1
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Valenta P, Maslarova D, Babjak R, Martinez B, Bulanov SV, Vranić M. Direct laser acceleration: A model for the electron injection from the walls of a cylindrical guiding structure. Phys Rev E 2024; 109:065204. [PMID: 39020949 DOI: 10.1103/physreve.109.065204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Accepted: 05/08/2024] [Indexed: 07/20/2024]
Abstract
We use analytical methods and particle-in-cell simulation to investigate the origin of electrons accelerated by the process of direct laser acceleration driven by high-power laser pulses in preformed narrow cylindrical plasma channels. The simulation shows that the majority of accelerated electrons are originally located along the interface between the channel wall and the channel interior. The analytical model based on the electron hydrodynamics illustrates the underlying physical mechanism of the release of electrons from the channel wall when irradiated by an intense laser, the subsequent electron dynamics, and the corresponding evolution of the channel density profile. The quantitative predictions of the total charge of released electrons and the average electron density inside the channel are validated by comparison with the simulation results.
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2
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Al-Naseri H, Brodin G. Radiation reaction effects in relativistic plasmas: The electrostatic limit. Phys Rev E 2023; 107:035203. [PMID: 37072971 DOI: 10.1103/physreve.107.035203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 02/28/2023] [Indexed: 04/20/2023]
Abstract
We study the evolution of electrostatic plasma waves, using the relativistic Vlasov equation extended by the Landau-Lifshitz radiation reaction, accounting for the back-reaction due to the emission of single particle Larmor radiation. In particular, the Langmuir wave damping is calculated as a function of wave number, initial temperature, and initial electric field amplitude. Moreover, the background distribution function loses energy in the process, and we calculate the cooling rate as a function of initial temperature and initial wave amplitude. Finally, we investigate how the relative magnitude of wave damping and background cooling varies with the initial parameters. In particular, it is found that the relative contribution to the energy loss associated with background cooling decreases slowly with the initial wave amplitude.
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Affiliation(s)
| | - Gert Brodin
- Department of Physics, Umeå University, SE-901 87 Umeå, Sweden
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3
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Torgrimsson G. Resummation of Quantum Radiation Reaction in Plane Waves. PHYSICAL REVIEW LETTERS 2021; 127:111602. [PMID: 34558954 DOI: 10.1103/physrevlett.127.111602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 06/03/2021] [Accepted: 08/06/2021] [Indexed: 06/13/2023]
Abstract
We propose a new approach to obtain the momentum expectation value of an electron in a high-intensity laser, including multiple photon emissions and loops. We find a recursive formula that allows us to obtain the O(α^{n}) term from O(α^{n-1}), which can also be expressed as an integro-differential equation. In the classical limit we obtain the solution to the Landau-Lifshitz equation to all orders. We show how spin-dependent quantum radiation reaction can be obtained by resumming both the energy expansion as well as the α expansion.
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Affiliation(s)
- Greger Torgrimsson
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
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4
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Heinzl T, Ilderton A, King B. Classical Resummation and Breakdown of Strong-Field QED. PHYSICAL REVIEW LETTERS 2021; 127:061601. [PMID: 34420332 DOI: 10.1103/physrevlett.127.061601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 05/11/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
QED perturbation theory has been conjectured to break down in sufficiently strong backgrounds, obstructing the analysis of strong-field physics. We show that the breakdown occurs even in classical electrodynamics, at lower field strengths than previously considered, and that it may be cured by resummation. As a consequence, an analogous resummation is required in QED. A detailed investigation shows, for a range of observables, that unitarity removes diagrams previously believed to be responsible for the breakdown of QED perturbation theory.
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Affiliation(s)
- T Heinzl
- Centre for Mathematical Sciences, University of Plymouth, Plymouth PL4 8AA, United Kingdom
| | - A Ilderton
- Centre for Mathematical Sciences, University of Plymouth, Plymouth PL4 8AA, United Kingdom
| | - B King
- Centre for Mathematical Sciences, University of Plymouth, Plymouth PL4 8AA, United Kingdom
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5
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Abstract
The equation of motion for a radiating charged particle is known as the Lorentz–Abraham–Dirac (LAD) equation. The radiation reaction force in the LAD equation contains a third time-derivative term, called the Schott term, which leads to a runaway solution and a pre-acceleration solution. Since the Schott energy is the field energy confined to an area close to the particle and reversibly exchanged between particle and fields, the question of how it affects particle motion is of interest. In here we have obtained solutions for the LAD equation with and without the Schott term, and have compared them quantitatively. We have shown that the relative difference between the two solutions is quite small in the classical radiation reaction dominated regime.
