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Performance of the solid state neutral particle analyzer array on the national spherical torus experiment

NSTXにおける半導体中性粒子アナライザアレイの性能

Liu, D.*; Heidbrink, W. W.*; Darrow, D. S.*; Roquemore, A. L.*; Medley, S. S.*; 篠原 孝司

Liu, D.*; Heidbrink, W. W.*; Darrow, D. S.*; Roquemore, A. L.*; Medley, S. S.*; Shinohara, Koji

プリンストンプラズマ物理学研究所のNSTXの半導体検出器中性粒子アナライザアレイ(SSNPA)は正接半径がそれぞれ60, 90, 100, 120cmの4視線からなる。それぞれの視線はシリコンフォトダイオードを使用しており、荷電交換高速中性粒子のエネルギー分布を観測するべく、その信号は高速にサンプリングされている。電磁遮蔽,高速サンプリング,ソフトウェアベースの波高弁別解析によりSSNPAの性能は大幅に改善し、エネルギー分解能は約10keV、時間分解能は2msに達した。これによりMHDによる高速イオンの振る舞いの計測が可能になった。

The Solid State Neutral Particle Analyzer (SSNPA) array on the National Spherical Torus Experiment (NSTX) consists of four chords with tangency radii 60, 90, 100 and 120 cm that view across the three co-injection neutral beam lines. Each chord utilizes a silicon photodiode that is coupled to fast digitizers to measure the energy distribution of charge exchange fast neutral particles (30$$sim$$100keV). By the end of the NSTX 2005 run campaign, the noise in the SSNPA was reduced by half and reasonable signals were obtained with good electromagnetic shielding, fast digitization of raw signals, software-based pulse height analysis and pulse shape discrimination. Energy resolution of $$sim$$10 keV and time resolution of 2 ms have been achieved. Temporal evolutions of energetic neutral flux obtained with the SSNPA are in good agreement with those obtained with the E$$||$$B type Neutral Particle Analyzer. With these improvements, the SSNPA enables us to study MHD instabilities and fast ion redistribution.

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パーセンタイル:64.77

分野:Instruments & Instrumentation

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