We have investigated ohmic plasma initiation for JA DEMO, a design concept of the tokamak demonstration fusion reactor examined in Japan. A calculation model describing the tokamak plasma initiation phase consisting of the two-dimensional analysis of the coil and eddy currents and the zero-dimensional plasma analysis is developed. It is revealed that the conducting shell does not necessarily hinder plasma initiation, while it provides the stabilizing effect of vertical displacement events. The available loop voltage and prefill gas pressure for initiation in JA DEMO are clarified for developing the initiation scenario. We demonstrate a possible scenario of ohmic plasma initiation, which is consistent with the design specifications of superconducting poloidal field coils.

中文翻译：

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JA DEMO 欧姆等离子体引发研究

我们研究了 JA DEMO 的欧姆等离子体引发，JA DEMO 是日本检查的托卡马克示范聚变反应堆的设计概念。开发了描述托卡马克等离子体起始阶段的计算模型，该模型由线圈和涡流的二维分析以及零维等离子体分析组成。结果表明，导电壳不一定会阻碍等离子体的引发，但它提供了垂直位移事件的稳定作用。JA DEMO 中阐明了用于启动的可用回路电压和预填充气体压力，以用于开发启动场景。我们演示了欧姆等离子体引发的可能情况，这与超导极向场线圈的设计规范一致。