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- Title
Nuclear diagnosis of the fuel areal density for direct-drive deuterium fuel implosion at the Shenguang-II Upgrade laser facility.
- Authors
Cui, Bo; Fang, Zhiheng; Dai, Zenghai; Liu, Hongjie; Wang, Wei; Chen, Jiabin; Bi, Bi; Tian, Chao; Liu, Dongxiao; Wang, Weiwu; Shan, Lianqiang; Lu, Feng; Li, Gang; Zhang, Faqiang; Zhang, Bo; Zhang, Zhimeng; Deng, Zhigang; He, Shukai; Teng, Jian; Hong, Wei
- 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 (〈ρ R 〉) 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.
- Publication
Laser & Particle Beams, 2018, Vol 36, Issue 4, p494
- ISSN
0263-0346
- Publication type
Article
- DOI
10.1017/S026303461800054X