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arXiv 1303.0146physics.plasm-ph
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MAST中共振磁扰动对连通双零等离子体ELM的影响

Effect of resonant magnetic perturbations on ELMs in connected double null plasmas in MAST

A. Kirk, Yueqiang Liu, I. T. Chapman, J. Harrison, E. Nardon, R. Scannell, A. J. Thornton, the MAST team

摘要:

在MAST托卡马克装置中,将环形模数n=3的共振磁扰动(RMP)应用于连接的双零等离子体,可使边缘局域模(ELM)频率增加9倍,并使I型ELM的等离子体能量损失减少9倍。观察到ELM缓解的阈值电流,高于该阈值电流,ELM频率随着线圈中的电流近似线性地增加。RMP的效果被认为是场景依赖。在一种情况下,缓解仅归因于大密度泵出事件,并且如果通过气体抽吸恢复密度,则观察到返回到I型ELM。在另一种情况下,可实现持续的ELM缓解,而不管燃料的量。尽管对参数进行了大量扫描,但尚未实现完全ELM抑制。结果进行了比较,使用真空近似或包括等离子体响应进行建模。谐振条件的要求,即与等离子体的扰动的最佳对准,已被确认通过执行扫描的所施加的场的俯仰角。

英文摘要:

The application of resonant magnetic perturbations (RMPs) with a toroidal mode number of n=3 to connected double null plasmas in the MAST tokamak produces up to a factor of 9 increase in Edge Localized Mode (ELM) frequency and reduction in plasma energy loss associated with type-I ELMs. A threshold current for ELM mitigation is observed above which the ELM frequency increases approximately linearly with current in the coils. The effect of the RMPs is found to be scenario dependent. In one scenario the mitigation is only due to a large density pump out event and if the density is recovered by gas puffing a return to type I ELMs is observed. In another scenario sustained ELM mitigation can be achieved irrespective of the amount of fuelling. Despite a large scan of parameters complete ELM suppression has not been achieved. The results have been compared to modelling performed using either the vacuum approximation or including the plasma response. The requirement for a resonant condition, that is an optimum alignment of the perturbation with the plasma, has been confirmed by performing a scan in the pitch angle of the applied field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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