X-ray drive of beryllium capsule implosions at the National Ignition Facility

被引:6
|
作者
Wilson, D. C. [1 ]
Yi, S. A. [1 ]
Simakov, A. N. [1 ]
Kline, J. L. [1 ]
Kyrala, G. A. [1 ]
Dewald, E. L. [2 ]
Tommasini, R. [2 ]
Ralph, J. E. [2 ]
Olson, R. E. [1 ]
Strozzi, D. J. [2 ]
Celliers, P. M. [2 ]
Schneider, M. B. [2 ]
MacPhee, A. G. [2 ]
Zylstra, A. B. [1 ]
Callahan, D. A. [2 ]
Hurricane, O. A. [2 ]
Milovich, J. L. [2 ]
Hinkel, D. E. [2 ]
Rygg, J. R. [2 ]
Rinderknecht, H. G. [2 ]
Sio, H. [3 ]
Perry, T. S. [1 ]
Batha, S. [1 ]
机构
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[2] Lawrence Livermore Natl Lab, Livermore, CA USA
[3] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA
来源
9TH INTERNATIONAL CONFERENCE ON INERTIAL FUSION SCIENCES AND APPLICATIONS (IFSA 2015) | 2016年 / 717卷
关键词
D O I
10.1088/1742-6596/717/1/012058
中图分类号
O59 [应用物理学];
学科分类号
摘要
National Ignition Facility experiments with beryllium capsules have followed a path begun with "high-foot" plastic capsule implosions. Three shock timing keyhole targets, one symmetry capsule, a streaked backlit capsule, and a 2D backlit capsule were fielded before the DT layered shot. After backscatter subtraction, laser drive degradation is needed to match observed X-ray drives. VISAR measurements determined drive degradation for the picket, trough, and second pulse. Time dependence of the total Dante flux reflects degradation of the of the third laser pulse. The same drive degradation that matches Dante data for three beryllium shots matches Dante and bangtimes for plastic shots N130501 and N130812. In the picket of both Be and CH hohlraums, calculations over-estimate the x-ray flux > 1.8 keV by similar to 100X, while calculating the total flux correctly. In beryllium calculations these X-rays cause an early expansion of the beryllium/fuel interface at similar to 3 km/s. VISAR measurements gave only similar to 0.3 km/s. The X-ray drive on the Be DT capsule was further degraded by an unplanned decrease of 9% in the total picket flux. This small change caused the fuel adiabat to rise from 1.8 to 2.3. The first NIF beryllium DT implosion achieved 29% of calculated yield, compared to CH capsules with 68% and 21%.
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页数:4
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