EAST高时空分辨极向弯晶谱仪系统的升级及初步实验结果

Upgrade and first experimental results of high temporal and spatial resolution poloidal X-ray crystal spectrometer in EAST

为了拓宽等离子体参数测量范围,对EAST极向弯晶谱仪(PXCS)进行了升级改造。配合高通量大面积水冷固体探测器,提高了极向弯晶谱仪系统的光子计数率、时间分辨率、空间探测范围以及长时间运行稳定性,并在EAST装置上成功运行。实验结果表明,升级后的谱仪获得了高信噪比的类氦氩离子的母线及其一系列伴线谱,通过光谱拟合分析给出了等离子体温度时间演化及其剖面信息,测量结果与切向弯晶谱仪的数据一致,验证了极向弯晶谱仪的升级结果和数据测量的可靠性,并且在EAST长脉冲实验运行也能够稳定地提供全时间的参数分布。

To increase the area of measurement, improve the temporal-spatial resolution, and enhance the stability of long time operation, poloidal X-ray crystal spectrometer(PXCS) has been upgraded in EAST. A new larger pixelated two-dimensional detector was used in poloidal system. With spatial calibration, more area of plasma can be measured. Water cooling system was deployed to keep the detector within working temperature in vacuum environment. EAST experimental results showed that high signal-noise ratio He-like argon ions spectra were successfully obtained by upgraded PXCS system. Argon ions temperature calculated by PXCS showed good agreement with results from toroidal X-ray crystal spectrometer(TXCS) for both temporal evolution and profiles. Also PXCS system has been proved to have capability to work consistently and steadily in long-pulse discharges. Upgrade of PXCS on EAST was successful. Results in EAST campaign validated the stability and reliability of the new PXCS system.