1
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Lan Z, Arikawa Y, Mirfayzi SR, Morace A, Hayakawa T, Sato H, Kamiyama T, Wei T, Tatsumi Y, Koizumi M, Abe Y, Fujioka S, Mima K, Kodama R, Yogo A. Single-shot laser-driven neutron resonance spectroscopy for temperature profiling. Nat Commun 2024; 15:5365. [PMID: 38997259 PMCID: PMC11245602 DOI: 10.1038/s41467-024-49142-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Accepted: 05/23/2024] [Indexed: 07/14/2024] Open
Abstract
The temperature measurement of material inside of an object is one of the key technologies for control of dynamical processes. For this purpose, various techniques such as laser-based thermography and phase-contrast imaging thermography have been studied. However, it is, in principle, impossible to measure the temperature of an element inside of an object using these techniques. One of the possible solutions is measurements of Doppler brooding effect in neutron resonance absorption (NRA). Here we present a method to measure the temperature of an element or an isotope inside of an object using NRA with a single neutron pulse of approximately 100 ns width provided from a high-power laser. We demonstrate temperature measurements of a tantalum (Ta) metallic foil heated from the room temperature up to 617 K. Although the neutron energy resolution is fluctuated from shot to shot, we obtain the temperature dependence of resonance Doppler broadening using a reference of a silver (Ag) foil kept to the room temperature. A free gas model well reproduces the results. This method enables element(isotope)-sensitive thermometry to detect the instantaneous temperature rise in dynamical processes.
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Affiliation(s)
- Zechen Lan
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Yasunobu Arikawa
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | | | - Alessio Morace
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Takehito Hayakawa
- Kansai Institute for Photon Science, National Institutes for Quantum Science and Technology, Kizugawa, 619-0215, Japan
| | - Hirotaka Sato
- Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan
| | - Takashi Kamiyama
- Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan
| | - Tianyun Wei
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Yuta Tatsumi
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Mitsuo Koizumi
- Integrated Support Center for Nuclear Nonproliferation and Nuclear Security, Japan Atomic Energy Agency, Tokai, 319-1195, Japan
| | - Yuki Abe
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
- Graduate School of Engineering, Osaka University, Suita, 565-0871, Japan
| | - Shinsuke Fujioka
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Kunioki Mima
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Ryosuke Kodama
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Akifumi Yogo
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan.
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2
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Fetsch H, Fisch NJ. Improved ion heating in fast ignition by pulse shaping. Phys Rev E 2023; 108:045206. [PMID: 37978660 DOI: 10.1103/physreve.108.045206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 09/27/2023] [Indexed: 11/19/2023]
Abstract
The fast ignition paradigm for inertial fusion offers increased gain and tolerance of asymmetry by compressing fuel at low entropy and then quickly igniting a small region. Because this hot spot rapidly disassembles, the ions must be heated to ignition temperature as quickly as possible, but most ignitor designs directly heat electrons. A constant-power ignitor pulse, which is generally assumed, is suboptimal for coupling energy from electrons to ions. Using a simple model of a hot spot in isochoric plasma, a pulse shape to maximize ion heating is presented in analytical form. Bounds are derived on the maximum ion temperature attainable by electron heating only. Moreover, arranging for faster ion heating allows a smaller hot spot, improving fusion gain. Under representative conditions, the optimized pulse can reduce ignition energy by over 20%.
