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Title: Investigation of laser pulse length and pre-plasma scale length impact on hot electron generation on OMEGA-EP

A series of experiments studying pre-plasma’s effect on electron generation and transport due to a high intensity laser were conducted on the OMEGA-EP laser facility. A controlled pre-plasma was produced in front of an aluminum foil target prior to the arrival of the high intensity short pulse beam. Energetic electron spectra were characterized with magnetic and bremsstrahlung spectrometers. Preplasma and pulse length were shown to have a large impact on the temperature of lower energy, ponderomotive scaling electrons. Furthermore, super-ponderomotive electrons, seen in prior pre-plasma experiments with shorter pulses, were observed without any initial pre-plasma in our experiment. 2D particle-in-cell and radiation-hydrodynamic simulations shed light on and validate these experimental results.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ;  [1] ; ORCiD logo [2] ;  [4] ;  [4] ;  [5] ;  [5] ;  [5] ;  [5] ;  [1] ;  [1] ;  [1]
  1. Univ. of California San Diego, La Jolla, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. The Univ. of Texas, Austin, TX (United States)
  4. Lab. for Laser Energetics, Rochester, NY (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-742214
Journal ID: ISSN 1367-2630; TRN: US1702163
Grant/Contract Number:
NA0002026; NA0001858; NA0002008; AC52-07NA27344
Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 19; Journal Issue: 2; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Research Org:
General Atomics, San Diego, CA (United States); Univ. of California, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; high intensity; laser plasma interaction; fast electron beams; particle-in-cell modeling; plasma physics; pre-plasma; bremsstrahlung spectrometer; high energy particles; PIC simulation; 70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING; electron beams
OSTI Identifier:
1342282
Alternate Identifier(s):
OSTI ID: 1357805; OSTI ID: 1411691