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

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4946025· OSTI ID:1379314
 [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)

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1379314
Alternate ID(s):
OSTI ID: 1247891
Journal Information:
Physics of Plasmas, Vol. 23, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 42 works
Citation information provided by
Web of Science

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Improvement of laser-driven proton beam quality by optimized intense chirped laser pulses journal January 2018
Tailored laser pulse chirp to maintain optimum radiation pressure acceleration of ions journal February 2019
Ion acceleration in laser generated megatesla magnetic vortex journal October 2019
Effects of hole-boring and relativistic transparency on particle acceleration in overdense plasma irradiated by short multi-PW laser pulses journal September 2019
Preplasma effects on laser ion generation from thin foil targets journal January 2020
Revisit on ion acceleration mechanisms in solid targets driven by intense laser pulses journal November 2018
Single-pulse laser-electron collision within a micro-channel plasma target journal May 2019
Laser-driven acceleration of quasi-monoenergetic, near-collimated titanium ions via a transparency-enhanced acceleration scheme journal October 2019
Ion Acceleration in Laser Generated Mega Tesla Magnetic Vortex text January 2019
Effects of hole-boring and relativistic transparency on particle acceleration in overdense plasma irradiated by short multi-PW laser pulses text January 2019
Laser-driven generation of collimated quasi-monoenergetic proton beam using double-layer target with modulated interface journal August 2020
Radiation induced acceleration of ions preprint January 2019
Optimisation of Thin Plastic Foil Targets for Production of Laser-Generated Protons in the GeV Range preprint January 2019

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