Using time-resolved penumbral imaging to measure low hot spot x-ray emission signals from capsule implosions at the National Ignition Facility

被引：6

作者：

Bishel, D. T. ^{[1
]}

Bachmann, B. ^{[1
]}

Yi, A. ^{[2
]}

Kraus, D. ^{[3
]}

Divol, L. ^{[1
]}

Bethkenhagen, M. ^{[1
,4
]}

Falcone, R. W. ^{[5
]}

Fletcher, L. B. ^{[6
]}

Glenzer, S. H. ^{[6
]}

Landen, O. L. ^{[1
]}

MacDonald, M. J. ^{[5
]}

Masters, N. ^{[1
]}

Neumayer, P. ^{[7
]}

Redmer, R. ^{[4
]}

Saunders, A. M. ^{[5
]}

Witte, B. B. L. ^{[4
,6
]}

Doppner, T. ^{[1
]}

机构：

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

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

[3] Helmholtz Zentrum Dresden Rossendorf, D-01328 Dresden, Germany

[4] Univ Rostock, Inst Phys, D-18051 Rostock, Germany

[5] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[6] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[7] GSI Helmholtz Zentrum Schwerionenforsch, D-64291 Darmstadt, Germany

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2018年 / 89卷 / 10期

关键词：

SCATTERING; STATE;

D O I：

10.1063/1.5037073

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We have developed and fielded a new x-ray pinhole-imaging snout that exploits time-resolved penumbral imaging of low-emission hot spots in capsule implosion experiments at the National Ignition Facility. We report results for a series of indirectly driven Be capsule implosions that aim at measuring x-ray Thomson scattering (XRTS) spectra at extreme density conditions near stagnation. In these implosions, x-ray emission at stagnation is reduced by 100-1000X compared to standard inertial confinement fusion (ICF) implosions to mitigate undesired continuum background in the XRTS spectra. Our snout design not only enables measurements of peak x-ray emission times, t(o), where standard ICF diagnostics would not record any signal, but also allows for inference of hot spot shapes. Measurement of t(o) is crucial to account for shot-to-shot variations in implosion velocity and therefore to benchmark the achieved plasma conditions between shots and against radiation hydrodynamic simulations. Additionally, we used differential filtering to infer a hot spot temperature of 520 +/- 80 eV, which is in good agreement with predictions from radiation hydrodynamic simulations. We find that, despite fluctuations of the x-ray flash intensity of up to 5X, the emission time history is similar from shot to shot and slightly asymmetric with respect to peak x-ray emission. Published by AIP Publishing.

引用

页数：5

共 21 条

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