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Parametric analysis of asymmetric vertical displacement events at JET

V Riccardo, S Walker, P Noll2000年Plasma Physics and Controlled FusionIF 2.2出版社

A small fraction of plasma disruptions at JET lead to a significant horizontal displacement in the vacuum vessel. This can threaten the integrity of the vessel and, in particular, of various vessel attachments such as the main vertical ports and the neutral injector boxes. These events are referred to as asymmetric vertical disruption events (AVDEs). In this paper we attempt to identify associations between plasma parameters and large asymmetric vessel displacements by analysis of data from some hundreds of disruptive JET pulses. As far as the pre-disruption parameters are concerned, the amplitude of sideways vessel displacements shows a trend with the boundary safety factor and the poloidal beta. No link has been identified with the plasma triangularity or elongation. With regard to plasma parameters during the disruption, the data show a trend with the amplitude of the instability mode n= 1, and a trend with the plasma current quench rate and the minimum value of the boundary safety factor. A reliable short cut to select disruptions with high asymmetric loads and to estimate the effects on the vessel using disruption data has been proposed. Hardly any practical operational space has been found to be wholly safe from triggering such sideways vessel displacements.

日本語訳

JETにおける少数のプラズマディスラプションは、真空容器内で有意な水平変位を引き起こす。これは、容器の完全性、特に主垂直ポートや中性粒子入射ボックスなどの様々な容器付属部品を脅かす可能性がある。これらの事象は、非対称垂直ディスラプション事象(AVDEs)と呼ばれる。本論文では、数百回のJETディスラプションパルスのデータ解析を通じて、プラズマパラメータと大きな非対称容器変位との間の関連性を特定することを試みる。ディスラプション前のパラメータに関しては、側方容器変位の振幅は、境界安全係数およびポロイダルベータとの相関傾向を示す。プラズマの三角形度または伸長度との明確な関連は確認されなかった。ディスラプション中のプラズマパラメータに関しては、データは、不安定性モードn=1の振幅、プラズマ電流クエンチ率、および境界安全係数の最小値との相関傾向を示す。ディスラプションデータを用いて、高い非対称荷重を伴うディスラプションを選択し、容器への影響を評価するための信頼性の高い簡便手法が提案されている。このような側方容器変位を引き起こすディスラプションを完全に回避できる実用的な運転領域は、ほとんど存在しないことが明らかになった。

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