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Title: The control of hot-electron preheat in shock-ignition implosions

In the shock-ignition scheme for inertial confinement fusion, hot electrons resulting from laser–plasma instabilities can play a major role during the late stage of the implosion. This article presents the results of an experiment performed on OMEGA in the so-called “40 + 20 configuration.” Using a recent calibration of the time-resolved hard x-ray diagnostic, the hot electrons’ temperature and total energy were measured. One-dimensional radiation–hydrodynamic simulations have been performed that include hot electrons and are in agreement with the measured neutron-rate–averaged areal density. For an early spike launch, both experiment and simulations show the detrimental effect of hot electrons on areal density and neutron yield. Lastly, for a later spike launch, this effect is minimized because of a higher compression of the target.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ; ORCiD logo [3] ; ORCiD logo [2] ; ORCiD logo [5] ;  [2] ; ORCiD logo [3] ;  [2] ;  [2] ;  [2]
  1. Univ. de Bordeaux (France). Centre Lasers Intenses et Applications, CELIA; Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
  2. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
  3. Univ. de Bordeaux (France). Centre Lasers Intenses et Applications, CELIA
  4. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics; Univ. of Rochester, Rochester, NY (United States). Dept. of Physics and Astronomy; Univ. of Rochester, Rochester, NY (United States). Dept. of Mechanical Engineering
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Grant/Contract Number:
NA0001944
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; 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:
1457359
Alternate Identifier(s):
OSTI ID: 1438280