| Citation: |
Dengfeng XU, Mei HUANG, Xixuan CHEN, Feng ZHANG, Donghui XIA, Zhijiang WANG, Yuan PAN. Investigation of gyrotron-based collective Thomson scattering for fast ion diagnostics in a compact high-field tokamak[J]. Plasma Science and Technology, 2023, 25(6): 064002. DOI: 10.1088/2058-6272/acb31f
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As a promising method for fast ion diagnostics, collective Thomson scattering (CTS) can measure the one-dimensional velocity distribution of fast ions with high spatial and temporal resolution. The feasibility of diagnosing fast ions in a compact high-field tokamak by CTS was studied in this work, and the results showed that a wide range of probing frequencies could be applied. A high-frequency case and a low-frequency case were mainly considered for fast ion diagnostics in a compact high-field tokamak. The use of a high probing frequency could effectively avoid the refraction effect of the beams, while the application of a low probing frequency allows greater flexibility in the selection of scattering angle which may help to improve the spatial resolution. Based on typical plasma conditions (B0 = 12.2 T, ne0 = 4.3 × 1020 m−3, Te0 = 22.2 keV, Ti0 = 19.8 keV) for a compact high-field tokamak, a 220 GHz CTS diagnostic that utilizes a small scattering angle of θ = 30° and a 160 GHz CTS diagnostic that utilizes an orthogonal geometry were proposed. Further study showed that the high-frequency case could operate in a wider range of plasma conditions and provide more information on fast ions while the low-frequency case could achieve higher spatial resolution of the poloidal direction.
This work is supported by the National MCF Energy R & D Program of China (No. 2019YFE03020003), and partly supported by the Key Research and Development Program of Hubei Province (No. 2021BAA167) and National Natural Science Foundation of China (No. 51821005). The authors would like to thank the ECRH group of the auxiliary heating department at SWIP as well as the J-TEXT laboratory for their assistance.
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