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Title: Radiation pressure acceleration: The factors limiting maximum attainable ion energy

Abstract

Radiation pressure acceleration (RPA) is a highly efficient mechanism of laser-driven ion acceleration, with near complete transfer of the laser energy to the ions in the relativistic regime. However, there is a fundamental limit on the maximum attainable ion energy, which is determined by the group velocity of the laser. The tightly focused laser pulses have group velocities smaller than the vacuum light speed, and, since they offer the high intensity needed for the RPA regime, it is plausible that group velocity effects would manifest themselves in the experiments involving tightly focused pulses and thin foils. However, in this case, finite spot size effects are important, and another limiting factor, the transverse expansion of the target, may dominate over the group velocity effect. As the laser pulse diffracts after passing the focus, the target expands accordingly due to the transverse intensity profile of the laser. Due to this expansion, the areal density of the target decreases, making it transparent for radiation and effectively terminating the acceleration. The off-normal incidence of the laser on the target, due either to the experimental setup, or to the deformation of the target, will also lead to establishing a limit on maximum ion energy.

Authors:
 [1];  [1];  [1];  [2];  [3];  [3]; ORCiD logo [4];  [5]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. National Institutes for Quantum and Radiological Science and Technology, Kyoto (Japan); A. M. Prokhorov Institute of General Physics RAS, Moscow (Russia)
  3. National Institutes for Quantum and Radiological Science and Technology, Kyoto (Japan)
  4. Univ. of Pisa and Istituto Nazionale di Ottica, Pisa (Italy)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1379314
Alternate Identifier(s):
OSTI ID: 1247891
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Bulanov, S. S., Esarey, E., Schroeder, C. B., Bulanov, S. V., Esirkepov, T. Zh., Kando, M., Pegoraro, F., and Leemans, W. P. Radiation pressure acceleration: The factors limiting maximum attainable ion energy. United States: N. p., 2016. Web. doi:10.1063/1.4946025.
Bulanov, S. S., Esarey, E., Schroeder, C. B., Bulanov, S. V., Esirkepov, T. Zh., Kando, M., Pegoraro, F., & Leemans, W. P. Radiation pressure acceleration: The factors limiting maximum attainable ion energy. United States. doi:10.1063/1.4946025.
Bulanov, S. S., Esarey, E., Schroeder, C. B., Bulanov, S. V., Esirkepov, T. Zh., Kando, M., Pegoraro, F., and Leemans, W. P. Fri . "Radiation pressure acceleration: The factors limiting maximum attainable ion energy". United States. doi:10.1063/1.4946025. https://www.osti.gov/servlets/purl/1379314.
@article{osti_1379314,
title = {Radiation pressure acceleration: The factors limiting maximum attainable ion energy},
author = {Bulanov, S. S. and Esarey, E. and Schroeder, C. B. and Bulanov, S. V. and Esirkepov, T. Zh. and Kando, M. and Pegoraro, F. and Leemans, W. P.},
abstractNote = {Radiation pressure acceleration (RPA) is a highly efficient mechanism of laser-driven ion acceleration, with near complete transfer of the laser energy to the ions in the relativistic regime. However, there is a fundamental limit on the maximum attainable ion energy, which is determined by the group velocity of the laser. The tightly focused laser pulses have group velocities smaller than the vacuum light speed, and, since they offer the high intensity needed for the RPA regime, it is plausible that group velocity effects would manifest themselves in the experiments involving tightly focused pulses and thin foils. However, in this case, finite spot size effects are important, and another limiting factor, the transverse expansion of the target, may dominate over the group velocity effect. As the laser pulse diffracts after passing the focus, the target expands accordingly due to the transverse intensity profile of the laser. Due to this expansion, the areal density of the target decreases, making it transparent for radiation and effectively terminating the acceleration. The off-normal incidence of the laser on the target, due either to the experimental setup, or to the deformation of the target, will also lead to establishing a limit on maximum ion energy.},
doi = {10.1063/1.4946025},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {4}
}

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