A plasma radiation measurement system for a wide spectral range, based on compact Absolute eXtreme UltraViolet (AXUV) silicon photodiodes, has been implemented on the newly constructed ENN XuanLong-50 (EXL-50) spherical tokamak. The system consists of two 16-channel AXUV16ELG arrays and one AXUV63HS1 single-cell detector mounted on ceramic sockets. The two arrays, facing toward the EXL-50 slim central post from two locations inside a top and a side ConFlat 400 port, have 32 view chords covering the interested plasma region in a poloidal cross section at toroidal 330°. The single-cell detector, seated on a retractable feedthrough, could be arranged flexibly with the help of an ultra-high vacuum compatible gate valve. The design details together with considerations on the EXL-50 specific engineering realities and physics requirements are described. Preliminary results from the EXL-50 2020 experimental campaign are presented.
Time resolved absolute extreme ultraviolet radiation measurement on the ENN XuanLong-50 spherical tokamak
Note: Paper published as part of the Special Topic on Proceedings of the 23rd Topical Conference on High-Temperature Plasma Diagnostics.
L. L. Dai, Y. B. Zhu, R. H. Bai, Q. Li, R. Y. Tao, L. C. Liu, J. B. Ding, F. Ma, X. Zhao, S. K. Cheng, X. L. Huang, M. S. Liu; Time resolved absolute extreme ultraviolet radiation measurement on the ENN XuanLong-50 spherical tokamak. Rev. Sci. Instrum. 1 August 2021; 92 (8): 083507. https://doi.org/10.1063/5.0040648
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