Abstract
The controlling of plasma shape and position are essential to the success of Tokamak discharge. A real-time image acquisition system was designed to obtain plasma radiation image during the discharge processes in the Experimental Advanced Superconducting Tokamak (EAST) device. The hardware structure and software design of this visible camera system are introduced in detail. According to the general structure of EAST and the layout of the observation window, spatial location of the discharging plasma in the image was measured. An improved Sobel edge detection algorithm using iterative threshold was proposed to detect plasma boundary. EAST discharge results show that the proposed method acquired plasma position and boundary with high accuracy, which is of great significance for better plasma control.
Highlights
The Experimental Advanced Superconducting Tokamak (EAST) was built by the Institute of Plasma Physics, Chinese Academy of Sciences, which aims at the demonstration of long pulse stable high-performance plasma operation, and provides an important test bed to address key physics and technology issues for next-step fusion devices (Wan 2009; Wan et al 2013)
We proposed an improved threshold algorithm, which can select different threshold based on image features during plasma discharge
In comparison with the Gap inversed by EFIT, the Gap obtained by the plasma image processing is very close to the inversed Gap by EFIT
Summary
A fast visible camera, as a kind of imaging device, can obtain the radiation images in real-time during the plasma discharge (Jia et al 2015; Yuan et al 2013; Chapman et al 2014). A Sobel edge detection method with improved iterative thresholding algorithm was proposed in real-time plasma boundary detection.
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