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Affiliation(s)
- Henry Fetsch
- Department of Astrophysical Sciences and Princeton University, Princeton, New Jersey 08540, USA
| | - Nathaniel J Fisch
- Department of Astrophysical Sciences and Princeton University, Princeton, New Jersey 08540, USA
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3
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Strehlow J, Kim J, Bailly-Grandvaux M, Bolaños S, Smith H, Haid A, Alfonso EL, Aniculaesei C, Chen H, Ditmire T, Donovan ME, Hansen SB, Hegelich BM, McLean HS, Quevedo HJ, Spinks MM, Beg FN. A laser parameter study on enhancing proton generation from microtube foil targets. Sci Rep 2022; 12:10827. [PMID: 35760862 PMCID: PMC9237049 DOI: 10.1038/s41598-022-14881-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 06/14/2022] [Indexed: 11/09/2022] Open
Abstract
The interaction of an intense laser with a solid foil target can drive [Formula: see text] TV/m electric fields, accelerating ions to MeV energies. In this study, we experimentally observe that structured targets can dramatically enhance proton acceleration in the target normal sheath acceleration regime. At the Texas Petawatt Laser facility, we compared proton acceleration from a [Formula: see text] flat Ag foil, to a fixed microtube structure 3D printed on the front side of the same foil type. A pulse length (140-450 fs) and intensity ((4-10) [Formula: see text] W/cm[Formula: see text]) study found an optimum laser configuration (140 fs, 4 [Formula: see text] W/cm[Formula: see text]), in which microtube targets increase the proton cutoff energy by 50% and the yield of highly energetic protons ([Formula: see text] MeV) by a factor of 8[Formula: see text]. When the laser intensity reaches [Formula: see text] W/cm[Formula: see text], the prepulse shutters the microtubes with an overcritical plasma, damping their performance. 2D particle-in-cell simulations are performed, with and without the preplasma profile imported, to better understand the coupling of laser energy to the microtube targets. The simulations are in qualitative agreement with the experimental results, and show that the prepulse is necessary to account for when the laser intensity is sufficiently high.
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Affiliation(s)
- Joseph Strehlow
- Center for Energy Research, University of California - San Diego, La Jolla, CA, 92093, USA.
| | - Joohwan Kim
- Center for Energy Research, University of California - San Diego, La Jolla, CA, 92093, USA
| | | | - Simon Bolaños
- Center for Energy Research, University of California - San Diego, La Jolla, CA, 92093, USA
| | - Herbie Smith
- Center for High Energy Density Science, University of Texas, Austin, TX, 78712, USA
| | - Alex Haid
- General Atomics, Inertial Fusion Technologies, San Diego, CA, 92121, USA
| | - Emmanuel L Alfonso
- General Atomics, Inertial Fusion Technologies, San Diego, CA, 92121, USA
| | | | - Hui Chen
- Lawrence Livermore National Laboratory, Livermore, California, 94550, USA
| | - Todd Ditmire
- Center for High Energy Density Science, University of Texas, Austin, TX, 78712, USA
| | - Michael E Donovan
- Center for High Energy Density Science, University of Texas, Austin, TX, 78712, USA
| | | | - Bjorn M Hegelich
- Center for High Energy Density Science, University of Texas, Austin, TX, 78712, USA
| | - Harry S McLean
- Lawrence Livermore National Laboratory, Livermore, California, 94550, USA
| | - Hernan J Quevedo
- Center for High Energy Density Science, University of Texas, Austin, TX, 78712, USA
| | - Michael M Spinks
- Center for High Energy Density Science, University of Texas, Austin, TX, 78712, USA
| | - Farhat N Beg
- Center for Energy Research, University of California - San Diego, La Jolla, CA, 92093, USA
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4
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Mima K, Yogo A, Mirfayzi SR, Lan Z, Arikawa Y, Abe Y, Nishimura H. Laser-driven neutron source and nuclear resonance absorption imaging at ILE, Osaka University: review. APPLIED OPTICS 2022; 61:2398-2405. [PMID: 35333259 DOI: 10.1364/ao.444628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 02/15/2022] [Indexed: 06/14/2023]
Abstract
Here, we present an overview on the recent progress in the development of the laser-driven neutron source (LDNS) and nuclear resonance absorption (NRA) imaging at the Institute of Laser Engineering (ILE), Osaka University. The LDNS is unique because the number of neutrons per micro pulse is very large, and the source size and the pulse width are small. Consequently, extensive research and development of LDNSs is going on around the world. In this paper, a typical neutron generation process by the laser-driven ion beam, called the pitcher-catcher scheme, is described. The characteristics of the LDNS are compared with those of the accelerator-driven neutron source (ADNS), and unique application of the LDNS, such as NRA imaging, is presented. In the LDNS, NRA imaging is possible with a relatively short beam line in comparison with that of the ADNS since the neutron pulse width and the source size of the LDNS are small. Future prospects in research and development of NRA imaging with the LDNS at ILE Osaka University are also described.