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6
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Nakamura T. Stationary solutions of equations of motion for a radiating charged particle including a radiation reaction effect. Phys Rev E 2020; 102:033210. [PMID: 33075999 DOI: 10.1103/physreve.102.033210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 09/15/2020] [Indexed: 11/07/2022]
Abstract
For a radiating charged particle, the radiation reaction force plays an important role in determining its motion. Several formulas have been proposed to describe the radiation reaction force. Stationary solutions of the Lorentz-Abraham-Dirac (LAD), Mo-Papas, Landau-Lifshitz, and Ford-O'Connell equations are obtained and compared for a charged particle under a static magnetic and a rotating electric field. The behaviors of the obtained solutions look quite similar. The relative differences of the Lorentz factor, calculating the values using the LAD equation compared to the other equations, are evaluated; these values are shown to be less than 10^{-6} in the regime where classical radiation reactions are applicable.
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7
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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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8
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Magnusson J, Gonoskov A, Marklund M, Esirkepov TZ, Koga JK, Kondo K, Kando M, Bulanov SV, Korn G, Bulanov SS. Laser-Particle Collider for Multi-GeV Photon Production. PHYSICAL REVIEW LETTERS 2019; 122:254801. [PMID: 31347867 DOI: 10.1103/physrevlett.122.254801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Indexed: 06/10/2023]
Abstract
As an alternative to Compton backscattering and bremsstrahlung, the process of colliding high-energy electron beams with strong laser fields can more efficiently provide both a cleaner and brighter source of photons in the multi-GeV range for fundamental studies in nuclear and quark-gluon physics. In order to favor the emission of high-energy quanta and minimize their decay into electron-positron pairs, the fields must not only be sufficiently strong, but also well localized. We here examine these aspects and develop the concept of a laser-particle collider tailored for high-energy photon generation. We show that the use of multiple colliding laser pulses with 0.4 PW of total power is capable of converting more than 18% of multi-GeV electrons passing through the high-field region into photons, each of which carries more than half of the electron initial energy.
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Affiliation(s)
- J Magnusson
- Department of Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
| | - A Gonoskov
- Department of Physics, University of Gothenburg, SE-41296 Gothenburg, Sweden
- Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia
- Lobachevsky State University of Nizhni Novgorod, Nizhny Novgorod, 603950, Russia
| | - M Marklund
- Department of Physics, University of Gothenburg, SE-41296 Gothenburg, Sweden
| | - T Zh Esirkepov
- Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan
| | - J K Koga
- Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan
| | - K Kondo
- Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan
| | - M Kando
- Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan
| | - S V Bulanov
- Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan
- Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic
- Prokhorov General Physics Institute RAS, Vavilov street 38, Moscow 119991, Russia
| | - G Korn
- Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic
| | - S S Bulanov
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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9
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Capdessus R, King M, Del Sorbo D, Duff M, Ridgers CP, McKenna P. Relativistic Doppler-boosted γ-rays in High Fields. Sci Rep 2018; 8:9155. [PMID: 29904181 PMCID: PMC6002516 DOI: 10.1038/s41598-018-27122-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 05/24/2018] [Indexed: 12/05/2022] Open
Abstract
The relativistic Doppler effect is one of the most famous implications of the principles of special relativity and is intrinsic to moving radiation sources, relativistic optics and many astrophysical phenomena. It occurs in the case of a plasma sail accelerated to relativistic velocities by an external driver, such as an ultra-intense laser pulse. Here we show that the relativistic Doppler effect on the high energy synchrotron photon emission (~10 MeV), strongly depends on two intrinsic properties of the plasma (charge state and ion mass) and the transverse extent of the driver. When the moving plasma becomes relativistically transparent to the driver, we show that the γ-ray emission is Doppler-boosted and the angular emission decreases; optimal for the highest charge-to-mass ratio ion species (i.e. a hydrogen plasma). This provides new fundamental insight into the generation of γ-rays in extreme conditions and informs related experiments using multi-petawatt laser facilities.
