The Calibration of High-Speed Camera Imaging System for ELMs Observation on EAST Tokamak

FU Chao (付超); ZHONG Fangchuan (钟方川); HU Liqun (胡立群); YANG Jianhua (杨建华); YANG Zhendong (仰振东); GAN Kaifu (甘开福); ZHANG Bin (张斌); EAST Team

doi:10.1088/1009-0630/18/9/02

Plasma Science and Technology > 2016 > 18(9): 884-889. > DOI: 10.1088/1009-0630/18/9/02

FU Chao (付超), ZHONG Fangchuan (钟方川), HU Liqun (胡立群), YANG Jianhua (杨建华), YANG Zhendong (仰振东), GAN Kaifu (甘开福), ZHANG Bin (张斌), EAST Team. The Calibration of High-Speed Camera Imaging System for ELMs Observation on EAST Tokamak[J]. Plasma Science and Technology, 2016, 18(9): 884-889. DOI: 10.1088/1009-0630/18/9/02

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The Calibration of High-Speed Camera Imaging System for ELMs Observation on EAST Tokamak

1 College of Science, Donghua University, Shanghai 201620, China 2 Member of Magnetic Confinement Fusion Research Center, Ministry of Education, Shanghai 201620, China 3 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: supported by National Natural Science Foundation of China (No. 11275047), the National Magnetic Confinement Fusion Science Program of China (No. 2013GB102000)

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Received Date: December 03, 2015

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Abstract

Abstract

A tangential fast visible camera has been set up in EAST tokamak for the study of edge MHD instabilities such as ELM. To determine the 3-D information from CCD images, Tsai’s two-stage technique was utilized to calibrate the high-speed camera imaging system for ELM study. By applying tiles of the passive stabilizers in the tokamak device as the calibration pattern, transformation parameters for transforming from a 3-D world coordinate system to a 2-D image coordinate system were obtained, including the rotation matrix, the translation vector, the focal length and the lens distortion. The calibration errors were estimated and the results indicate the reliability of the method used for the camera imaging system. Through the calibration, some information about ELM filaments, such as positions and velocities were obtained from images of H-mode CCD videos.
- CCD,
- calibration,
- H-mode,
- ELM,
- filamentary structure,
- high-speed camera

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