2D X-Ray Radiography of Imploding Capsules at the National Ignition Facility

被引:177
作者
Rygg, J. R. [1 ]
Jones, O. S. [1 ]
Field, J. E. [1 ]
Barrios, M. A. [1 ]
Benedetti, L. R. [1 ]
Collins, G. W. [1 ]
Eder, D. C. [1 ]
Edwards, M. J. [1 ]
Kline, J. L. [2 ]
Kroll, J. J. [1 ]
Landen, O. L. [1 ]
Ma, T. [1 ]
Pak, A. [1 ]
Peterson, J. L. [1 ]
Raman, K. [1 ]
Town, R. P. J. [1 ]
Bradley, D. K. [1 ]
机构
[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA
[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
关键词
INERTIAL CONFINEMENT FUSION; NOVA HOHLRAUMS; TARGETS; SYMMETRY; DRIVE;
D O I
10.1103/PhysRevLett.112.195001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
First measurements of the in-flight shape of imploding inertial confinement fusion (ICF) capsules at the National Ignition Facility (NIF) were obtained by using two-dimensional x-ray radiography. The sequence of area-backlit, time-gated pinhole images is analyzed for implosion velocity, low-mode shape and density asymmetries, and the absolute offset and center-of-mass velocity of the capsule shell. The in-flight shell is often observed to be asymmetric even when the concomitant core self-emission is round. A similar to 15 mu m shell asymmetry amplitude of the Y-40 spherical harmonic mode was observed for standard NIF ICF hohlraums at a shell radius of similar to 200 mu m (capsule at similar to 5x radial compression). This asymmetry is mitigated by a similar to 10% increase in the hohlraum length.
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页数:5
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