Measurement of areal density in the ablators of inertial-confinement-fusion capsules via detection of ablator (n, n′γ) gamma-ray emission

被引：34

作者：

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

Herrmann, H. W. ^{[1
]}

Kim, Y. H. ^{[1
]}

Hsu, H. H. ^{[1
]}

Horsfield, C. J. ^{[2
]}

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

Miller, E. K. ^{[3
]}

Grafil, E. ^{[4
]}

Stoeffl, W. ^{[5
]}

Church, J. A. ^{[5
]}

Young, C. S. ^{[1
]}

Mack, J. M. ^{[1
]}

Wilson, D. C. ^{[1
]}

Langenbrunner, J. R. ^{[1
]}

Evans, S. C. ^{[1
]}

Sedillo, T. J. ^{[1
]}

Glebov, V. Yu. ^{[6
]}

Duffy, T. ^{[6
]}

机构：

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

[2] Atom Weap Estab, Aldermaston RG7 4PR, Berks, England

[3] Natl Secur Technol LLC, Santa Barbara, CA 93111 USA

[4] Colorado Sch Mines, Golden, CO 80401 USA

[5] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[6] Univ Rochester, Laser Energet Lab, Rochester, NY 14623 USA

来源：

PHYSICS OF PLASMAS | 2013年 / 20卷 / 04期

关键词：

NATIONAL IGNITION FACILITY; DIAGNOSTICS;

D O I：

10.1063/1.4799799

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 report the first gamma-ray-based measurements of the areal density of ablators in inertial-confinement-fusion capsule implosions. The measurements, made at the OMEGA laser [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)], used observations of gamma rays arising from inelastic scattering of 14.1-MeV deuterium-tritium (DT) neutrons on C-12 nuclei in the compressed plastic ablators. The emission of C-12(n,n'gamma) gamma rays from the capsules is detected using the Gamma Reaction History instrument [H. W. Herrmann et al., J. Phys.: Conf. Ser. 244, 032047 (2010)] operating at OMEGA. From the ratio of a capsule's C-12(n,n'gamma) emission to the emission from the same processes in an in situ reference graphite "puck" of known mass and geometry [N. M. Hoffman et al., in IFSA 2011 proceedings (submitted)], we determine the time-averaged areal density of C-12 in the capsule's compressed ablator. Measured values of total ablator areal density for thirteen imploded capsules, in the range 23 +/- 10 to 58 +/- 14 mg/cm(2), are comparable to values calculated in 1D radiation-hydrodynamic simulations, and measured by charged-particle techniques. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4799799]

引用

页数：14

共 7 条

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Hoffman, N. M.
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REVIEW OF SCIENTIFIC INSTRUMENTS, 2010, 81 (10):
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PHYSICS OF PLASMAS, 2023, 30 (02)
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North Carolina State Univ, Raleigh, United States
Nucl Sci Eng, 3 (326-343):

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