Plasma disruptions present a significant challenge to the viability of fusion energy production in tokamak reactors. Among disruption mitigation techniques, shattered pellet injection (SPI) has emerged as a promising approach. The results presented in this paper show novel findings of the impact of nitrogen and neon seeding on the disruption mitigation sequence following SPI on the Joint European Torus (JET). This study exposes an order of magnitude reduction in pre-thermal quench duration for highly seeded plasmas and pure deuterium SPI, a result with significant implications for staggered SPI schemes currently under development. Conversely, no reduction in disruption thermal load mitigation efficacy was observed for single neon and hydrogen mixed SPI across a range of seeding levels, indicating the robustness of this approach. A novel pathway for thermal load mitigation and enhanced runaway electron avoidance with pure deuterium SPI into strongly seeded plasmas is also presented.
この論文では、JETでの破片化ペレット注入(SPI)後の disruption 緩和シーケンスに及ぼす窒素とネオンの注入の影響を示しています。高濃度の不純物注入と純粋な重水素SPIでは、pre-thermal quench 時間が1桁減少することが明らかになりました。一方で、単一のネオンや水素混合SPIでは、注入レベルに関わらず disruption 熱負荷緩和の有効性に変化はありませんでした。これは、段階的なSPIスキームの開発に重要な示唆を与えます。