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首页> 外文期刊>Plasma and Fusion Research >Development of an Array System of Soft X-ray Detectors with Large Sensitive Area on the Large Helical Device
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Development of an Array System of Soft X-ray Detectors with Large Sensitive Area on the Large Helical Device

机译：大型螺旋装置上具有大灵敏度区域的软X射线探测器阵列系统的开发

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A new 17-channel soft X-ray diagnostic system was developed for a study of magnetohydrodynamics (MHD) fluctuations and installed on the Large Helical Device (LHD). The Absolute X-ray Ultraviolet Photodiodes (AXUV diode) with a large sensitivity area 10 mm × 10 mm were adopted as the detectors. The sightlines were designed to cover the whole plasma with 3.8 cm space separation and the expected radial resolution was 7 cm at the equatorial plane of LHD. The toroidally elongated pin hole (25 mm × 7 mm) was used to increase the signal to noise ratio and a Be foil of 15 μm in thickness was used to shut the visible light. The detector array was placed inside the vertically elongated section of the LHD vacuum vessel, being shielded by an aluminum box. In the experimental campaign of LHD, this fiscal year 2011, various kinds of MHD fluctuations excited in core and edge plasma regions have clearly been detected by this newly installed diagnostic system. The characteristic behaviors of the ELM activity in H-mode plasmas and the “Fishbone”-like instabilities induced by the perpendicular neutral beam injection (NBI) were derived from the soft X-ray data.
机译：开发了一种新的17通道软X射线诊断系统，用于研究磁流体动力学（MHD）波动，并安装在大型螺旋装置（LHD）上。检测器采用灵敏度范围为10 mm×10 mm的绝对X射线紫外线光电二极管（AXUV二极管）。视线被设计为以3.8 cm的空间间隔覆盖整个等离子体，并且在LHD的赤道平面上预期的径向分辨率为7 cm。使用环形细长的针孔（25 mm×7 mm）来提高信噪比，并使用厚度为15μm的Be箔片封闭可见光。将检测器阵列放置在LHD真空容器的垂直拉长部分内，并用铝箱屏蔽。在2011财年的LHD实验活动中，通过新安装的诊断系统可以清楚地检测到在核心和边缘等离子体区域激发的各种MHD波动。从软X射线数据得出H型等离子体中ELM活性的特征行为以及由垂直中性束注入（NBI）引起的“鱼骨”状不稳定性。

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