Revised Knudsen-layer reduction of fusion reactivity

被引：49

作者：

Albright, B. J. ^{[1
]}

Molvig, Kim ^{[1
]}

Huang, C. -K. ^{[1
]}

Simakov, A. N. ^{[1
]}

Dodd, E. S. ^{[1
]}

Hoffman, N. M. ^{[1
]}

Kagan, G. ^{[1
]}

Schmit, P. F. ^{[2
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

PHYSICS OF PLASMAS | 2013年 / 20卷 / 12期

关键词：

17;

D O I：

10.1063/1.4833639

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Recent work by Molvig et al. [Phys. Rev. Lett. 109, 095001 (2012)] examined how fusion reactivity may be reduced from losses of fast ions in finite assemblies of fuel. In this paper, this problem is revisited with the addition of an asymptotic boundary-layer treatment of ion kinetic losses. This boundary solution, reminiscent of the classical Milne problem from linear transport theory, obtains a free-streaming limit of fast ion losses near the boundary, where the diffusion approximation is invalid. Thermonuclear reaction rates have been obtained for the ion distribution functions predicted by this improved model. It is found that while Molvig's "Knudsen distribution function" bounds from above the magnitude of the reactivity reduction, this more accurate treatment leads to less dramatic losses of tail ions and associated reduction of thermonuclear reaction rates for finite fuel volumes. (C) 2013 AIP Publishing LLC.

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页数：7

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