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Title: Alpha heating and burning plasmas in inertial confinement fusion

Estimating the level of alpha heating and determining the onset of the burning plasma regime is essential to finding the path towards thermonuclear ignition. In a burning plasma, the alpha heating exceeds the external input energy to the plasma. Using a simple model of the implosion, it is shown that a general relation can be derived, connecting the burning plasma regime to the yield enhancement due to alpha heating and to experimentally measurable parameters such as the Lawson ignition parameter. A general alpha-heating curve is found, independent of the target and suitable to assess the performance of all laser fusion experiments whether direct or indirect drive. The onset of the burning plasma regime inside the hot spot of current implosions on the National Ignition Facility requires a fusion yield of about 50 kJ.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3]
  1. Univ. of Rochester, Rochester, NY (United States). Fusion Science Center and Lab. for Laser Energetics.
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. Politecnica de Madrid. Madrid (Spain)
Publication Date:
OSTI Identifier:
1197478
Report Number(s):
DOE-LLE--1944-1229
Journal ID: ISSN 0031-9007; PRLTAO; 2015-37; 2194; TIC-1229
DOE Contract Number:
NA0001944
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 114; Journal Issue: 25
Publisher:
American Physical Society (APS)
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