitting Radiation (BISER) is proposed. Singularities in multi-stream flows of emitting media cause constructive interference of emitted travelling waves, forming extremely localized sources of bright coherent emission. Here we for the first time demonstrate this extreme localization of BISER by direct observation of nano-scale coherent x-ray sources in a laser plasma. The energy emitted into the spectral range from 60 to 100 eV is up to ~100 nJ, corresponding to ~1010 photons. Simulations reveal that these sources emit trains of attosecond x-ray pulses. Our findings establish a new class of bright laboratory sources of electromagnetic radiation. Furthermore, being applicable to travelling waves of any nature (e.g. electromagnetic, gravitational or acoustic), BISER provides a novel framework for creating new emitters and for interpreting observations in many fields of science.
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12
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Acceleration of collimated 45 MeV protons by collisionless shocks driven in low-density, large-scale gradient plasmas by a 10 20 W/cm 2, 1 µm laser. Sci Rep 2017; 7:16463. [PMID: 29184108 PMCID: PMC5705667 DOI: 10.1038/s41598-017-15449-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 10/24/2017] [Indexed: 11/08/2022] Open
Abstract
A new type of proton acceleration stemming from large-scale gradients, low-density targets, irradiated by an intense near-infrared laser is observed. The produced protons are characterized by high-energies (with a broad spectrum), are emitted in a very directional manner, and the process is associated to relaxed laser (no need for high-contrast) and target (no need for ultra-thin or expensive targets) constraints. As such, this process appears quite effective compared to the standard and commonly used Target Normal Sheath Acceleration technique (TNSA), or more exploratory mechanisms like Radiation Pressure Acceleration (RPA). The data are underpinned by 3D numerical simulations which suggest that in these conditions a Low Density Collisionless Shock Acceleration (LDCSA) mechanism is at play, which combines an initial Collisionless Shock Acceleration (CSA) to a boost procured by a TNSA-like sheath field in the downward density ramp of the target, leading to an overall broad spectrum. Experiments performed at a laser intensity of 1020 W/cm2 show that LDCSA can accelerate, from ~1% critical density, mm-scale targets, up to 5 × 109 protons/MeV/sr/J with energies up to 45(±5) MeV in a collimated (~6° half-angle) manner.
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13
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Chen SN, Vranic M, Gangolf T, Boella E, Antici P, Bailly-Grandvaux M, Loiseau P, Pépin H, Revet G, Santos JJ, Schroer AM, Starodubtsev M, Willi O, Silva LO, d'Humières E, Fuchs J. Collimated protons accelerated from an overdense gas jet irradiated by a 1 µm wavelength high-intensity short-pulse laser. Sci Rep 2017; 7:13505. [PMID: 29044204 PMCID: PMC5647424 DOI: 10.1038/s41598-017-12910-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 09/12/2017] [Indexed: 11/29/2022] Open
Abstract
We have investigated proton acceleration in the forward direction from a near-critical density hydrogen gas jet target irradiated by a high intensity (1018 W/cm2), short-pulse (5 ps) laser with wavelength of 1.054 μm. We observed the signature of the Collisionless Shock Acceleration mechanism, namely quasi-monoenergetic proton beams with small divergence in addition to the more commonly observed electron-sheath driven proton acceleration. The proton energies we obtained were modest (~MeV), but prospects for improvement are offered through further tailoring the gas jet density profile. Also, we observed that this mechanism is very robust in producing those beams and thus can be considered as a future candidate in laser-driven ion sources driven by the upcoming next generation of multi-PW near-infrared lasers.
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Affiliation(s)
- S N Chen
- LULI - CNRS, Ecole Polytechnique, CEA: Université Paris-Saclay; UPMC Univ Paris 06: Sorbonne Universités, F-91128, Palaiseau cedex, France.
- Institute of Applied Physics, 46 Ulyanov Street, 603950, Nizhny Novgorod, Russia.
