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Title: LDRD Annual Report 2013

Target normal sheath acceleration (TNSA) by self-guided laser pulses is demonstrated at a range of Al target thickness (2-10 microns), and proton spectra are compared with those accelerated by un-guided laser pulses. For un-guided pulses, the maximum proton energy decreases with the decrease of target thickness, exhibiting the detrimental effect of laser pre-pulse on TNSA. On the other hand, the dependence of proton energy on target thickness was not observed when using self-guided laser pulses, which is possibly due to the suppressed pre-pulse intensity. However the laser pulse appears to lose a significant amount of energy (>~50%) during ~4mm self-guiding in the plasma, and thus the accelerated proton energy is much lower than the case of unguided pulses.
Authors:
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
OSTI Identifier:
1113390
Report Number(s):
LLNL-TR--645917
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING