Tangential hard x-ray diagnostic array on the EXL-50 spherical tokamak

S K Cheng; Y B Zhu; Z Y Chen; Y X Li; R H Bai; B Chen; X L Huang; L L Dai; M S Liu

doi:10.1063/5.0040636

Tangential hard x-ray diagnostic array on the EXL-50 spherical tokamak

Rev Sci Instrum. 2021 Apr 1;92(4):043513. doi: 10.1063/5.0040636.

Authors

S K Cheng¹, Y B Zhu¹, Z Y Chen², Y X Li¹, R H Bai¹, B Chen¹, X L Huang¹, L L Dai¹, M S Liu¹

Affiliations

¹ Hebei Key Laboratory of Compact Fusion, Langfang, Hebei, 065001, China.
² International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

PMID: 34243380
DOI: 10.1063/5.0040636

Abstract

A tangential hard x-ray (HXR) diagnostic on the newly constructed ENN XuanLong-50 (EXL-50) spherical tokamak for fast electron emission studies is presented. The HXR detection system consists of a symmetrical CdZnTe semiconductor detector array with a spectral sensitivity range of 20-300 keV. 25 channels have been designed on the 270° horizontal vacuum port with 12 sight lines to observe the forward emission, 12 sight lines to observe the backward emission of fast electrons, and 1 for viewing the central. Currently, ten channels have been in operation in the EXL-50 experiments. The systems are designed to measure the x-ray spectra for the estimation of fast electron temperature and electron velocity distribution in the EXL-50 experiment, which will be useful for understanding the dynamics of fast electrons generated by electron cyclotron resonance heating, for plasma instability and transport studies and for the analysis of plasma heating efficiency.