AI 中文总结
本研究在逃逸电子模拟工具DREAM中实现仿星器等离子体模型，探究仿星器温度崩塌场景下逃逸电子的产生条件，发现仿星器也可能产生大量逃逸电子，且其逃逸电子问题将少于托卡马克。
AI 中文摘要
历史上，相对论性逃逸电子的产生未被认为是仿星器中的潜在问题，但反应堆级仿星器中即便没有外部驱动等离子体电流，这一情况可能也不成立。等离子体电流的大小决定了逃逸电子的指数级产生，即便无外部驱动电流，反应堆相关仿星器中的自举电流也可能相当可观。本文针对仿星器温度崩塌场景下的逃逸电子产生开展先导研究，为可靠研究仿星器中的逃逸电子，在逃逸电子模拟工具DREAM中实现了仿星器等离子体模型，用于探究初始等离子体电流、温度衰减时间尺度与衰减后温度的组合下逃逸电子的产生情况，特别关注仿星器中通过雪崩倍增产生逃逸电子的过程及其与托卡马克的对比。研究发现仿星器中也可能产生大量逃逸电子，并明确了其可能成为隐患的条件，但研究结果支持“反应堆级仿星器中的逃逸电子问题将比托卡马克更少受关注”的观点。
英文摘要
Generation of relativistic runaway electrons has historically not been considered a possible problem in stellarators, but this may not hold in reactor-scale stellarators despite the lack of an externally driven plasma current. The magnitude of the plasma current governs the exponential generation of runaways, and even if there is no externally driven plasma current, the bootstrap current could be considerable in reactor-relevant stellarators. In this paper, we present a pilot study on the generation of runaway electrons in stellarator temperature collapse scenarios. To reliably study runaway electrons in stellarators, we implemented a stellarator plasma model in the runaway electron simulation tool DREAM. The model is used to explore when runaway electrons can be generated with regard to combinations of initial plasma current, temperature decay time scale, and post-decay temperature. Special consideration is given to runaway generation through avalanche multiplication in stellarators, and how it compares to tokamaks. We find that significant runaway electron generation is possible also in stellarators, and demonstrate under which conditions it could be a concern. However, our findings support the conception that runaway electrons will be less of a concern in reactor-scale stellarators compared to tokamaks.
Comments11 pages, 11 figures
