Development of electron cyclotron emission imaging system on the HL-2A tokamak.
Development of electron cyclotron emission imaging system on the HL-2A tokamak.
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DOI：
10.1063/1.4828671
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
M. Jiang;Z. Shi;S. Che;C. Domier;N. Luhmann;X. Hu;A. Spear;Z. T. Liu;X. Ding;J. Li
中科院分区：
文献类型：
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作者：
M. Jiang;Z. Shi;S. Che;C. Domier;N. Luhmann;X. Hu;A. Spear;Z. T. Liu;X. Ding;J. Li
本文介绍了一种用于HL-2A装置电子温度起伏测量的二维电子回旋发射成像系统。它由一个前端24通道外差成像阵列和一组后端ECEI电子设备组成，前端24通道外差成像阵列具有跨越75-110 GHz的可调谐RF范围，后端ECEI电子设备一起生成HL-2A等离子体的二次谐波X模式电子回旋辐射的24 × 8 = 192通道图像。给出了本地振荡器（LO）光学器件和射频（RF）光学器件的模拟性能以及实验室表征结果。观察到来自LO光学器件的高斯光束适当地覆盖整个检测器阵列。来自等离子体的ECE信号在阵列盒中与LO信号混合，然后通过低损耗微波电缆传输到电子系统，最后传输到数字化仪。ECEI系统的时间分辨率可达~μs，空间分辨率可达1cm（径向）和2cm（极向）。
A 2D electron cyclotron emission imaging (ECEI) system has been developed for measurement of electron temperature fluctuations in the HL-2A tokamak. It is comprised of a front-end 24 channel heterodyne imaging array with a tunable RF range spanning 75-110 GHz, and a set of back-end ECEI electronics that together generate 24 × 8 = 192 channel images of the 2nd harmonic X-mode electron cyclotron emission from the HL-2A plasma. The simulated performance of the local oscillator (LO) optics and radio frequency (RF) optics is presented, together with the laboratory characterization results. The Gaussian beams from the LO optics are observed to properly cover the entire detector array. The ECE signals from the plasma are mixed with the LO signal in the array box, then delivered to the electronics system by low-loss microwave cables, and finally to the digitizers. The ECEI system can achieve temporal resolutions of ~μs, and spatial resolutions of 1 cm (radially) and 2 cm (poloidally).