Electromagnetic analyses on radial field sector coils for JT-60SA

JT-60SAの径方向磁場生成コイルの電磁気解析

Ferro, A.*; Gaio, E.*; 武智 学; 松川 誠

Ferro, A.*; Gaio, E.*; Takechi, Manabu; Matsukawa, Makoto

JT-60SAにおいて定常高ベータ運転を行うには抵抗性壁モード(RWM)の安定化が必須である。そのため、JT-60SAには真空容器内に安定化板とRWM制御コイルが設置される予定である。この論文ではこのRWM制御コイルの電磁気解析を行うことにより、コイルの生成する磁場の強さや分布を調べ、必要な電圧や電流値等の評価を行う。また、ディスラプションやVDE時の誘起電流を示す。これらの結果はRWM制御コイルとその電源の設計の進展の指針となる。

In JT-60SA, to achieve the steady-state high beta plasma, suppression of Resistive Wall Modes (RWM) is necessary. Therefore, a passive stabilizing plate and a RWM active control system based on in-vessel coils are foreseen for JT-60SA. This paper deals with the electromagnetic analyses on the sector coils of JT-60SA, with the main aim to determine the voltage/current characteristic of the coils and, at the same time, to have a first estimation of amplitude and shape of the produced magnetic field; different sector coil design solutions were considered and evaluated. The studies on the coil over-currents during plasma disruption or vertical displacement events are also presented. The results give useful indications in support to the development of the sector coils and power supply design and the identification of their electrical and functional requirements.