- Light Stream Labs LLC., Sunnyvale, CA, USA.
| | - M Vranic
- GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisboa, Portugal
| | - T Gangolf
- LULI - CNRS, Ecole Polytechnique, CEA: Université Paris-Saclay; UPMC Univ Paris 06: Sorbonne Universités, F-91128, Palaiseau cedex, France
- Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, 40225, Düsseldorf, Germany
| | - E Boella
- GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisboa, Portugal
| | - P Antici
- INRS-EMT, 1650, boulevard Lionel-Boulet, J3X 1S2, Varennes (Québec), Canada
| | - M Bailly-Grandvaux
- Univ. Bordeaux, CNRS, CEA, CELIA (Centre Laser Intenses et Applications), UMR 5107, F-33405, Talence, France
| | - P Loiseau
- CEA, DAM, DIF, F-91297, Arpajon, France
| | - H Pépin
- INRS-EMT, 1650, boulevard Lionel-Boulet, J3X 1S2, Varennes (Québec), Canada
| | - G Revet
- LULI - CNRS, Ecole Polytechnique, CEA: Université Paris-Saclay; UPMC Univ Paris 06: Sorbonne Universités, F-91128, Palaiseau cedex, France
- Institute of Applied Physics, 46 Ulyanov Street, 603950, Nizhny Novgorod, Russia
| | - J J Santos
- Univ. Bordeaux, CNRS, CEA, CELIA (Centre Laser Intenses et Applications), UMR 5107, F-33405, Talence, France
| | - A M Schroer
- Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, 40225, Düsseldorf, Germany
| | - Mikhail Starodubtsev
- Institute of Applied Physics, 46 Ulyanov Street, 603950, Nizhny Novgorod, Russia
| | - O Willi
- Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, 40225, Düsseldorf, Germany
| | - L O Silva
- GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisboa, Portugal
| | - E d'Humières
- Univ. Bordeaux, CNRS, CEA, CELIA (Centre Laser Intenses et Applications), UMR 5107, F-33405, Talence, France
| | - J Fuchs
- LULI - CNRS, Ecole Polytechnique, CEA: Université Paris-Saclay; UPMC Univ Paris 06: Sorbonne Universités, F-91128, Palaiseau cedex, France
- Institute of Applied Physics, 46 Ulyanov Street, 603950, Nizhny Novgorod, Russia
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14
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Yogo A, Mima K, Iwata N, Tosaki S, Morace A, Arikawa Y, Fujioka S, Johzaki T, Sentoku Y, Nishimura H, Sagisaka A, Matsuo K, Kamitsukasa N, Kojima S, Nagatomo H, Nakai M, Shiraga H, Murakami M, Tokita S, Kawanaka J, Miyanaga N, Yamanoi K, Norimatsu T, Sakagami H, Bulanov SV, Kondo K, Azechi H. Boosting laser-ion acceleration with multi-picosecond pulses. Sci Rep 2017; 7:42451. [PMID: 28211913 PMCID: PMC5304168 DOI: 10.1038/srep42451] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 01/09/2017] [Indexed: 11/28/2022] Open
Abstract
Using one of the world most powerful laser facility, we demonstrate for the first time that high-contrast multi-picosecond pulses are advantageous for proton acceleration. By extending the pulse duration from 1.5 to 6 ps with fixed laser intensity of 1018 W cm-2, the maximum proton energy is improved more than twice (from 13 to 33 MeV). At the same time, laser-energy conversion efficiency into the MeV protons is enhanced with an order of magnitude, achieving 5% for protons above 6 MeV with the 6 ps pulse duration. The proton energies observed are discussed using a plasma expansion model newly developed that takes the electron temperature evolution beyond the ponderomotive energy in the over picoseconds interaction into account. The present results are quite encouraging for realizing ion-driven fast ignition and novel ion beamlines.
