Observation of significant Doppler shift in deuterium-deuterium neutron energy caused by neutral beam injection in the large helical device

AAPPS Bulletin Pub Date : 2022-02-14 DOI:10.1007/s43673-022-00036-5

S. Sangaroon, K. Ogawa, M. Isobe, M. I. Kobayashi, Y. Fujiwara, S. Kamio, H. Yamaguchi, R. Seki, H. Nuga, E. Takada, S. Murakami, G. Q. Zhong, M. Osakabe

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Abstract

The compact neutron emission spectrometer (CNES) having a tangential sightline was installed to observe a significant Doppler shift of the neutron energy due to the high-energy tangential neutral beam (NB) injections in the Large Helical Device (LHD) for understanding of the energy distribution of fast-ion. The CNES is based on a 1-inch diameter and 1-inch height EJ301 liquid scintillator coupled with a conventional 1-inch photomultiplier tube. The histogram of the integrated pulse signal (Q_total) during different NBs heating phases measured by the CNES shows that the edge of Q_total changes depending on NB directions. Using the simple derivative unfolding technique, the neutron energy spectra were unfolded from the measured Q_total histogram. Peaks of the neutron energy shift to 2.0 MeV, 2.42 MeV, and 3.0 MeV according to the injection direction of NBs. The obtained neutron energy is almost consistent with the virgin deuterium-deuterium neutron energy evaluated by the simple two-body kinematics considering the sightline of CNES, NB injection angle, and NB injection energy.

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在大型螺旋装置中观测到中性束注入引起的氘-氘中子能量的明显多普勒偏移

安装切向视线紧凑型中子发射光谱仪（CNES）是为了观测大型螺旋装置（LHD）中高能切向中性束（NB）注入引起的中子能量的显著多普勒偏移，以了解快离子的能量分布。CNES 基于一个直径 1 英寸、高 1 英寸的 EJ301 液体闪烁器和一个传统的 1 英寸光电倍增管。CNES 测量的不同 NB 加热阶段的积分脉冲信号（Qtotal）直方图显示，Qtotal 的边缘随 NB 方向的变化而变化。利用简单的导数展开技术，从测量到的 Qtotal 直方图展开了中子能谱。根据 NB 的注入方向，中子能量峰分别转移到 2.0 MeV、2.42 MeV 和 3.0 MeV。所获得的中子能量与考虑到 CNES 的视线、NB 注入角度和 NB 注入能量的简单二体运动学所评估的原始氘-氘中子能量基本一致。

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来源期刊

AAPPS Bulletin

CiteScore

8.20

自引率

0.00%

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