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Abstract
The characteristics of nonstatic quantum light waves in the coherent state in a static environment is investigated. It is shown that the shape of the wave varies periodically as a manifestation of its peculiar properties of nonstaticity like the case of the Fock-state analysis for a nonstatic wave. A belly occurs in the graphic of wave evolution whenever the wave is maximally displaced in the quadrature space, whereas a node takes place every time the wave passes the equilibrium point during its oscillation. In this way, a belly and a node appear in turn successively. Whereas this change of wave profile is accompanied by the periodic variation of electric and magnetic energies, the total energy is conserved. The fluctuations of quadratures also vary in a regular manner according to the wave transformation in time. While the resultant time-varying uncertainty product is always larger than (or, at least, equal to) its quantum-mechanically allowed minimal value ([Formula: see text]), it is smallest whenever the wave constitutes a belly or a node. The mechanism underlying the abnormal features of nonstatic light waves demonstrated here can be interpreted by the rotation of the squeezed-shape contour of the Wigner distribution function in phase space.
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6
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Proof-of-principle experiment for laser-driven cold neutron source. Sci Rep 2020; 10:20157. [PMID: 33214592 PMCID: PMC7677543 DOI: 10.1038/s41598-020-77086-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 10/27/2020] [Indexed: 11/26/2022] Open
Abstract
The scientific and technical advances continue to support novel discoveries by allowing scientists to acquire new insights into the structure and properties of matter using new tools and sources. Notably, neutrons are among the most valuable sources in providing such a capability. At the Institute of Laser Engineering, Osaka, the first steps are taken towards the development of a table-top laser-driven neutron source, capable of producing a wide range of energies with high brightness and temporal resolution. By employing a pure hydrogen moderator, maintained at cryogenic temperature, a cold neutron (\documentclass[12pt]{minimal}
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\begin{document}$$\le 25\hbox { meV}$$\end{document}≤25meV) flux of \documentclass[12pt]{minimal}
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\begin{document}$$\sim 2\times 10^3\hbox { n/cm}^2$$\end{document}∼2×103n/cm2/pulse was measured at the proximity of the moderator exit surface. The beam duration of hundreds of ns to tens of \documentclass[12pt]{minimal}
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\begin{document}$$\upmu \hbox {s}$$\end{document}μs is evaluated for neutron energies ranging from 100s keV down to meV via Monte-Carlo techniques. Presently, with the upcoming J-EPoCH high repetition rate laser at Osaka University, a cold neutron flux in orders of \documentclass[12pt]{minimal}
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\begin{document}$$\sim 1\times 10^{9}\hbox { n/cm}^2/\hbox {s}$$\end{document}∼1×109n/cm2/s is expected to be delivered at the moderator in a compact beamline.
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7
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Curry CB, Dunning CAS, Gauthier M, Chou HGJ, Fiuza F, Glenn GD, Tsui YY, Bazalova-Carter M, Glenzer SH. Optimization of radiochromic film stacks to diagnose high-flux laser-accelerated proton beams. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:093303. [PMID: 33003776 DOI: 10.1063/5.0020568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 08/26/2020] [Indexed: 06/11/2023]
Abstract
Here, we extend flatbed scanner calibrations of GafChromic EBT3, MD-V3, and HD-V2 radiochromic films using high-precision x-ray irradiation and monoenergetic proton bombardment. By computing a visibility parameter based on fractional errors, optimal dose ranges and transitions between film types are identified. The visibility analysis is used to design an ideal radiochromic film stack for the proton energy spectrum expected from the interaction of a petawatt laser with a cryogenic hydrogen jet target.
