Generation and Beaming of Early Hot Electrons onto the Capsule in Laser-Driven Ignition Hohlraums

被引：50
作者：
Dewald, E. L. [1 ]
Hartemann, F. [1 ]
Michel, P. [1 ]
Milovich, J. [1 ]
Hohenberger, M. [2 ]
Pak, A. [1 ]
Landen, O. L. [1 ]
Divol, L. [1 ]
Robey, H. F. [1 ]
Hurricane, O. A. [1 ]
Doeppner, T. [1 ]
Albert, F. [1 ]
Bachmann, B. [1 ]
Meezan, N. B. [1 ]
MacKinnon, A. J. [1 ]
Callahan, D. [1 ]
Edwards, M. J. [1 ]
机构：
[1] Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA
[2] Univ Rochester, Laser Energet Lab, 250 E River Rd, Rochester, NY 14623 USA
来源：
PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 07期
关键词：
FACILITY; TARGETS;
D O I：
10.1103/PhysRevLett.116.075003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In hohlraums for inertial confinement fusion (ICF) implosions on the National Ignition Facility, suprathermal hot electrons, generated by laser plasma instabilities early in the laser pulse ("picket") while blowing down the laser entrance hole (LEH) windows, can preheat the capsule fuel. Hard x-ray imaging of a Bi capsule surrogate and of the hohlraum emissions, in conjunction with the measurement of time-resolved bremsstrahlung spectra, allows us to uncover for the first time the directionality of these hot electrons and infer the capsule preheat. Data and Monte Carlo calculations indicate that for most experiments the hot electrons are emitted nearly isotropically from the LEH. However, we have found cases where a significant fraction of the generated electrons are emitted in a collimated beam directly towards the capsule poles, where their local energy deposition is up to 10x higher than the average preheat value and acceptable levels for ICF implosions. The observed "beaming" is consistent with a recently unveiled multibeam stimulated Raman scattering model [P. Michel et al., Phys. Rev. Lett. 115, 055003 (2015)], where laser beams in a cone drive a common plasma wave on axis. Finally, we demonstrate that we can control the amount of generated hot electrons by changing the laser pulse shape and hohlraum plasma.
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页数：5
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