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Nuclear diagnosis of the fuel areal density for direct-drive deuterium fuel implosion at the Shenguang-II Upgrade laser facility

Published online by Cambridge University Press:  15 February 2019

Bo Cui Open the ORCID record for Bo Cui [Opens in a new window] ,
Zhiheng Fang ,
Zenghai Dai ,
Hongjie Liu ,
Wei Wang ,
Jiabin Chen ,
Bi Bi ,
Chao Tian ,
Dongxiao Liu  and
Weiwu Wang
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Bo Cui
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Zhiheng Fang
Affiliation:
Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China
Zenghai Dai
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Hongjie Liu*
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Wei Wang
Affiliation:
Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China
Jiabin Chen
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Bi Bi
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Chao Tian
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Dongxiao Liu
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Weiwu Wang
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Lianqiang Shan
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Feng Lu
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Gang Li
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Faqiang Zhang
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Bo Zhang
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Zhimeng Zhang
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Zhigang Deng
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Shukai He
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Jian Teng
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Wei Hong
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Yuqiu Gu*
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Baohan Zhang
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
*
Author for correspondence: Y.Q. Gu and H.J. Liu, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, China, E-mail: [email protected]; [email protected]
Author for correspondence: Y.Q. Gu and H.J. Liu, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, China, E-mail: [email protected]; [email protected]
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Abstract

In inertial confinement fusion experiments that involve short-laser pulses such as fast ignition (FI), diagnosis of neutrons is usually very challenging because high-intensity γ rays generated by short-laser pulses would mask the much weaker neutron signal. In this paper, fast-response scintillators with low afterglow and gated microchannel plate photomultiplier tubes are combined to build neutron time-of-flight (nTOF) spectrometers for such experiments. Direct-drive implosion experiments of deuterium-gas-filled capsules were performed at the Shenguang-II Upgrade (SG-II-UP) laser facility to study the compressed fuel areal density (〈ρR〉) and evaluate the performance of such nTOF diagnostics. Two newly developed quenched liquid scintillator detectors and a gated ultrafast plastic scintillator detector were used to measure the secondary DT neutrons and primary DD neutrons, respectively. The secondary neutron signals were clearly discriminated from the γ rays from (n, γ) reactions, and the compressed fuel areal density obtained with the yield-ratio method agrees well with the simulations. Additionally, a small scintillator decay tail and a clear DD neutron signal were observed in an integrated FI experiment as a result of the low afterglow of the oxygen-quenched liquid scintillator.

Keywords

Fuel areal densitylow afterglowneutron time-of-flightscintillator detectoryield-ratio method
Type
Research Article
Information
Laser and Particle Beams , Volume 36 , Issue 4 , December 2018 , pp. 494 - 501
Copyright
Copyright © Cambridge University Press 2019 

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