Speaker
Description
Abstract—A vertical single channel 0.65THz solid-source interferometer (SSI) has been established on Experimental Advanced Superconducting Tokamak (EAST) for real-time electron density measurement and feedback. A novel terahertz line array detection scheme is proposed to improve the spatial resolution of the SSI. By employing high-power solid-state diode sources and an AlGaN/GaN line array high electron mobility transistors (HEMT) detector with high integration and good sensitivity, five channels will be added to obtain more spatial information of plasma. The line array HEMT detector is installed on the SSI system and the line-integrated density signals of three channels are obtained in the initial commissioning operation. The density measurement is implemented with IF 0.85 MHz, in a plasma with Ip = 400 kA and PECRH = 1.1 MW on EAST. The line array detector also detects the density frequency disturbance during the plasma discharge, which shows a good ability to study small-scale spatial MHD phenomena. Further engineering commissioning and subsequent data processing algorithms are still expected to optimize the measurement results of the line array detection scheme.
