Infrared Imaging Bolometer for the HL-2A Tokamak

GAO Jinming (高金明); LI Wei (李伟); LU Jie (卢杰); XIA Zhiwei (夏志伟); YI Ping (易萍); LIU Yi (刘仪); YANG Qingwei (杨青巍); HL-A Team

doi:10.1088/1009-0630/18/6/02

Plasma Science and Technology > 2016 > 18(6): 590-594. > DOI: 10.1088/1009-0630/18/6/02

GAO Jinming (高金明), LI Wei (李伟), LU Jie (卢杰), XIA Zhiwei (夏志伟), YI Ping (易萍), LIU Yi (刘仪), YANG Qingwei (杨青巍), HL-A Team. Infrared Imaging Bolometer for the HL-2A Tokamak[J]. Plasma Science and Technology, 2016, 18(6): 590-594. DOI: 10.1088/1009-0630/18/6/02

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Infrared Imaging Bolometer for the HL-2A Tokamak

Southwestern Institute of Physics, Chengdu 610041, China

Funds: supported by National Natural Science Foundation of China (Nos. 10805016 and 11175061), and the Chinese National Fusion Project for ITER (No. 2014GB109001)

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Received Date: March 14, 2015

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Abstract

Abstract

An infrared imaging bolometer diagnostic has been upgraded recently to be adapted for the complications of the signal-to-noise ratio arising from the low level of plasma radiation and high reflectivity of low energy photon (<6.2 eV). It utilizes a platinum foil, blackened on both sides with graphite spray, as the bolometer detector. The advantage of the blackened foil is the light absorption extending into the infrared. After a careful calibration of the foil, the incident power density distribution on the foil is determined by solving the heat diffusion equation with a numerical technique. The local plasma radiated power density is reconstructed with a minimum fisher information regularization method by assuming plasma emission toroidal symmetry. Com?parisons of the results and the profiles measured by an ordinary bolometric detector demonstrate that this method is good enough to provide the plasma radiated power pattern. The typical plasma radiated power density distribution before and after high mode (H-mode) transition is firstly reconstructed with the infrared imaging bolometer. Moreover, during supersonic molecular beam injection (SMBI), an enhanced radiation region is observed at the edge of the plasma.
- infrared imaging bolometer,
- tomography,
- plasma radiated power pattern

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Infrared Imaging Bolometer for the HL-2A Tokamak