在实验先进超导托卡马克装置上具有上下对称性的新型双气体脉冲成像系统。

New dual gas puff imaging system with up-down symmetry on experimental advanced superconducting tokamak.

作者信息

Liu S C, Shao L M, Zweben S J, Xu G S, Guo H Y, Cao B, Wang H Q, Wang L, Yan N, Xia S B, Zhang W, Chen R, Chen L, Ding S Y, Xiong H, Zhao Y, Wan B N, Gong X Z, Gao X

机构信息

Institute of Plasma Physics, Chinese Academy of Science, P. O. Box 1126, Hefei 230031, China.

出版信息

Rev Sci Instrum. 2012 Dec;83(12):123506. doi: 10.1063/1.4770122.

DOI:10.1063/1.4770122

PMID:23277986

Abstract

Gas puff imaging (GPI) offers a direct and effective diagnostic to measure the edge turbulence structure and velocity in the edge plasma, which closely relates to edge transport and instability in tokamaks. A dual GPI diagnostic system has been installed on the low field side on experimental advanced superconducting tokamak (EAST). The two views are up-down symmetric about the midplane and separated by a toroidal angle of 66.6°. A linear manifold with 16 holes apart by 10 mm is used to form helium gas cloud at the 130×130 mm (radial versus poloidal) objective plane. A fast camera is used to capture the light emission from the image plane with a speed up to 390,804 frames/s with 64×64 pixels and an exposure time of 2.156 μs. The spatial resolution of the system is 2 mm at the objective plane. A total amount of 200 Pa.L helium gas is puffed into the plasma edge for each GPI viewing region for about 250 ms. The new GPI diagnostic has been applied on EAST for the first time during the recent experimental campaign under various plasma conditions, including ohmic, L-mode, and type-I, and type-III ELMy H-modes. Some of these initial experimental results are also presented.

摘要

喷气成像（GPI）为测量边缘等离子体中的边缘湍流结构和速度提供了一种直接且有效的诊断方法，这与托卡马克装置中的边缘输运和不稳定性密切相关。一个双GPI诊断系统已安装在实验先进超导托卡马克（EAST）的低场侧。这两个视图关于中平面上下对称，且相隔66.6°的环向角。一个具有16个间距为10毫米的孔的线性阵列用于在130×130毫米（径向与极向）的物平面上形成氦气云。一台高速相机用于以高达390,804帧/秒的速度捕捉图像平面的光发射，相机具有64×64像素，曝光时间为2.156微秒。该系统在物平面的空间分辨率为2毫米。对于每个GPI观测区域，向等离子体边缘喷入总量为200帕·升的氦气，持续约250毫秒。在最近的实验期间，新的GPI诊断首次在EAST上应用于各种等离子体条件下，包括欧姆加热、低杂波电流驱动（L模）以及I型和III型边缘局域模（ELM）的高约束（H模）。本文还展示了一些这些初步实验结果。