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Investigating the thermal stability of highly radiative discharges on JET with a new tomographic method

A. Murari, E. Peluso, T. Craciunescu, C. Lowry, S. Aleiferis, P. Carvalho, M. Gelfusa, JET Contributors2020年被引用 14Nuclear FusionIF 3出版社

The next generation of Tokamak devices is expected to work at very high radiated fractions, well above 90%, to preserve the integrity of the plasma facing components in general and the divertor in particular. In addition to maintaining high confinement, these configurations will also have to guarantee a low disruptivity. An accurate determination of the emitted radiation will therefore become increasingly important, not only for the global power balances but also for specific regions of the plasma cross section (for example to properly control detachment). In this perspective, a new tomographic inversion method, based on the maximum likelihood (ML) approach, capable of providing routinely confidence intervals in the estimates of the radiated power, has been applied to the investigation of high radiative discharges on JET with the ITER like wall (ILW). The emission has been increased with injection of extrinsic impurities. Taking into account all the major sources of uncertainties, a systematic analysis of the configurations has shown that it has not been possible to develop stable configurations with radiated fraction higher than 70% of the input power. At higher radiated fractions the discharges always disrupt. Therefore significant work remains to be done to extend JET operation in a reactor relevant regime of sufficient radiation in preparation for ITER and DEMO.

日本語訳

次世代のトカマク装置は、プラズマ対向機器全般、特にダイバータの完全性を保つために、90%をはるかに超える非常に高い放射割合で動作することが期待されている。高い閉じ込めを維持することに加えて、これらの構成は低いディスラプション率を保証しなければならない。したがって、放出される放射の正確な決定は、全体のパワーバランスだけでなく、プラズマ断面の特定領域(例えば、デタッチメントを適切に制御するため)にとってもますます重要になる。この観点から、最尤(ML)アプローチに基づく新しいトモグラフィ逆変換法が、放射パワーの推定において日常的に信頼区間を提供できるものであり、ITER類似壁(ILW)を備えたJETにおける高放射放電の調査に適用された。放射は外部不純物の注入によって増加された。不確実性の主要な原因をすべて考慮すると、構成の系統的分析により、入力パワーの70%を超える放射割合を持つ安定した構成を開発することは不可能であることが示された。より高い放射割合では、放電は常にディスラプションを起こす。したがって、ITERとDEMOに備えて、十分な放射を伴う炉心関連領域でのJET運転を拡張するために、重要な作業がまだ残されている。

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