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Affiliation(s)
- Remi Capdessus
- SUPA Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK.
| | - Martin King
- SUPA Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK
| | - Dario Del Sorbo
- York Plasma Institute, Department of Physics, University of York, York, YO10 5DQ, UK
| | - Matthew Duff
- SUPA Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK
| | - Christopher P Ridgers
- York Plasma Institute, Department of Physics, University of York, York, YO10 5DQ, UK
| | - Paul McKenna
- SUPA Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK.
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10
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Niel F, Riconda C, Amiranoff F, Duclous R, Grech M. From quantum to classical modeling of radiation reaction: A focus on stochasticity effects. Phys Rev E 2018; 97:043209. [PMID: 29758698 DOI: 10.1103/physreve.97.043209] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Indexed: 06/08/2023]
Abstract
Radiation reaction in the interaction of ultrarelativistic electrons with a strong external electromagnetic field is investigated using a kinetic approach in the nonlinear moderately quantum regime. Three complementary descriptions are discussed considering arbitrary geometries of interaction: a deterministic one relying on the quantum-corrected radiation reaction force in the Landau and Lifschitz (LL) form, a linear Boltzmann equation for the electron distribution function, and a Fokker-Planck (FP) expansion in the limit where the emitted photon energies are small with respect to that of the emitting electrons. The latter description is equivalent to a stochastic differential equation where the effect of the radiation reaction appears in the form of the deterministic term corresponding to the quantum-corrected LL friction force, and by a diffusion term accounting for the stochastic nature of photon emission. By studying the evolution of the energy moments of the electron distribution function with the three models, we are able to show that all three descriptions provide similar predictions on the temporal evolution of the average energy of an electron population in various physical situations of interest, even for large values of the quantum parameter χ. The FP and full linear Boltzmann descriptions also allow us to correctly describe the evolution of the energy variance (second-order moment) of the distribution function, while higher-order moments are in general correctly captured with the full linear Boltzmann description only. A general criterion for the limit of validity of each description is proposed, as well as a numerical scheme for the inclusion of the FP description in particle-in-cell codes. This work, not limited to the configuration of a monoenergetic electron beam colliding with a laser pulse, allows further insight into the relative importance of various effects of radiation reaction and in particular of the discrete and stochastic nature of high-energy photon emission and its back-reaction in the deformation of the particle distribution function.
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Affiliation(s)
- F Niel
- LULI, UPMC Université Paris 06: Sorbonne Universités, CNRS, École Polytechnique, CEA, Université Paris-Saclay, F-75252 Paris cedex 05, France
| | - C Riconda
- LULI, UPMC Université Paris 06: Sorbonne Universités, CNRS, École Polytechnique, CEA, Université Paris-Saclay, F-75252 Paris cedex 05, France
| | - F Amiranoff
- LULI, UPMC Université Paris 06: Sorbonne Universités, CNRS, École Polytechnique, CEA, Université Paris-Saclay, F-75252 Paris cedex 05, France
| | - R Duclous
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - M Grech
- LULI, CNRS, École Polytechnique, CEA, Université Paris-Saclay, UPMC Université Paris 06: Sorbonne Universités, F-91128 Palaiseau cedex, France
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11
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Heinzl T, Harvey C, Ilderton A, Marklund M, Bulanov SS, Rykovanov S, Schroeder CB, Esarey E, Leemans WP. Detecting radiation reaction at moderate laser intensities. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 91:023207. [PMID: 25768626 DOI: 10.1103/physreve.91.023207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Indexed: 06/04/2023]
Abstract
We propose a new method of detecting radiation reaction effects in the motion of particles subjected to laser pulses of moderate intensity and long duration. The effect becomes sizable for particles that gain almost no energy through the interaction with the laser pulse. Hence, there are regions of parameter space in which radiation reaction is actually the dominant influence on charged particle motion.
