Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas

被引：32

作者：

Hayes, A. C. ^{[1
]}

Jungman, Gerard ^{[1
]}

Schulz, A. E. ^{[1
]}

Boswell, M. ^{[1
]}

Fowler, M. M. ^{[1
]}

Grim, G. ^{[1
]}

Klein, A. ^{[1
]}

Rundberg, R. S. ^{[1
]}

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

Wilson, D. ^{[1
]}

Cerjan, C. ^{[2
]}

Schneider, D. ^{[2
]}

Sepke, S. M. ^{[2
]}

Tonchev, A. ^{[2
]}

Yeamans, C. ^{[2
]}

机构：

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

[2] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

来源：

PHYSICS OF PLASMAS | 2015年 / 22卷 / 08期

关键词：

PARTICLE; SIMULATIONS; EMISSION; DYNAMICS;

D O I：

10.1063/1.4928104

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：

We present the first measurements of reaction-in-flight (RIF) neutrons in an inertial confinement fusion system. The experiments were carried out at the National Ignition Facility, using both Low Foot and High Foot drives and cryogenic plastic capsules. In both cases, the high-energy RIF (E-n > 15 MeV) component of the neutron spectrum was found to be about 10(-4) of the total. The majority of the RIF neutrons were produced in the dense cold fuel surrounding the burning hotspot of the capsule, and the data are consistent with a compressed cold fuel that is moderately to strongly coupled (Gamma similar to 0.6) and electron degenerate (theta(Fermi)/theta(e) similar to 4). The production of RIF neutrons is controlled by the stopping power in the plasma. Thus, the current RIF measurements provide a unique test of stopping power models in an experimentally unexplored plasma regime. We find that the measured RIF data strongly constrain stopping models in warm dense plasma conditions, and some models are ruled out by our analysis of these experiments. (C) 2015 AIP Publishing LLC.

引用

页数：7

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