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Affiliation(s)
- A. Yogo
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - K. Mima
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
- The Graduate School for the Creation of New Photon Industries, Hamamatsu, Shizuoka 431-1202, Japan
| | - N. Iwata
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - S. Tosaki
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - A. Morace
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - Y. Arikawa
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - S. Fujioka
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - T. Johzaki
- Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8511, Japan
| | - Y. Sentoku
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - H. Nishimura
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - A. Sagisaka
- Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology, Kizugawa 619-0215, Kyoto, Japan
| | - K. Matsuo
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - N. Kamitsukasa
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - S. Kojima
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - H. Nagatomo
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - M. Nakai
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - H. Shiraga
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - M. Murakami
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - S. Tokita
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - J. Kawanaka
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - N. Miyanaga
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - K. Yamanoi
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - T. Norimatsu
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
| | - H. Sakagami
- National Institute for Fusion Science, Gifu 509-5292, Japan
| | - S. V. Bulanov
- Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology, Kizugawa 619-0215, Kyoto, Japan
| | - K. Kondo
- Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology, Kizugawa 619-0215, Kyoto, Japan
| | - H. Azechi
- Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan
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15
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Cialfi L, Fedeli L, Passoni M. Electron heating in subpicosecond laser interaction with overdense and near-critical plasmas. Phys Rev E 2016; 94:053201. [PMID: 27967191 DOI: 10.1103/physreve.94.053201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Indexed: 06/06/2023]
Abstract
In this work we investigate electron heating induced by intense laser interaction with micrometric flat solid foils in the context of laser-driven ion acceleration. We propose a simple law to predict the electron temperature in a wider range of laser parameters with respect to commonly used existing models. An extensive two-dimensional (2D) and 3D numerical campaign shows that electron heating is due to the combined actions of j×B and Brunel effect. Electron temperature can be well described with a simple function of pulse intensity and angle of incidence, with parameters dependent on pulse polarization. We then combine our model for the electron temperature with an existing model for laser-ion acceleration, using recent experimental results as a benchmark. We also discuss an exploratory attempt to model electron temperature for multilayered foam-attached targets, which have been proven recently to be an attractive target concept for laser-driven ion acceleration.
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Affiliation(s)
- L Cialfi
- Department of Energy, Politecnico di Milano University, Milan, Italy
| | - L Fedeli
- Department of Energy, Politecnico di Milano University, Milan, Italy
| | - M Passoni
- Department of Energy, Politecnico di Milano University, Milan, Italy
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16
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Helle MH, Gordon DF, Kaganovich D, Chen Y, Palastro JP, Ting A. Laser-Accelerated Ions from a Shock-Compressed Gas Foil. PHYSICAL REVIEW LETTERS 2016; 117:165001. [PMID: 27792379 DOI: 10.1103/physrevlett.117.165001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Indexed: 06/06/2023]
Abstract
We present results of energetic laser-ion acceleration from a tailored, near solid density gas target. Colliding hydrodynamic shocks compress a pure hydrogen gas jet into a 70 μm thick target prior to the arrival of the ultraintense laser pulse. A density scan reveals the transition from a regime characterized by a wide angle, low-energy beam (target normal sheath acceleration) to one of a more focused beam with a high-energy halo (magnetic vortex acceleration). In the latter case, three-dimensional simulations show the formation of a Z pinch driven by the axial current resulting from laser wakefield accelerated electrons. Ions at the rear of the target are then accelerated by a combination of space charge fields from accelerated electrons and Coulombic repulsion as the pinch dissipates.
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Affiliation(s)
- M H Helle
- Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, USA
| | - D F Gordon
- Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, USA
| | - D Kaganovich
- Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, USA
| | - Y Chen
- Research Support Instruments, Lanham, Maryland 20706, USA
| | - J P Palastro
- Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, USA
| | - A Ting
- Research Support Instruments, Lanham, Maryland 20706, USA
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17
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Kahaly S, Sylla F, Lifschitz A, Flacco A, Veltcheva M, Malka V. Detailed Experimental Study of Ion Acceleration by Interaction of an Ultra-Short Intense Laser with an Underdense Plasma. Sci Rep 2016; 6:31647. [PMID: 27531755 PMCID: PMC4987697 DOI: 10.1038/srep31647] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 07/22/2016] [Indexed: 11/15/2022] Open
Abstract
Ion acceleration from intense (Iλ2 > 1018 Wcm−2 μm2) laser-plasma interaction is experimentally studied within a wide range of He gas densities. Focusing an ultrashort pulse (duration ion plasma period) on a newly designed submillimetric gas jet system, enabled us to inhibit total evacuation of electrons from the central propagation channel reducing the radial ion acceleration associated with ponderomotive Coulomb explosion, a mechanism predominant in the long pulse scenario. New ion acceleration mechanism have been unveiled in this regime leading to non-Maxwellian quasi monoenergetic features in the ion energy spectra. The emitted nonthermal ion bunches show a new scaling of the ion peak energy with plasma density. The scaling identified in this new regime differs from previously reported studies.
