PMID: 15244657Jul 13, 2004Paper

Alfvén limit in fast ignition

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
J R Davies

Abstract

Fast ignition inertial confinement fusion relies on rapidly heating the compressed fuel to ignition using a laser-generated electron beam. The current required far exceeds the Alfvén limit, so it can only propagate while the plasma provides a nearly coincident return current. The resistive decay of the return current is shown to be too rapid for the originally proposed scheme to work. Possible solutions to this problem are to increase the mean energy of the beam, to heat the fuel to a higher temperature by lowering the beam radius and duration, to use multiple beams, and to use an annular beam. Considering the laser wavelength required shows that increasing the mean energy and number of beams are the most practical solutions.

References

Feb 15, 2001·Physical Review Letters·S Hain, P Mulser
Feb 28, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J R Davies
Apr 24, 2002·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·J R DaviesM Tatarakis
Oct 4, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J R Davies
Dec 20, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J R Davies

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Citations

Sep 17, 2013·Physical Review Letters·D A MacLellanP McKenna
Feb 9, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·D RileyD Neely

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