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Manipulation of the spatial distribution of laser-accelerated proton beams by varying the laser intensity distribution

Aurand, B. LU ; Senje, L. LU ; Svensson, K. LU ; Hansson, M. LU ; Higginson, A.; Gonoskov, A.; Marklund, M.; Persson, A. LU ; Lundh, O. LU and Neely, D., et al. (2016) In Physics of Plasmas 23(2).
Abstract

We report on a study of the spatial profile of proton beams produced through target normal sheath acceleration using flat target foils and changing the laser intensity distribution on the target front surface. This is done by either defocusing a single laser pulse or by using a split-pulse setup and irradiating the target with two identical laser pulses with variable spatial separation. The resulting proton beam profile and the energy spectrum are recorded as functions of the focal spot size of the single laser pulse and of the separation between the two pulses. A shaping of the resulting proton beam profile, related to both an increase in flux of low-energy protons in the target normal direction and a decrease in their divergence, in... (More)

We report on a study of the spatial profile of proton beams produced through target normal sheath acceleration using flat target foils and changing the laser intensity distribution on the target front surface. This is done by either defocusing a single laser pulse or by using a split-pulse setup and irradiating the target with two identical laser pulses with variable spatial separation. The resulting proton beam profile and the energy spectrum are recorded as functions of the focal spot size of the single laser pulse and of the separation between the two pulses. A shaping of the resulting proton beam profile, related to both an increase in flux of low-energy protons in the target normal direction and a decrease in their divergence, in one or two dimensions, is observed. The results are explained by simple modelling of rear surface sheath field expansion, ionization, and projection of the resulting proton beam.

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publication status
published
subject
in
Physics of Plasmas
volume
23
issue
2
publisher
American Institute of Physics
external identifiers
  • Scopus:84959450044
ISSN
1070-664X
DOI
10.1063/1.4942032
language
English
LU publication?
yes
id
6e0ba505-0f7f-494c-96fc-339025e23f90
date added to LUP
2016-09-20 08:17:02
date last changed
2016-09-20 08:17:02
@misc{6e0ba505-0f7f-494c-96fc-339025e23f90,
  abstract     = {<p>We report on a study of the spatial profile of proton beams produced through target normal sheath acceleration using flat target foils and changing the laser intensity distribution on the target front surface. This is done by either defocusing a single laser pulse or by using a split-pulse setup and irradiating the target with two identical laser pulses with variable spatial separation. The resulting proton beam profile and the energy spectrum are recorded as functions of the focal spot size of the single laser pulse and of the separation between the two pulses. A shaping of the resulting proton beam profile, related to both an increase in flux of low-energy protons in the target normal direction and a decrease in their divergence, in one or two dimensions, is observed. The results are explained by simple modelling of rear surface sheath field expansion, ionization, and projection of the resulting proton beam.</p>},
  author       = {Aurand, B. and Senje, L. and Svensson, K. and Hansson, M. and Higginson, A. and Gonoskov, A. and Marklund, M. and Persson, A. and Lundh, O. and Neely, D. and McKenna, P. and Wahlström, C. G.},
  issn         = {1070-664X},
  language     = {eng},
  month        = {02},
  number       = {2},
  publisher    = {ARRAY(0x939ab90)},
  series       = {Physics of Plasmas},
  title        = {Manipulation of the spatial distribution of laser-accelerated proton beams by varying the laser intensity distribution},
  url          = {http://dx.doi.org/10.1063/1.4942032},
  volume       = {23},
  year         = {2016},
}