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Published on: May 7, 2021
A neutron time-of-flight system for inertial confinement fusion
Qi Tang1, Jiabin Chen1, Yunqing Xiao1
1Research Center of Laser Fusion, China Academy of Engineering Physics, P.O. Box 919-986, Mianyang, Sichuan 621900, China.
Abstract:
A neutron time-of-flight (nTOF) system has been implemented at the largest laser facility in China. The nTOF system is used to measure neutron spectra in inertial confinement fusion experiments. The nTOF system consists of 11 fast plastic scintillation detectors. The detectors employed three designs to measure neutron yield, ion temperature, and neutron bang time. The nTOF system is capable of measuring the primary neutron yield from 107 to 1013, secondary DT neutron yield from 106 to 108, and ion temperature and neutron bang time yields from 108 to 1013. The accuracies of the nTOF system are about 10% for neutron yield and ion temperature measurements and better than 60 ps for neutron bang time measurements. The nTOF system has become one of the most important diagnostics for implosions, and it is used for more than 200 shots per year.
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