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Title: Enhanced hot-electron production and strong-shock generation in hydrogen-rich ablators for shock ignition

Experiments were performed with CH, Be, C, and SiO 2 ablators interacting with high-intensity UV laser radiation (5 × 10 15 W/cm 2, λ = 351 nm) to determine the optimum material for hot-electron production and strong-shock generation. Significantly more hot electrons are produced in CH (up to ~13% instantaneous conversion efficiency), while the amount is a factor of ~2 to 3 lower in the other ablators. A larger hot-electron fraction is correlated with a higher effective ablation pressure. As a result, the higher conversion efficiency in CH is attributed to stronger damping of ion-acoustic waves because of the presence of light H ions.
Authors:
 [1] ; ORCiD logo [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [1] ;  [1] ;  [1] ;  [4] ; ORCiD logo [1] ;  [1] ; ORCiD logo [5] ; ORCiD logo [6] ; ORCiD logo [1] ;  [7] ;  [8] ;  [8] ;  [8] ; ORCiD logo [8] more »;  [9] « less
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Univ. of Rochester, Rochester, NY (United States); Univ. of Science and Technology of China, Hefei (People's Republic of China)
  3. Univ. of Rochester, Rochester, NY (United States); CEA, DAM, DIF, Arpajon (France)
  4. Univ. of Rochester, Rochester, NY (United States); Chinese Academy of Engineering Physics, Mianyang (People's Republic of China)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. CEA, DAM, DIF, Arpajon (France); Univ. de Bordeaux CNRS-CEA, Talence (France)
  7. Univ. of California-San Diego, La Jolla, CA (United States)
  8. Univ. de Bordeaux CNRS-CEA, Talence (France)
  9. General Atomics, San Diego, CA (United States)
Publication Date:
Report Number(s):
2017-62, 1367
Journal ID: ISSN 1070-664X; 2017-62, 2323, 1367; TRN: US1801097
Grant/Contract Number:
NA0001944; FC02-04ER54789
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 12; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1417651
Alternate Identifier(s):
OSTI ID: 1411997