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Density gradient effects on beam plasma linear instabilities for fast ignition scenario

Published online by Cambridge University Press:  08 June 2006

ANTOINE BRET  and
CLAUDE DEUTSCH
ANTOINE BRET
Affiliation:
ETSI Industriales, Universidad Castilla la Mancha, Ciudad Real, Spain
CLAUDE DEUTSCH
Affiliation:
Laboratoire de Physique des Gaz et des Plasmas (CNRS-UMR 8578), Université Paris XI, Orsay cedex, France
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Abstract

In the fast ignition scenario for inertial fusion, a relativistic electron beam is supposed to travel from the side of the fusion pellet to its core. One one hand, a relativistic electron beam passing through a plasma is a highly unstable system. On the other hand, the pellet core is denser than its side by four orders of magnitude so that the beam makes its way through a important density gradient. We here investigate the effect of this gradient on the instabilities. It is found that they should develop so early that gradient effects are negligible in the linear phase.

Keywords

Fast ignition scenarioFilamentation InstabilityTwo-Stream Instability
Type
Research Article
Information
Laser and Particle Beams , Volume 24 , Issue 2 , June 2006 , pp. 269 - 273
Copyright
© 2006 Cambridge University Press

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