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Affiliation(s)
- S Kahaly
- Laboratoire d'Optique Appliquée, Ecole Polytechnique, ENSTA, CNRS, UMR 7639, 91761 Palaiseau, France.,ELI-ALPS, ELI-Hu Nkft, Dugonics ter 13, Szeged 6720, Hungary
| | - F Sylla
- Laboratoire d'Optique Appliquée, Ecole Polytechnique, ENSTA, CNRS, UMR 7639, 91761 Palaiseau, France.,SourceLAB SAS, 86 rue de Paris, F-91400 Orsay, France
| | - A Lifschitz
- Laboratoire d'Optique Appliquée, Ecole Polytechnique, ENSTA, CNRS, UMR 7639, 91761 Palaiseau, France
| | - A Flacco
- Laboratoire d'Optique Appliquée, Ecole Polytechnique, ENSTA, CNRS, UMR 7639, 91761 Palaiseau, France
| | - M Veltcheva
- Laboratoire d'Optique Appliquée, Ecole Polytechnique, ENSTA, CNRS, UMR 7639, 91761 Palaiseau, France
| | - V Malka
- Laboratoire d'Optique Appliquée, Ecole Polytechnique, ENSTA, CNRS, UMR 7639, 91761 Palaiseau, France
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18
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Gu YJ, Klimo O, Kumar D, Liu Y, Singh SK, Esirkepov TZ, Bulanov SV, Weber S, Korn G. Fast magnetic-field annihilation in the relativistic collisionless regime driven by two ultrashort high-intensity laser pulses. Phys Rev E 2016; 93:013203. [PMID: 26871179 DOI: 10.1103/physreve.93.013203] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Indexed: 11/07/2022]
Abstract
The magnetic quadrupole structure formation during the interaction of two ultrashort high power laser pulses with a collisionless plasma is demonstrated with 2.5-dimensional particle-in-cell simulations. The subsequent expansion of the quadrupole is accompanied by magnetic-field annihilation in the ultrarelativistic regime, when the magnetic field cannot be sustained by the plasma current. This results in a dominant contribution of the displacement current exciting a strong large scale electric field. This field leads to the conversion of magnetic energy into kinetic energy of accelerated electrons inside the thin current sheet.
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Affiliation(s)
- Y J Gu
- Institute of Physics of the ASCR, ELI-Beamlines, Na Slovance 2, 18221 Prague, Czech Republic
| | - O Klimo
- Institute of Physics of the ASCR, ELI-Beamlines, Na Slovance 2, 18221 Prague, Czech Republic.,FNSPE, Czech Technical University in Prague, 11519 Prague, Czech Republic
| | - D Kumar
- Institute of Physics of the ASCR, ELI-Beamlines, Na Slovance 2, 18221 Prague, Czech Republic
| | - Y Liu
- Institute of Physics of the ASCR, ELI-Beamlines, Na Slovance 2, 18221 Prague, Czech Republic
| | - S K Singh
- Institute of Physics of the ASCR, ELI-Beamlines, Na Slovance 2, 18221 Prague, Czech Republic
| | - T Zh Esirkepov
- Kansai Photon Science Institute, Japan Atomic Energy Agency, 8-1-7 Umemidai, Kizugawa-shi, Kyoto 619-0215, Japan
| | - S V Bulanov
- Kansai Photon Science Institute, Japan Atomic Energy Agency, 8-1-7 Umemidai, Kizugawa-shi, Kyoto 619-0215, Japan
| | - S Weber
- Institute of Physics of the ASCR, ELI-Beamlines, Na Slovance 2, 18221 Prague, Czech Republic
| | - G Korn
- Institute of Physics of the ASCR, ELI-Beamlines, Na Slovance 2, 18221 Prague, Czech Republic
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19
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Shou Y, Lu H, Hu R, Lin C, Wang H, Zhou M, He X, Chen JE, Yan X. Near-diffraction-limited laser focusing with a near-critical density plasma lens. OPTICS LETTERS 2016; 41:139-142. [PMID: 26696178 DOI: 10.1364/ol.41.000139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this Letter, we investigate the feasibility of focusing relativistic laser pulses toward diffraction limit by near-critical density plasma lenses. A theoretical model is developed to estimate the focal length of the plasma lens. Particle-in-cell simulations with various pulse parameters, such as pulse duration, beam waist, and intensity, are performed to show the robustness of plasma lenses. The results prove that the near-critical density plasma lenses can be deployed to obtain higher laser peak intensities with sub-wavelength focal spots in experiments.
