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Onset of coherent electromagnetic structures in the relativistic electron beam deuterium-tritium fuel interaction of fast ignition concern

Published online by Cambridge University Press:  16 June 2008

C. Deutsch*
Affiliation:
LPGP, Université Paris-Sud, Orsay, France
A. Bret
Affiliation:
ETSIL, Universitad Castilla-la-Mancha, Ciudad-Real, Spain
M.-C. Firpo
Affiliation:
LPTP, Ecole Polytechnique, Palaiseau, France
L. Gremillet
Affiliation:
CEN, Bruyères-le-Châtel, France
E. Lefebvre
Affiliation:
LPGP, Université Paris-Sud, Orsay, France
A. Lifschitz
Affiliation:
LPGP, Université Paris-Sud, Orsay, France
*
Address correspondence and reprint requests to: C. Deutsch, Labortoire de Physique des Gaz et Plasma, University of Paris XI, Orsay 91405, France. E-mail: claude.deutsch@pgp.u-psud.fr

Abstract

We focus attention on the combinations of swiftly growing electromagnetic instabilities (EMI) arising in the interaction of relativistic electron beams (REB) with precompressed deuterium-tritium (DT) fuels of fast ignition interest for inertial confinement fusion (ICF). REB-target system is taken neutral in charge and current with distribution functions including target and beam temperatures. We stress also the significant impact on modes growth rates (GR) of mode-mode coupling and intrabeam scattering. Collisional damping is documented at large wave numbers in terms of inverse skin depth. A quasi-linear approach yields lower GR than linear ones. One of the most conspicuous output of the linear analysis are three-dimensional (3D) broken ridges featuring the largest GR above k-space for an oblique propagation w.r.t initial particle beam direction. The given modes are seen immune to any temperature induced damping. Those novel patterns are easily produced by considering simultaneously Weibel, filamentation and two-stream instabilities. The behaviors persist in the presence of smooth density gradients or strong applied magnetic fields. Moreover, in the very early propagation stage with no current neutralization in the presence of large edge density gradients, REB demonstrate a characteristics ringlike and regularly spiked pattern in agreement with recent experimental results and previous simulations.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2008

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References

REFERENCES

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Onset of coherent electromagnetic structures in the relativistic electron beam deuterium-tritium fuel interaction of fast ignition concern
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