Applications of Visible Imaging Diagnostics on EAST Tokamak

Three visible imaging diagnostic systems have been installed on EAST tokamak for several different diagnostic purposes. One is a high-speed camera system that can be operated to study edge plasma phenomena with a maximum recording speed of 16 kfps and a minimum exposure time of 1 µs. The other two systems have color cameras that are used by machine operators to monitor the discharge process including plasma shape, position, movement, and interaction with the device wall. A newly developed wide-view optics subsystem has been introduced into the imaging diagnostic system to transmit the plasma visible light to the outside of the device so that the camera can be installed outside, ensuring the safe and reliable functioning of the imaging diagnostic system. To match the optics, upgrades of the imaging acquisition and storage subsystem have been made to obtain both high temporal and high spatial resolutions in plasma imaging. In this paper, the design and results obtained during operations of the new visible imaging diagnostic systems are described using images of EAST tokamak plasma discharges during the recent plasma campaign.