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Title: Strong shock generation by fast electron energy deposition

It has been suggested that fast electrons may play a beneficial role in the formation of the ignitor shock in shock ignition owing to the high areal density of the fuel at the time of the ignitor pulse. In this paper, we extend previous studies which have focused on monoenergetic electron sources to populations with extended energy distributions. In good agreement with analytic scalings, we show that strong shocks can be produced with peak pressures of a few hundred Mbar to over 1 Gbar using fast electron intensities of 1–10 PW/cm{sup 2} in a uniform deuterium-tritium plasma at 10 g/cm{sup 3}. However, the length required for shock formation increases with fast electron temperature. As this shock formation distance becomes comparable to the target size, the shock is not able to fully develop, and this implies a limit on the ability of fast electrons to aid shock formation.
Authors:
;  [1] ;  [2] ;  [3]
  1. York Plasma Institute, University of York, York YO10 5DD (United Kingdom)
  2. (United Kingdom)
  3. Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX (United Kingdom)
Publication Date:
OSTI Identifier:
22218354
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 12; Other Information: (c) 2013 Crown; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPARATIVE EVALUATIONS; DEUTERIUM; D-T OPERATION; ELECTRON SOURCES; ELECTRON TEMPERATURE; ELECTRONS; ENERGY ABSORPTION; ENERGY LOSSES; ENERGY SPECTRA; ION TEMPERATURE; PLASMA; SHOCK WAVES; THERMONUCLEAR IGNITION; TRITIUM