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Title: Comment on “In-depth Plasma-Wave Heating of Dense Plasma Irradiated by Short Laser Pulses”

Sherlock et al. have reported on the heating of solid density targets by collisional damping of wakefields that are driven by relativistic electron bunches generated in relativistic laser matter interaction. Analyzing collisional particle-in-cell simulations they calculate the fast electron current jf inside the plasma by adding contributions from electrons with energies greater than E cut = 50 keV; time-integrating the specific resistive energy deposition η j2f they arrive at a temperature profile and compare the result to the one 'measured' in their simulation, defined as the energy of particles with E < 30 keV; the discrepancy is due to collisional damping of wake fields (CDW). Here, we disagree with their metric of fast current, which leads to false conclusions about CDW heating being a volumetric, rather than surface effect.
Authors:
 [1] ;  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Nevada, Reno, NV (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-678702
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 15; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING
OSTI Identifier:
1367994
Alternate Identifier(s):
OSTI ID: 1247442

Kemp, A. J., and Sentoku, Y.. Comment on “In-depth Plasma-Wave Heating of Dense Plasma Irradiated by Short Laser Pulses”. United States: N. p., Web. doi:10.1103/PhysRevLett.116.159501.
Kemp, A. J., & Sentoku, Y.. Comment on “In-depth Plasma-Wave Heating of Dense Plasma Irradiated by Short Laser Pulses”. United States. doi:10.1103/PhysRevLett.116.159501.
Kemp, A. J., and Sentoku, Y.. 2016. "Comment on “In-depth Plasma-Wave Heating of Dense Plasma Irradiated by Short Laser Pulses”". United States. doi:10.1103/PhysRevLett.116.159501. https://www.osti.gov/servlets/purl/1367994.
@article{osti_1367994,
title = {Comment on “In-depth Plasma-Wave Heating of Dense Plasma Irradiated by Short Laser Pulses”},
author = {Kemp, A. J. and Sentoku, Y.},
abstractNote = {Sherlock et al. have reported on the heating of solid density targets by collisional damping of wakefields that are driven by relativistic electron bunches generated in relativistic laser matter interaction. Analyzing collisional particle-in-cell simulations they calculate the fast electron current jf inside the plasma by adding contributions from electrons with energies greater than Ecut = 50 keV; time-integrating the specific resistive energy deposition η j2f they arrive at a temperature profile and compare the result to the one 'measured' in their simulation, defined as the energy of particles with E < 30 keV; the discrepancy is due to collisional damping of wake fields (CDW). Here, we disagree with their metric of fast current, which leads to false conclusions about CDW heating being a volumetric, rather than surface effect.},
doi = {10.1103/PhysRevLett.116.159501},
journal = {Physical Review Letters},
number = 15,
volume = 116,
place = {United States},
year = {2016},
month = {4}
}