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Simulation study of mixed-impurity seeding with extension of integrated divertor code SONIC

机译：混合杂质播种的仿真研究与集成偏移码Sonic

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Aimed at obtaining key physics that determine the controllability of impurity transport in the scrape-off layer (SOL)/divertor regions, the integrated divertor code SONIC has been further extended to handle three or more impurity species kinetically. The extended SONIC code has been applied to the steady-state high-beta scenario-like plasma of JT-60SA as a testbed. We first performed a Ne transport simulation on the fixed Ar-seeded background plasma. Different radiation power distribution along the magnetic field line was obtained between Ar and Ne. The Ar radiation is strong around the top region of the SOL, which is mainly due to the line radiation of highly charged Ar ions trapped by the thermal force. In contrast, the Ne radiation is strong around the high-field side near the X point, mainly due to the line radiation of Ne7+ trapped by the balance between the thermal force and the frictional force with D+ parallel flow. We performed a parametric survey of Ne seeding rate as a second step. The effects of Ne transport on the plasma are self-consistently computed. The Ne impurities are injected into the plasma with a fixed puff rate of Ar. Even a small Ne seeding rate of 0.02 Pa m(3) s(-1) results in lower Ar radiation power in the SOL and core edge than in the Ar-only case. This is mainly due to the high D+ parallel flow velocity towards the inner divertor in the Ar + Ne seeding case. The resultant frictional force transports the Ar impurities towards the inner divertor region. When the line radiation of Ne7+ is switched off in the simulation, such high D+ parallel flow cannot be seen. These results suggest that the line radiation of Ne7+ has a key role for the high D+ parallel flow. The results show the possibility of impurity transport control in the SOL by mixed-impurity seeding.
机译：旨在获得确定杂质输送在刮削层（溶胶）/转位区域中的杂质传输的可控性的关键物理学，已经进一步扩展了集成的偏移码Sonic以动力学地处理三种或更多种杂质物种。扩展的声音码已被应用于JT-60SA的稳态高β场景等离子体作为测试平台。我们首先在固定的ar播种背景等离子体上进行了网元运输模拟。在AR和NE之间获得沿磁场线的不同辐射功率分布。 Ar辐射周围围绕溶胶的顶部区域围绕，主要是由于由热力捕获的高电荷的AR离子的线辐射。相反，NE辐射在X点附近的高场侧围绕高场侧，主要是由于NE7 +的线辐射被捕获的NE7 +被热力与D +并联流动的摩擦力之间的平衡捕获。我们作为第二步进行了对NE播种率的参数调查。网元运输对等离子体的影响是自我一致的计算。将NE杂质注入血浆中，具有固定的AR泡沫速率。甚至0.02Pa m（3）S（-1）的小NE播种速率也导致溶胶和芯边的较低的AR辐射功率而不是在典型的静态中。这主要是由于AR + NE播种盒中的内侧偏转器的高D +平行流速。所得到的摩擦力将Ar杂质朝向内部偏移器区域传送。当在模拟中关闭NE7 +的线辐射时，不能看到这种高D +并行流。这些结果表明NE7 +的线辐射对高D +并行流程具有关键作用。结果表明，通过混合杂质播种，溶液中杂质传输控制的可能性。

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