国立研究開発法人量子科学技術研究開発機構核融合エネルギー研究開発部門那珂核融合研究所トカマクシステム技術開発部National Institutes for Quantum and Radiological Science and Technology ◇ 311–0193 茨城県那珂市向山801–1 ◇ 801–1 Mukoyama, Naka-shi, Ibaraki Pref. 311–0193, Japan
大型トカマク装置の磁場コイル電源には，数十kA/数kVの直流電源が必要である。高電圧はプラズマ着火時のみ必要で，その後は比較的低電圧で十分のため，合理的設計が求められる。また超伝導コイルを用いる最近の装置では，コイルの損傷を回避するため，数GJから数十GJの磁気エネルギーを急速に開放する保護回路が必要である。本稿では，現在建設中のJT-60SAを例に，直流電源とコイル保護回路の特徴を述べる。
In large tokamak device, high current DC power supply several tens of kA/several kV has been used for magnet excitation. During tokamak operation, high voltage is needed for only short time at plasma initiation. Therefore, cost-effective circuit topology combined with thyristor converters and DC circuit breakers has been discussed for many years. In addition, the latest superconducting tokamak stores huge magnetic energy(～10 GJ) especially in toroidal field coils. In the case of coil quench, protection circuit has to discharge the magnetic energy by using external resistors in order to prevent coil damage. This paper describes an optimized magnet power supply system of JT-60SA which is one of the largest superconducting tokamak and being constructed in Japan.
Key words: JT-60SA; superconducting magnet; power supply; quench protection; flywheel motor-generator
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