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20
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Palaniyappan S, Huang C, Gautier DC, Hamilton CE, Santiago MA, Kreuzer C, Sefkow AB, Shah RC, Fernández JC. Efficient quasi-monoenergetic ion beams from laser-driven relativistic plasmas. Nat Commun 2015; 6:10170. [PMID: 26657147 PMCID: PMC4682178 DOI: 10.1038/ncomms10170] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 11/10/2015] [Indexed: 11/09/2022] Open
Abstract
Table-top laser-plasma ion accelerators have many exciting applications, many of which require ion beams with simultaneous narrow energy spread and high conversion efficiency. However, achieving these requirements has been elusive. Here we report the experimental demonstration of laser-driven ion beams with narrow energy spread and energies up to 18 MeV per nucleon and ∼5% conversion efficiency (that is 4 J out of 80-J laser). Using computer simulations we identify a self-organizing scheme that reduces the ion energy spread after the laser exits the plasma through persisting self-generated plasma electric (∼10(12) V m(-1)) and magnetic (∼10(4) T) fields. These results contribute to the development of next generation compact accelerators suitable for many applications such as isochoric heating for ion-fast ignition and producing warm dense matter for basic science.
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Affiliation(s)
| | - Chengkun Huang
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Donald C Gautier
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | | | | | | | - Adam B Sefkow
- Sandia National Laboratory, Albuquerque, New Mexico 87185, USA
| | - Rahul C Shah
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Juan C Fernández
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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21
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Bulanov SS, Esarey E, Schroeder CB, Bulanov SV, Esirkepov TZ, Kando M, Pegoraro F, Leemans WP. Enhancement of maximum attainable ion energy in the radiation pressure acceleration regime using a guiding structure. PHYSICAL REVIEW LETTERS 2015; 114:105003. [PMID: 25815939 DOI: 10.1103/physrevlett.114.105003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Indexed: 06/04/2023]
Abstract
Radiation pressure acceleration is a highly efficient mechanism of laser-driven ion acceleration, with the laser energy almost totally transferrable to the ions in the relativistic regime. There is a fundamental limit on the maximum attainable ion energy, which is determined by the group velocity of the laser. In the case of tightly focused laser pulses, which are utilized to get the highest intensity, another factor limiting the maximum ion energy comes into play, the transverse expansion of the target. Transverse expansion makes the target transparent for radiation, thus reducing the effectiveness of acceleration. Utilization of an external guiding structure for the accelerating laser pulse may provide a way of compensating for the group velocity and transverse expansion effects.
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Affiliation(s)
- S S Bulanov
- University of California, Berkeley, California 94720, USA
| | - E Esarey
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - C B Schroeder
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - S V Bulanov
- Kansai Photon Science Institute, JAEA, Kizugawa, Kyoto 619-0215, Japan
- Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow 119991, Russia
- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russia
| | - T Zh Esirkepov
- Kansai Photon Science Institute, JAEA, Kizugawa, Kyoto 619-0215, Japan
| | - M Kando
- Kansai Photon Science Institute, JAEA, Kizugawa, Kyoto 619-0215, Japan
| | - F Pegoraro
- Physics Department, University of Pisa and Istituto Nazionale di Ottica, CNR, Pisa 56127, Italy
| | - W P Leemans
- University of California, Berkeley, California 94720, USA
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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22
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Ping YL, Zhong JY, Sheng ZM, Wang XG, Liu B, Li YT, Yan XQ, He XT, Zhang J, Zhao G. Three-dimensional fast magnetic reconnection driven by relativistic ultraintense femtosecond lasers. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:031101. [PMID: 24730781 DOI: 10.1103/physreve.89.031101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Indexed: 06/03/2023]
Abstract
Three-dimensional fast magnetic reconnection driven by two ultraintense femtosecond laser pulses is investigated by relativistic particle-in-cell simulation, where the two paralleled incident laser beams are shot into a near-critical plasma layer to form a magnetic reconnection configuration in self-generated magnetic fields. A reconnection X point and out-of-plane quadrupole field structures associated with magnetic reconnection are formed. The reconnection rate is found to be faster than that found in previous two-dimensional Hall magnetohydrodynamic simulations and electrostatic turbulence contribution to the reconnection electric field plays an essential role. Both in-plane and out-of-plane electron and ion accelerations up to a few MeV due to the magnetic reconnection process are also obtained.