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Affiliation(s)
- Thomas Heinzl
- School of Computing and Mathematics, Plymouth University, Plymouth PL4 8AA, United Kingdom
| | - Chris Harvey
- Centre for Plasma Physics, Queen's University Belfast, BT7 1NN, United Kingdom
- Department of Applied Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
| | - Anton Ilderton
- Department of Applied Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
| | - Mattias Marklund
- Department of Applied Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
- Department of Physics, Umeå University, SE-901 87 Umeå, Sweden
| | | | - Sergey Rykovanov
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Carl B Schroeder
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Eric Esarey
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Wim P Leemans
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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12
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Li JX, Hatsagortsyan KZ, Keitel CH. Robust signatures of quantum radiation reaction in focused ultrashort laser pulses. PHYSICAL REVIEW LETTERS 2014; 113:044801. [PMID: 25105623 DOI: 10.1103/physrevlett.113.044801] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Indexed: 06/03/2023]
Abstract
Radiation-reaction effects in the interaction of an electron bunch with a superstrong focused ultrashort laser pulse are investigated in the quantum radiation-dominated regime. The angle-resolved Compton scattering spectra are calculated in laser pulses of variable duration using a semiclassical description for the radiation-dominated dynamics and a full quantum treatment for the emitted radiation. In dependence of the laser-pulse duration we find signatures of quantum radiation reaction in the radiation spectra, which are characteristic for the focused laser beam and visible in the qualitative behavior of both the angular spread and the spectral bandwidth of the radiation spectra. The signatures are robust with respect to the variation of the electron and laser-beam parameters in a large range. Qualitatively, they differ fully from those in the classical radiation-reaction regime and are measurable with presently available laser technology.
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Affiliation(s)
- Jian-Xing Li
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69029 Heidelberg, Germany
| | | | - Christoph H Keitel
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69029 Heidelberg, Germany
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13
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Steane AM. The fields and self-force of a constantly accelerating spherical shell. Proc Math Phys Eng Sci 2014. [DOI: 10.1098/rspa.2013.0480] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We present a partial differential equation describing the electromagnetic potentials around a charge distribution undergoing rigid motion at constant proper acceleration, and obtain a set of solutions to this equation. These solutions are used to find the self-force exactly in a chosen case. The electromagnetic self-force for a spherical shell of charge of proper radius
R
undergoing rigid motion at constant proper acceleration
a
0
is, to high-order approximation,
, and this is conjectured to be exact.
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Affiliation(s)
- Andrew M. Steane
- Department of Atomic and Laser Physics, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK
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14
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Kravets Y, Noble A, Jaroszynski D. Radiation reaction effects on the interaction of an electron with an intense laser pulse. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:011201. [PMID: 23944406 DOI: 10.1103/physreve.88.011201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Indexed: 06/02/2023]
Abstract
Radiation reaction effects will play an important role in near-future laser facilities, yet their theoretical description remains obscure. We explore the Ford-O'Connell equation for radiation reaction, and discuss its relation to other commonly used treatments. By analyzing the interaction of a high energy electron in an intense laser pulse, we find that radiation reaction effects prevent the particle from accessing a regime in which the Landau-Lifshitz approximation breaks down.
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Affiliation(s)
- Yevgen Kravets
- Department of Physics, SUPA and University of Strathclyde, Glasgow, G4 0NG, United Kingdom
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15
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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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16
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Lehmann G, Spatschek KH. Phase-space contraction and attractors for ultrarelativistic electrons. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:056412. [PMID: 23004884 DOI: 10.1103/physreve.85.056412] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 04/11/2012] [Indexed: 06/01/2023]
Abstract
Ultrashort-pulse laser intensities can reach 10(22) W/cm(2). In this case the electron motion becomes ultrarelativistic and significant bremsstrahlung occurs. The radiation causes a dissipative effect, which is called a radiation reaction. It has been shown in the literature that the radiation reaction force causes phase-space contraction when the motion of electrons in a laser field is considered. The effect of the radiation reaction force is smaller for electron propagation in the direction of a propagating plane wave compared to counterpropagation. In the case of two colliding laser beams with sufficiently large amplitudes, stochastic heating is an important process that will be influenced by the radiation reaction. It is shown here that the radiation reaction causes attractors and in certain parameter regimes electron motion converges to regular attractors. This causes a significant reduction of stochastic heating. The forms of the attractors are presented. The results confirm the general prediction of phase-space contraction and provide quantitative results for the speed of contraction as well as the type of attracted motion.
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Affiliation(s)
- G Lehmann
- Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf, Germany
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