论文标题
两阶段破碎的颗粒注入对Tokamak的破坏的影响
Effect of Two-Stage Shattered Pellet Injection on Tokamak Disruptions
论文作者
论文摘要
Tokamak反应堆中有效的缓解系统应限制墙壁暴露于局部热量损失和高电流失控的电子束的影响，并避免在结构上过多的力。我们在这些方面使用具有梦想框架的模拟[M. Hoppe等（2021）Comp。物理。社区。 268，108098]。为了最大程度地减少所获得的失控电流，发现了最佳的注射氘量。该范围对等离子体对Lyman辐射的不透明度敏感，该等离子会影响氘的电离度，从而影响雪崩的失控。两阶段的注射方案，在由霓虹灯引起的辐射热淬灭之前，仅由仅氘会产生稀释冷却，减少了热尾种子和壁上的局部运输热负荷。但是，在核操作过程中，来自活化壁和tri的额外的失控种子来源使得难以达到可耐受的低失控电流。
An effective disruption mitigation system in a tokamak reactor should limit the exposure of the wall to localized heat losses and to the impact of high current runaway electron beams, and avoid excessive forces on the structure. We evaluate with respect to these aspects a two-stage deuterium-neon shattered pellet injection in an ITER-like plasma, using simulations with the DREAM framework [M. Hoppe et al (2021) Comp. Phys. Commun. 268, 108098]. To minimize the obtained runaway currents an optimal range of injected deuterium quantities is found. This range is sensitive to the opacity of the plasma to Lyman radiation, which affects the ionization degree of deuterium, and thus avalanche runaway generation. The two-stage injection scheme, where dilution cooling is produced by deuterium before a radiative thermal quench caused by neon, reduces both the hot-tail seed and the localized transported heat load on the wall. However, during nuclear operation, additional runaway seed sources from the activated wall and tritium make it difficult to reach tolerably low runaway currents.
