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Innovations for warm dense matter research may lead to improved heavy ion fusion approach

Author: B. Grant Logan
Requested Type: Consider for Invited
Submitted: 2006-12-07 12:20:46

Co-authors: Ron Davidson, John Barnard, Alex Friedman

Contact Info:
LBNL
1 Cyclotron Rd
Berkeley, CA   94720-8
USA

Abstract Text:
Recent work in the tri-lab collaboration for heavy ion fusion science (LBNL,LLNL and PPPL)has been able to transversely focus intense heavy ion beams by 20 X in radius and longitudinally compress by more than 60 X using a low density preformed background plasma downstream of the accelerator to neutralize the beam space charge, when the beam space charge would otherwise be too high to compress more than factors of 2-4. A 15% head-to-tail velocity ramp is induced upon the beam before entering the plasma by a carefully tailored induction pulse,causing the beam pulse to longitudinally compress within the plasma to less than 3 ns, down to the range allowing near term studies of warm dense matter heated by the short beam pulses, and within the temporal pulse widths required for heavy ion fusion, for the first time. In this talk, we consider how these innovations may be applied to heavy ion target physics experiments in the future,after NIF ignition, to directly drive frozen D2 shells from two sides in polar direct drive geometry. Such innovations will allow the tri-lab effort to extend the present warme dense plasma target research to the high energy density physics relevant to direct drive heavy-ions fusion, including dynamic beam modulations to stabilize Rayleigh-Tayloe instabilities. If successful, these future experiments may reduce heavy ion fusion driver energy requirements from 7 MJ to 1 MJ. Cat. B5

Characterization: B5

Comments:
Use B5 category

University of Maryland

Innovative Confinement Concepts Workshop
February 12-14, 2007
College Park, Maryland

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