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Enhanced helium exhaust during edge-localized mode suppression by resonant magnetic perturbations at DIII-D

机译：DIII-D处的共振磁扰动在边缘局限模式抑制期间增强了氦气的排放

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摘要

Effective helium confinement time, τ_p*,_(He), and its ratio with energy confinement time, τ_p*,_(He)/τ_E, are key metrics quantifying the suitability of fusion plasmas for a continuous burn. Comparisons in the DIII-D tokamak of discharges with suppression of edge localized modes (ELMs) by resonant magnetic field perturbations (RMPs) to the corresponding unperturbed ELMy discharges found that both of these metrics were strongly reduced, by a factor of approximately 2, after application of the RMPs. This reduction in τ_p*, _(He) during RMP ELM suppression was observed in the plasma core, edge, and pumping plenum, where higher neutral helium concentration during RMPs was also measured. These findings provide evidence that future devices employing RMP ELM suppression may meet or even exceed the helium exhaust provided by the ELMs themselves, reducing helium ash, and thus maintaining high fusion gain.
机译：有效氦气限制时间τ_p*，_（He）及其与能量限制时间的比率τ_p*，_（He）/τ_E是量化聚变等离子体连续燃烧适用性的关键指标。 DIII-D托卡马克放电与通过共振磁场扰动（RMP）抑制边缘局部模式（ELM）到相应的无扰动ELMy放电的比较发现，这两个指标在测量后均显着降低了约2倍RMP的应用。在等离子体核心，边缘和抽气室中观察到在RMP ELM抑制期间τ_p*，_（He）的减少，在RMP期间还测量到较高的中性氦浓度。这些发现提供了证据，表明采用RMP ELM抑制技术的未来设备可能会达到甚至超过ELM自身提供的氦气排放量，从而减少了氦灰分，从而保持了较高的熔融增益。

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