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Experimental Evidence of Kinetic Effects in Indirect-Drive Inertial Confinement Fusion Hohlraums

Experimental Evidence of Kinetic Effects in Indirect-Drive Inertial Confinement Fusion Hohlraums

Authors :
L F Cao
L Yang
Z F Song
Hong-bo Cai
Shaoping Zhu
D X Liu
Z Q Yuan
Yikun Gu
Bing Zhang
B Cui
J L Jiao
Weimin Zhou
B H Zhang
F J Ge
L Q Shan
Xian-Tu He
Q Tang
W S Zhang
Fan Zhang
J B Chen
Z H Yang
W Qi
C Tian
Wang Wei
B Bi
C T Zhou
Source :
Physical review letters. 120(19)
Publication Year :
2018

Abstract

We present the first experimental evidence supported by simulations of kinetic effects launched in the interpenetration layer between the laser-driven hohlraum plasma bubbles and the corona plasma of the compressed pellet at the Shenguang-III prototype laser facility. Solid plastic capsules were coated with carbon-deuterium layers; as the implosion neutron yield is quenched, DD fusion yield from the corona plasma provides a direct measure of the kinetic effects inside the hohlraum. An anomalous large energy spread of the DD neutron signal (∼282 keV) and anomalous scaling of the neutron yield with the thickness of the carbon-deuterium layers cannot be explained by the hydrodynamic mechanisms. Instead, these results can be attributed to kinetic shocks that arise in the hohlraum-wall-ablator interpenetration region, which result in efficient acceleration of the deuterons (∼28.8 J, 0.45% of the total input laser energy). These studies provide novel insight into the interactions and dynamics of a vacuum hohlraum and near-vacuum hohlraum.

Details

ISSN :
10797114
Volume :
120
Issue :
19
Database :
OpenAIRE
Journal :
Physical review letters
Accession number :
edsair.doi.dedup.....7574a5406fd7c0fe7f10e1148b8509c2