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Affiliation(s)
- Y L Ping
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
| | - J Y Zhong
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
| | - Z M Sheng
- Key Laboratory for Laser Plasmas (MOE) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China and Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
| | - X G Wang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - B Liu
- Center for Applied Physics and Technology, Peking University, Beijing 100084, China
| | - Y T Li
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
| | - X Q Yan
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China and Center for Applied Physics and Technology, Peking University, Beijing 100084, China
| | - X T He
- Center for Applied Physics and Technology, Peking University, Beijing 100084, China
| | - J Zhang
- Key Laboratory for Laser Plasmas (MOE) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China and Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
| | - G Zhao
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
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23
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Abstract
PURPOSE This Monte Carlo simulation work aims at studying a new radiotherapy approach called proton-minibeam radiation therapy (pMBRT). The main objective of this proof of concept was the evaluation of the possible gain in tissue sparing, thanks to the spatial fractionation of the dose, which could be used to deposit higher and potentially curative doses in clinical cases where tissue tolerances are a limit for conventional methods. METHODS Monte Carlo simulations (GATE v.6) have been used as a method to calculate the ratio of the peak-to-valley doses (PVDR) for arrays of proton minibeams of 0.7 mm width and several center-to-center distances, at different depths in a water phantom. The beam penumbras were also evaluated as an important parameter for tissue sparing, for example, in the treatment of non-cancer diseases like epilepsy. Two proton energies were considered in this study: a clinically relevant energy (105 MeV) and a very high energy (1 GeV), to benefit from a reduced lateral scattering. For the latter case, an interlaced geometry was also evaluated. RESULTS Higher or similar PVDR than the ones obtained in x-rays minibeam radiation therapy were achieved in several pMBRT configurations. In addition, for the two energies studied, the beam penumbras are smaller than in the case of Gamma Knife radiosurgery. CONCLUSIONS The high PVDR obtained for some configurations and the small penumbras in comparison with existing radiosurgery techniques, suggest a potential gain in healthy tissue sparing in this new technique. Biological studies are warranted to assess the effects of pMBRT on both normal and tumoral tissues.
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Affiliation(s)
- Y Prezado
- IMNC-UMR 8165, CNRS, Paris 7 and Paris 11 Universities, Orsay, France.
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24
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Liu B, Wang HY, Liu J, Fu LB, Xu YJ, Yan XQ, He XT. Generating overcritical dense relativistic electron beams via self-matching resonance acceleration. PHYSICAL REVIEW LETTERS 2013; 110:045002. [PMID: 25166171 DOI: 10.1103/physrevlett.110.045002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Indexed: 06/03/2023]
Abstract
We show a novel self-matching resonance acceleration regime for generating dense relativistic electron beams by using ultraintense circularly polarized laser pulses in near-critical density plasmas. When the self-generated quasistatic axial magnetic field is strong enough to pinch and trap thermal relativistic electrons, an overdense electron bunch is formed in the center of the laser channel. In the trapping process, the electron betatron frequencies and phases can be adjusted automatically to match the resonance condition. The matched electrons are accelerated continuously and a collimated electron beam with overcritical density, helical structure, and plateau profile energy spectrum is hence generated.
