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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Initial Plasma Production by Townsend Avalanche Breakdown on QUEST Tokamak
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Initial Plasma Production by Townsend Avalanche Breakdown on QUEST Tokamak

机译：Townsend Avalanche在QUEST Tokamak上的初步等离子生产

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摘要

On tokamak devices, an induction electric field induced by poloidal field (PF) coils plays a role to produce initial plasma. On a DIII-D tokamak, the required induction electric field for plasma breakdown agrees well with theoretical predictions based on the Townsend avalanche theory. According to the Townsend avalanche theory, the minimum induction electric field for plasma breakdown depends on neutral gas pressure and connection length. For stable plasma breakdown, a sufficiently large induction electric field is required. However, in the case of spherical tokamaks without electric insulation in the toroidal direction, the effect of eddy currents flowing in the toroidal direction should be considered in evaluating a feasible induction electric field because this effect suppresses the generation of an induction electric field. On a QUEST spherical tokamak, the possibility of Townsend avalanche breakdown is studied by evaluating the connection length and achievable induction electric field. The connection length is greater than 100 m in the case where a null point is set to be R = 0.56 m with a CS coil current of 2.0 kA and a PF26 coil current of 0.4 kA. Moreover, the induction electric field is about 1.5 V at this point including the effect of eddy currents. With these values, the initial plasma production by the induction electric field is sufficiently possible on QUEST.
机译：在托卡马克装置上，由极向场（PF）线圈感应的感应电场起着产生初始等离子体的作用。在DIII-D托卡马克上，等离子体击穿所需的感应电场与基于Townsend雪崩理论的理论预测非常吻合。根据汤森（Townsend）雪崩理论，等离子体击穿的最小感应电场取决于中性气体压力和连接长度。为了稳定的等离子体击穿，需要足够大的感应电场。然而，在球形托卡马克在环形方向上没有电绝缘的情况下，在评估可行的感应电场时应考虑在环形方向上流动的涡电流的影响，因为这种作用抑制了感应电场的产生。在QUEST球形托卡马克上，通过评估连接长度和可达到的感应电场，研究了Townsend雪崩击穿的可能性。在CS线圈电流为2.0 kA，PF26线圈电流为0.4 kA的情况下，将零点设置为R = 0.56 m的情况下，连接长度大于100 m。此外，这时的感应电场约为1.5 V，包括涡流的影响。使用这些值，在QUEST上通过感应电场产生的初始等离子体是足够可能的。

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