会議発表用資料 Magnetically-guided liquid metal plasma facing components

嶋田, 道也

2017-11-21
内容記述
An innovative approach is proposed for the protection of plasma-facing surface of blankets, which will also serve as an automatic disruption mitigation system. In a strong magnetic field, liquid metal is frozen in the magnetic field. This property enables liquid metal to flow along the field line. In a divertor configuration with a lower single-null, a second separatrix exists above the plasma. Toroidally-continuous liquid metal sheets, poured through a toroidal slot located radially outside the 2nd separatrix flux surface, move along the field line, absorbing heat and particles, reach the divertor at a glancing angle. At the current quench in a disruption, toroidal current is induced automatically in the liquid metal surrounding the core plasma. The resultant j × B force pushes the liquid metal toward the core plasma, significantly mitigating the heat load and force on the first wall and the divertor. Use of magnetically-guided liquid metal PFC would also eliminate the need of fine shaping and toroidal alignment of the first wall. The wall conditioning is done automatically during the discharge. Use of lithium-containing liquid metal (e.g. LiSn) would facilitate tritium breeding.
Plasma Conference 2017

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