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Affiliation(s)
- B Liu
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - H Y Wang
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - J Liu
- Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
| | - L B Fu
- Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
| | - Y J Xu
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - X Q Yan
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - X T He
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China and Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
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25
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Jolly SW, He Z, McGuffey C, Schumaker W, Krushelnick K, Thomas AGR. Stereolithography based method of creating custom gas density profile targets for high intensity laser-plasma experiments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:073503. [PMID: 22852691 DOI: 10.1063/1.4731782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Laser based stereolithography methods are shown to be useful for production of gas targets for high intensity laser-plasma interaction experiments. A cylindrically symmetric nozzle with an opening of approximately 100 μm and a periodic attachment of variable periodicity are outlined in detail with associated density profile characterization. Both components are durable within the limits of relevant experiments.
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Affiliation(s)
- S W Jolly
- Center for Ultrafast Optical Sciences, University of Michigan, Ann Arbor, Michigan 48105, USA
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26
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Nakamura T, Koga JK, Esirkepov TZ, Kando M, Korn G, Bulanov SV. High-power γ-ray flash generation in ultraintense laser-plasma interactions. PHYSICAL REVIEW LETTERS 2012; 108:195001. [PMID: 23003049 DOI: 10.1103/physrevlett.108.195001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Revised: 02/10/2012] [Indexed: 06/01/2023]
Abstract
When high-intensity laser interaction with matter enters the regime of dominated radiation reaction, the radiation losses open the way for producing short pulse high-power γ-ray flashes. The γ-ray pulse duration and divergence are determined by the laser pulse amplitude and by the plasma target density scale length. On the basis of theoretical analysis and particle-in-cell simulations with the radiation friction force incorporated, optimal conditions for generating a γ-ray flash with a tailored overcritical density target are found.
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Affiliation(s)
- Tatsufumi Nakamura
- Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizugawa, Kyoto, Japan 6190215
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27
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Daido H, Nishiuchi M, Pirozhkov AS. Review of laser-driven ion sources and their applications. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2012; 75:056401. [PMID: 22790586 DOI: 10.1088/0034-4885/75/5/056401] [Citation(s) in RCA: 181] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
For many years, laser-driven ion acceleration, mainly proton acceleration, has been proposed and a number of proof-of-principle experiments have been carried out with lasers whose pulse duration was in the nanosecond range. In the 1990s, ion acceleration in a relativistic plasma was demonstrated with ultra-short pulse lasers based on the chirped pulse amplification technique which can provide not only picosecond or femtosecond laser pulse duration, but simultaneously ultra-high peak power of terawatt to petawatt levels. Starting from the year 2000, several groups demonstrated low transverse emittance, tens of MeV proton beams with a conversion efficiency of up to several percent. The laser-accelerated particle beams have a duration of the order of a few picoseconds at the source, an ultra-high peak current and a broad energy spectrum, which make them suitable for many, including several unique, applications. This paper reviews, firstly, the historical background including the early laser-matter interaction studies on energetic ion acceleration relevant to inertial confinement fusion. Secondly, we describe several implemented and proposed mechanisms of proton and/or ion acceleration driven by ultra-short high-intensity lasers. We pay special attention to relatively simple models of several acceleration regimes. The models connect the laser, plasma and proton/ion beam parameters, predicting important features, such as energy spectral shape, optimum conditions and scalings under these conditions for maximum ion energy, conversion efficiency, etc. The models also suggest possible ways to manipulate the proton/ion beams by tailoring the target and irradiation conditions. Thirdly, we review experimental results on proton/ion acceleration, starting with the description of driving lasers. We list experimental results and show general trends of parameter dependences and compare them with the theoretical predictions and simulations. The fourth topic includes a review of scientific, industrial and medical applications of laser-driven proton or ion sources, some of which have already been established, while the others are yet to be demonstrated. In most applications, the laser-driven ion sources are complementary to the conventional accelerators, exhibiting significantly different properties. Finally, we summarize the paper.
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Affiliation(s)
- Hiroyuki Daido
- Applied Laser Technology Institute, Tsuruga Head Office, Japan Atomic Energy Agency, Kizaki, Tsuruga-shi, Fukui-ken 914-8585, Japan.
