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Electron pressure measurements in the outer region of RFX-mod with the upgraded edge Thomson scattering diagnostic

A Alfier, A Fassina, F Auriemma, G Spizzo, R Pasqualotto2010年Plasma Physics and Controlled FusionIF 2.2出版社

The edge Thomson scattering (edge TS) diagnostic has been used during the last experimental campaign on the modified reversed field experiment (RFX-mod) under various plasma conditions. The optical system for spectral analysis has been modified with respect to the initial design to improve sensitivity: now it resembles the scheme of the main Thomson scattering (main TS) which includes optical delay lines, filter polychromators with APDs and waveform digitizers. The system so configured has proved to be reliable and to fulfil the experimental requirements. The spatial resolution is now 2 cm, with six measuring points in the outer plasma region at 0.7 < r/a < 1, which is only partially covered by the main TS, up to r/a < 0.8. The time synchronization of main and edge TS systems provides a full coverage of the plasma diameter and a complete pressure profile. Alternatively, the operation of the two systems with a controlled time delay allows two-time measurements of the evolution of edge Te, ne and pe profiles in transient events such as pellet injection or dynamo relaxations.

日本語訳

エッジトムソン散乱(エッジTS)診断は、改良型逆転磁場ピンチ装置(RFX-mod)における最近の実験キャンペーン中に、様々なプラズマ条件下で使用されてきた。分光システムは、感度を向上させるために初期設計から変更された。現在では、メインのトムソン散乱(メインTS)の構成と同様であり、光遅延線、APDを備えたフィルターポリクロメータ、および波形デジタイザを含む。このように構成されたシステムは、信頼性が高く、実験要件を満たすことが実証されている。空間分解能は現在2 cmであり、0.7 < r/a < 1の外側プラズマ領域に6つの測定点を有する。この領域は、メインTSによってr/a < 0.7までしか部分的にカバーされていない。メインTSとエッジTSの時間同期により、プラズマ直径全体のカバレッジと完全な圧力プロファイルが提供される。あるいは、制御された時間遅延を伴う2つのシステムの動作により、ペレット入射やダイナモ緩和などの過渡現象におけるエッジTe、ne、および圧力プロファイルの時間発展の2時刻測定が可能となる。

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Plasma diagnosticsThomson scatteringRFXScattering diagnostic
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