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Affiliation(s)
- C B Curry
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - C A S Dunning
- Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - M Gauthier
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - H-G J Chou
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - F Fiuza
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - G D Glenn
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Y Y Tsui
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - M Bazalova-Carter
- Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - S H Glenzer
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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8
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Williams GJ, Link A, Sherlock M, Alessi DA, Bowers M, Conder A, Di Nicola P, Fiksel G, Fiuza F, Hamamoto M, Hermann MR, Herriot S, Homoelle D, Hsing W, d'Humières E, Kalantar D, Kemp A, Kerr S, Kim J, LaFortune KN, Lawson J, Lowe-Webb R, Ma T, Mariscal DA, Martinez D, Manuel MJE, Nakai M, Pelz L, Prantil M, Remington B, Sigurdsson R, Widmayer C, Williams W, Willingale L, Zacharias R, Youngblood K, Chen H. Production of relativistic electrons at subrelativistic laser intensities. Phys Rev E 2020; 101:031201. [PMID: 32289929 DOI: 10.1103/physreve.101.031201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 02/06/2020] [Indexed: 06/11/2023]
Abstract
Relativistic electron temperatures were measured from kilojoule, subrelativistic laser-plasma interactions. Experiments show an order of magnitude higher temperatures than expected from a ponderomotive scaling, where temperatures of up to 2.2 MeV were generated using an intensity of 1×10^{18}W/cm^{2}. Two-dimensional particle-in-cell simulations suggest that electrons gain superponderomotive energies by stochastic acceleration as they sample a large area of rapidly changing laser phase. We demonstrate that such high temperatures are possible from subrelativistic intensities by using lasers with long pulse durations and large spatial scales.
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Affiliation(s)
- G J Williams
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Link
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Sherlock
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D A Alessi
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Bowers
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Conder
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Di Nicola
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Fiksel
- Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - F Fiuza
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M Hamamoto
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M R Hermann
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Herriot
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Homoelle
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - W Hsing
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | | | - D Kalantar
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Kemp
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Kerr
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Kim
- Center for Energy Research, University of California, San Diego, California 92093, USA
| | - K N LaFortune
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Lawson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Lowe-Webb
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D A Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Martinez
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M J-E Manuel
- General Atomics, San Diego, California 92186, USA
| | - M Nakai
- Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - L Pelz
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Prantil
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Remington
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Sigurdsson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Widmayer
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - W Williams
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L Willingale
- Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - R Zacharias
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Youngblood
- General Atomics, San Diego, California 92186, USA
| | - Hui Chen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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9
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Morace A, Iwata N, Sentoku Y, Mima K, Arikawa Y, Yogo A, Andreev A, Tosaki S, Vaisseau X, Abe Y, Kojima S, Sakata S, Hata M, Lee S, Matsuo K, Kamitsukasa N, Norimatsu T, Kawanaka J, Tokita S, Miyanaga N, Shiraga H, Sakawa Y, Nakai M, Nishimura H, Azechi H, Fujioka S, Kodama R. Enhancing laser beam performance by interfering intense laser beamlets. Nat Commun 2019; 10:2995. [PMID: 31278266 PMCID: PMC6611939 DOI: 10.1038/s41467-019-10997-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 05/21/2019] [Indexed: 11/12/2022] Open
Abstract
Increasing the laser energy absorption into energetic particle beams represents a longstanding quest in intense laser-plasma physics. During the interaction with matter, part of the laser energy is converted into relativistic electron beams, which are the origin of secondary sources of energetic ions, γ-rays and neutrons. Here we experimentally demonstrate that using multiple coherent laser beamlets spatially and temporally overlapped, thus producing an interference pattern in the laser focus, significantly improves the laser energy conversion efficiency into hot electrons, compared to one beam with the same energy and nominal intensity as the four beamlets combined. Two-dimensional particle-in-cell simulations support the experimental results, suggesting that beamlet interference pattern induces a periodical shaping of the critical density, ultimately playing a key-role in enhancing the laser-to-electron energy conversion efficiency. This method is rather insensitive to laser pulse contrast and duration, making this approach robust and suitable to many existing facilities. Enhanced coupling of laser energy to the target particles is a fundamental issue in laser-plasma interactions. Here the authors demonstrate increased photon absorption leading into higher laser to electron and proton energy transfer through the interference of multiple coherent beamlets.
