Development of ECE/ECEI diagnostics and MHD-related studies on HL-2A tokamak

Development of ECE/ECEI diagnostics and MHD-related studies on HL-2A tokamak
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HL-2A 托卡马克 ECE/ECEI 诊断和 MHD 相关研究的发展

DOI:
10.1051/epjconf/201920303014
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发表时间:
2019
影响因子:
--
通讯作者:
Yang Q. W.
Yang Q. W.
中科院分区:
--
文献类型:
--
作者:
Yang Z. C.;Jiang M.;Shi Z. B.;Ding X. T.;Luhmann N. C.;Zhong W. L.;Chen W.;Shi P. W.;Xu Y.;Wen J.;Liang A. S.;Liu Y.;Yang Q. W.

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设计了一种用于HL-2A装置电子温度剖面测量的60通道电子回旋辐射计。该系统基于中频分频技术,具有工作频率范围宽(60 - 90 GHz)、时空分辨率高(3 µs,1 cm)的特点,可覆盖几乎整个等离子体区域。此外,还研制了一套用于研究二维电子温度起伏的电子回旋发射成像系统。它由几个前端准光学透镜,一个24通道外差成像阵列(具有跨越60−135 GHz的可调谐RF频率范围)和一组后端ECEI电子器件组成,这些电子器件共同产生HL-2A等离子体的二次谐波X模式电子回旋辐射的两个24×8阵列图像。由于有两个独立的本振源,测量区域可以灵活移动,并且还可以通过改变变焦镜头的位置来轻松调整视场。时间分辨率约为2.5 µs,可实现的空间分辨率为1 cm。ECE/ECEI诊断技术已被证明是研究HL-2A装置上MHD相关物理的有力工具,包括宏观MHD与微尺度湍流之间的多尺度相互作用。
A novel 60-channel electron cyclotron emission (ECE) radiometer has been designed and tested for the measurement of electron temperature profiles on the HL-2A tokamak. This system is based on the intermediate frequency division technique, and has the features of wide working frequency range (60−90 GHz) and high temporal-spatial resolution (3 µs, 1 cm), which covers almost the entire plasma region. Also, an electron cyclotron emission imaging (ECEI) system has been developed for studying two dimensional electron temperature fluctuations. It is comprised of several front-end quasi-optical lenses, a 24 channel heterodyne imaging array with a tunable RF frequency range spanning 60−135 GHz, and a set of back-end ECEI electronics that together generate two 24×8 array images of the 2nd harmonic X-mode electron cyclotron emission from the HL-2A plasma. The measurement region can be flexibly shifted due to two independent local oscillator sources, and the field of view can be adjusted easily by changing the position of the zoom lenses as well. The temporal resolution is about 2.5 µs and the achievable spatial resolution is 1 cm. The ECE/ECEI diagnostics have been demonstrated to be powerful tools to study MHD-related physics including the multi-scale interaction between macro-scale MHD and micro-scale turbulence on the HL-2A tokamak.
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