Jun Jiang, Yingying Li, Ran Chen, J. Fu, Bo Lyu, Yi Yu, Guosheng Xu, Minyou Ye
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Abstract
An ultra-fast charge exchange recombination spectroscopy (UF-CXRS) has been developed on EAST tokamak (Yingying Li et al 2019 Fusion Eng. Des. 146 522-525) to measure fast evolution of ion temperature and toroidal velocity. Here we report the preliminary diagnostic measurements after relative sensitivity calibration. The measurement results show a much higher temporal resolution compared with conventional CXRS benefiting from the usage of a prism-coupled, high-dispersion VPH transmission grating and a high-quantum efficiency, high-gain detector array. Utilizing the UF-CXRS diagnostic, the fast evolutions of the ion temperature and rotation velocity during a set of high-frequency small-amplitude ELMs are obtained on the EAST tokamak, which are then compared with the case of large-amplitude ELMs.
在 EAST 托卡马克上开发了超快电荷交换重组光谱（UF-CXRS）（Yingying Li et al 2019 Fusion Eng. Des. 146 522-525），用于测量离子温度和环速的快速演变。在此，我们报告相对灵敏度校准后的初步诊断测量结果。测量结果表明，与传统的 CXRS 相比，UF-CXRS 具有更高的时间分辨率，这得益于它使用了棱镜耦合、高色散 VPH 传输光栅和高量子效率、高增益探测器阵列。利用 UF-CXRS 诊断，在 EAST 托卡马克上获得了一组高频小振幅 ELM 期间离子温度和旋转速度的快速演变，然后将其与大振幅 ELM 的情况进行比较。
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