Two-dimensional vacuum ultraviolet images in different MHD events on the EAST tokamak

摘要

A high-speed vacuum ultraviolet(VUV) imaging telescope system has been developed to measure the edge plasma emission(including the pedestal region) in the Experimental Advanced Superconducting Tokamak(EAST).The key optics of the high-speed VUV imaging system consists of three parts:an inverse Schwarzschild-type telescope,a micro-channel plate(MCP)and a visible imaging high-speed camera.The VUV imaging system has been operated routinely in the 2016 EAST experiment campaign.The dynamics of the two-dimensional(2 D) images of magnetohydrodynamic(MHD) instabilities,such as edge localized modes(ELMs),tearing-like modes and disruptions,have been observed using this system.The related VUV images are presented in this paper,and it indicates the VUV imaging system is a potential tool which can be applied successfully in various plasma conditions.