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Title: Use of external magnetic fields in hohlraum plasmas to improve laser-coupling

Efficient coupling of laser energy into hohlraum targets is important for indirect drive ignition. Laser-plasma instabilities can reduce coupling, reduce symmetry, and cause preheat. We consider the effects of an external magnetic field on laser-energy coupling in hohlraum targets. Experiments were performed at the Omega Laser Facility using low-Z gas-filled hohlraum targets which were placed in a magnetic coil with B{sub z} ≤ 7.5-T. We found that an external field B{sub z} = 7.5-T aligned along the hohlraum axis results in up to a 50% increase in plasma temperature as measured by Thomson scattering. The experiments were modeled using the 2-D magnetohydrodynamics package in HYDRA and were found to be in good agreement.
Authors:
; ; ;  [1] ; ; ; ; ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)
  3. Department of Atmospheric, Oceanic, and Space Science, University of Michigan, Ann Arbor, Michigan 48109 (United States)
  4. (United States)
  5. Sandia National Laboratory, Albuquerque, New Mexico 87185 (United States)
Publication Date:
OSTI Identifier:
22407977
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COUPLING; ELECTRON TEMPERATURE; ION TEMPERATURE; LASERS; MAGNET COILS; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; PLASMA INSTABILITY; SYMMETRY; THERMONUCLEAR IGNITION; THOMSON SCATTERING