Abstract A current-mode neutron time-of-flight(nTOF) energy spectrometer for inertial confinement fusion(ICF) ion temperature measurements has been designed which will reduce measuring error of fusion neutron energy spectra when the neutron yield is low. The spectrometer consists of a shallow cup-shaped ST1422 fast plastic scintillator with a thicknees of 3mm and full effective volume of 104cm3, a microchannel plate photomultiplier tube(MCP-PMT), a piece of coaxial cable(SUJ-50-7) with a length of 20m, and a transient oscilloscope with a bandwidth of 7GHz. The main performances of the spectrometer and its components have been calibrated. The rise-time and FWHM of the temporal response function are 260ps and 850 ps, respectively. This spectrometer will be used to measure ion temperature in the direct-driven implosion experiments on Sheng-Guang 2 laser facility at Shanghai Institute of Optics and Fine Mechanica(SIOFM) next year.
Fund: Project supported by the National High-Tech(863) ICF Committee of China (Grant No. 863-416-4.8) and by the fund of Chinese Academy of Engineering Physics (Grant No. 990215).
Cite this article:
TANG ZHENG-YUAN (唐正元), YANG JIAN-LUN (杨建伦), WEN SHU-HUAI (温树槐), WANG GEN-XING (王根兴), GUO YU-ZHI (郭玉芝), YANG HONG-QIONG (杨洪琼), MA CHI (马驰) NEUTRON TIME OF FLIGHT ENERGY SPECTROMETER FOR ICF ION TEMPERATURE DIAGNOSTIC 1999 Acta Physica Sinica (Overseas Edition) 8 913
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