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28
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Pirozhkov AS, Kando M, Esirkepov TZ, Gallegos P, Ahmed H, Ragozin EN, Faenov AY, Pikuz TA, Kawachi T, Sagisaka A, Koga JK, Coury M, Green J, Foster P, Brenner C, Dromey B, Symes DR, Mori M, Kawase K, Kameshima T, Fukuda Y, Chen L, Daito I, Ogura K, Hayashi Y, Kotaki H, Kiriyama H, Okada H, Nishimori N, Imazono T, Kondo K, Kimura T, Tajima T, Daido H, Rajeev P, McKenna P, Borghesi M, Neely D, Kato Y, Bulanov SV. Soft-x-ray harmonic comb from relativistic electron spikes. PHYSICAL REVIEW LETTERS 2012; 108:135004. [PMID: 22540709 DOI: 10.1103/physrevlett.108.135004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2011] [Indexed: 05/31/2023]
Abstract
We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multiterawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving μJ/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by particle-in-cell simulations.
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Affiliation(s)
- A S Pirozhkov
- Advanced Beam Technology Division, JAEA, 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan
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29
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Sgattoni A, Londrillo P, Macchi A, Passoni M. Laser ion acceleration using a solid target coupled with a low-density layer. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:036405. [PMID: 22587194 DOI: 10.1103/physreve.85.036405] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Indexed: 05/31/2023]
Abstract
We investigate by particle-in-cell simulations in two and three dimensions the laser-plasma interaction and the proton acceleration in multilayer targets where a low-density ("near-critical") layer of a few-micron thickness is added on the illuminated side of a thin, high-density layer. This target design can be obtained by depositing a "foam" layer on a thin metallic foil. The presence of the near-critical plasma strongly increases both the conversion efficiency and the energy of electrons and leads to enhanced acceleration of protons from a rear side layer via the target normal sheath acceleration mechanism. The electrons of the foam are strongly accelerated in the forward direction and propagate on the rear side of the target, building up a high electric field with a relatively flat longitudinal profile. In these conditions the maximum proton energy is up to three times higher than in the case of the bare solid target.
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Affiliation(s)
- A Sgattoni
- Dipartimento di Energia, Politecnico di Milano, Via Ponzio 34/3, I-20133 Milan, Italy.
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30
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Wang HY, Lin C, Sheng ZM, Liu B, Zhao S, Guo ZY, Lu YR, He XT, Chen JE, Yan XQ. Laser shaping of a relativistic intense, short Gaussian pulse by a plasma lens. PHYSICAL REVIEW LETTERS 2011; 107:265002. [PMID: 22243161 DOI: 10.1103/physrevlett.107.265002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2011] [Indexed: 05/31/2023]
Abstract
By 3D particle-in-cell simulation and analysis, we propose a plasma lens to make high intensity, high contrast laser pulses with a steep front. When an intense, short Gaussian laser pulse of circular polarization propagates in near-critical plasma, it drives strong currents of relativistic electrons which magnetize the plasma. Three pulse shaping effects are synchronously observed when the laser passes through the plasma lens. The laser intensity is increased by more than 1 order of magnitude while the initial Gaussian profile undergoes self-modulation longitudinally and develops a steep front. Meanwhile, a nonrelativistic prepulse can be absorbed by the overcritical plasma lens, which can improve the laser contrast without affecting laser shaping of the main pulse. If the plasma skin length is properly chosen and kept fixed, the plasma lens can be used for varied laser intensity above 10(19) W/cm(2).
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Affiliation(s)
- H Y Wang
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
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31
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Nakamura T, Bulanov SV, Esirkepov TZ, Kando M. High-energy ions from near-critical density plasmas via magnetic vortex acceleration. PHYSICAL REVIEW LETTERS 2010; 105:135002. [PMID: 21230779 DOI: 10.1103/physrevlett.105.135002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Indexed: 05/30/2023]
Abstract
Ultraintense laser pulses propagating in near-critical density plasmas generate magnetic dipole vortex structures. In the region of decreasing plasma density, the vortex expands both in forward and lateral directions. The magnetic field pressure pushes electrons and ions to form a density jump along the vortex axis and induces a longitudinal electric field. This structure moves together with the expanding dipole vortex. The background ions located ahead of the electric field are accelerated to high energies. The energy scaling of ions generated by this magnetic vortex acceleration mechanism is derived and corroborated using particle-in-cell simulations.
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Affiliation(s)
- Tatsufumi Nakamura
- Advanced Photon Research Center, Japan Atomic Energy Agency, Kizugawa, Kyoto 619-0215, Japan.
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