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Aspects of steady-state operation of the Wendelstein 7-X stellarator

J Geiger, R C Wolf, C Beidler, A Cardella, E Chlechowitz, V Erckmann, G Gantenbein, D Hathiramani, M Hirsch, W Kasparek2013年Plasma Physics and Controlled FusionIF 2.2出版社

The objective of Wendelstein 7-X is to demonstrate steady-state operation at β -values of up to 5%, at ion temperatures of several keV and plasma densities of up to 2 × 1020 m−3. The second operational phase foresees a fully steady-state high heat flux (HHF) divertor. Preparations are underway to cope with residual bootstrap currents, either by electron cyclotron current drive or by HHF protection elements. The main steady-state heating system is an electron cyclotron resonance heating facility. Various technical improvements of the gyrotrons have been implemented recently. They enable a reliable operation at the 1 MW power level. Some of the technical issues preparing plasma diagnostics for steady-state operation are exemplified. This includes the protection against non-absorbed microwave radiation.

日本語訳

Wendelstein 7-Xの目的は、β値が最大5%、イオン温度が数keV、プラズマ密度が最大2×10^20 m^-3での定常運転を実証することである。第二運転フェーズでは、完全定常状態の高熱流束(HHF)ダイバータが計画されている。残留ブートストラップ電流に対処するための準備が進められており、電子サイクロトロン電流駆動またはHHF保護要素のいずれかを用いる。主たる定常加熱システムは電子サイクロトロン共鳴加熱装置である。ジャイロトロンの技術的改良が最近実施され、1 MWレベルでの信頼性の高い運転が可能となった。定常運転に向けたプラズマ診断の準備における技術的課題のいくつかが例示されている。これには、非吸収マイクロ波放射に対する保護が含まれる。

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