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Affiliation(s)
- A Morace
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan.
| | - N Iwata
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Y Sentoku
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - K Mima
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Y Arikawa
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - A Yogo
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - A Andreev
- Max Born Institute for non-linear optics and short pulse spectroscopy, Berlin, 12489, Germany.,St. Petersburg State University, Sankt-Petersburg, 199034, Russia
| | - S Tosaki
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - X Vaisseau
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Y Abe
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - S Kojima
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - S Sakata
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - M Hata
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - S Lee
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - K Matsuo
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - N Kamitsukasa
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - T Norimatsu
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - J Kawanaka
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - S Tokita
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - N Miyanaga
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - H Shiraga
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - Y Sakawa
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - M Nakai
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - H Nishimura
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - H Azechi
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - S Fujioka
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
| | - R Kodama
- Institute of Laser Engineering, Osaka University, Suita, 565-0871, Japan
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10
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Iwata N, Kojima S, Sentoku Y, Hata M, Mima K. Plasma density limits for hole boring by intense laser pulses. Nat Commun 2018; 9:623. [PMID: 29434203 PMCID: PMC5809619 DOI: 10.1038/s41467-018-02829-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 01/03/2018] [Indexed: 11/09/2022] Open
Abstract
High-power lasers in the relativistic intensity regime with multi-picosecond pulse durations are available in many laboratories around the world. Laser pulses at these intensities reach giga-bar level radiation pressures, which can push the plasma critical surface where laser light is reflected. This process is referred to as the laser hole boring (HB), which is critical for plasma heating, hence essential for laser-based applications. Here we derive the limit density for HB, which is the maximum plasma density the laser can reach, as a function of laser intensity. The time scale for when the laser pulse reaches the limit density is also derived. These theories are confirmed by a series of particle-in-cell simulations. After reaching the limit density, the plasma starts to blowout back toward the laser, and is accompanied by copious superthermal electrons; therefore, the electron energy can be determined by varying the laser pulse length.
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Affiliation(s)
- Natsumi Iwata
- Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Sadaoki Kojima
- Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Advanced Research Center for Beam Science, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
| | - Yasuhiko Sentoku
- Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Masayasu Hata
- Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kunioki Mima
- The Graduate School for the Creation of New Photon Industries, 1955-1 Kurematsu, Nishiku, Hamamatsu, Shizuoka, 141-1201, Japan
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11
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Zhang H, Shen BF, Wang WP, Zhai SH, Li SS, Lu XM, Li JF, Xu RJ, Wang XL, Liang XY, Leng YX, Li RX, Xu ZZ. Collisionless Shock Acceleration of High-Flux Quasimonoenergetic Proton Beams Driven by Circularly Polarized Laser Pulses. PHYSICAL REVIEW LETTERS 2017; 119:164801. [PMID: 29099228 DOI: 10.1103/physrevlett.119.164801] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Indexed: 06/07/2023]
Abstract
We present experimental studies on ion acceleration using an 800-nm circularly polarized laser pulse with a peak intensity of 6.9×10^{19} W/cm^{2} interacting with an overdense plasma that is produced by a laser prepulse ionizing an initially ultrathin plastic foil. The proton spectra exhibit spectral peaks at energies up to 9 MeV with energy spreads of 30% and fluxes as high as 3×10^{12} protons/MeV/sr. Two-dimensional particle-in-cell simulations reveal that collisionless shocks are efficiently launched by circularly polarized lasers in exploded plasmas, resulting in the acceleration of quasimonoenergetic proton beams. Furthermore, this scheme predicts the generation of quasimonoenergetic proton beams with peak energies of approximately 150 MeV using current laser technology, representing a significant step toward applications such as proton therapy.
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Affiliation(s)
- H Zhang
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - B F Shen
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
- Department of Physics, Shanghai Normal University, Shanghai 200234, China
- Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
| | - W P Wang
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - S H Zhai
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - S S Li
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - X M Lu
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - J F Li
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - R J Xu
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - X L Wang
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - X Y Liang
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Y X Leng
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
| | - R X Li
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
- Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Z Z Xu
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
- Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
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