Preliminary results of the 105 GHz collective Thomson scattering system on HL-2A

W C Deng; Z B Shi; P W Shi; Z C Yang; W Chen; M Huang; F Zhang; X Yu; M Jiang; J Wen; A S Liang; Y Q Shen; Y Zhou; R H Tong; W L Zhong

doi:10.1063/5.0150123

Preliminary results of the 105 GHz collective Thomson scattering system on HL-2A

Rev Sci Instrum. 2023 Sep 1;94(9):094701. doi: 10.1063/5.0150123.

Authors

W C Deng¹, Z B Shi¹, P W Shi¹, Z C Yang¹, W Chen¹, M Huang¹, F Zhang¹, X Yu¹, M Jiang¹, J Wen¹, A S Liang¹, Y Q Shen¹, Y Zhou¹, R H Tong¹, W L Zhong¹

Affiliation

¹ Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.

PMID: 37668510
DOI: 10.1063/5.0150123

Abstract

A 105 GHz collective Thomson scattering (CTS) diagnostic has been successfully developed for fast-ion measurements on the HL-2A tokamak, and it has been deployed during an experimental campaign. Enhanced signals exhibiting synchronous modulation characteristics have been observed across all CTS channels upon the launch of a modulated probe wave. Results show that the intensity of the CTS signal increases with Neutral Beam Injection (NBI) power and is proportional to neutron count, indicating that the scattering signal contains a contribution from fast ions. Compared with the signal without NBI, the enhanced scattering spectrum due to NBI is slightly wider than the predicted fast ion range. Such broadening might be attributed to the heating effects of the gyrotron.