Electron cyclotron emission radiometer upgrade on the J-TEXT tokamak

Z J Yang; X M Pan; X D Ma; B W Ruan; R B Zhou; C Zhang

doi:10.1063/1.4960167

Electron cyclotron emission radiometer upgrade on the J-TEXT tokamak

Rev Sci Instrum. 2016 Nov;87(11):11E112. doi: 10.1063/1.4960167.

Authors

Z J Yang¹, X M Pan¹, X D Ma¹, B W Ruan¹, R B Zhou¹, C Zhang¹

Affiliation

¹ State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.

PMID: 27910414
DOI: 10.1063/1.4960167

Abstract

To meet experimental requirements, the J-TEXT electron cyclotron emission (ECE) diagnostic is being upgraded. The front end antenna and transmission line have been modified and a new 8-channel W-band detecting unit has been developed. The improved ECE system will extend the frequency range from 94.5-124.5 GHz to 80.5-124.5 GHz. This will enable the system to cover the most plasma in the radius direction for B_T = 1.8-2.2 T, and it even can cover almost the whole plasma range ρ = - 0.8-0.9 (minus means the high field side) at B_T = 1.8 T. A new auxiliary channel bank with 8 narrow band, tunable yttrium iron garnet filters is planned to add to the ECE system. Due to observations along a major radius, perpendicular to B_T, and relatively low electron temperature, Doppler and relativistic broadening are minimal and thus high spatial resolution measurements can be made at variable locations with these tunable channels.