Integrated simulation study of ELM pacing by pellet injection in ITER
Integrated simulation study of ELM pacing by pellet injection in ITER
复制标题
ITER中弹丸喷射ELM起搏的综合模拟研究
DOI：
10.1002/ctpp.201410040
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
T. Takizuka and N. Oyama
中科院分区：
文献类型：
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作者：
N. Hayashi;N. Aiba;T. Takizuka and N. Oyama
使用集成代码TOPICS‐IB进行的模拟表明，小弹丸可以通过深入穿透基座并触发基座顶部附近的高n气球模式来显着减少ELM能量损失，条件是：当基座压力约为自然ELM开始的95%时，从低场侧以足够快的速度注入以接近基座顶部。上述ELM起搏弹丸注入的合适条件的有效性已通过JT-60 U和ITER模拟得到证实。当基座等离子体密度较高时，ELM起搏所需的弹丸粒子含量较大，且在基座顶部附近离理想气球模式的稳定边界较远。对于ITER标准方案，所需的芯块粒子含量约为基座粒子含量的百分之几，这给出了当前设计值的物理背景。模拟还显示，在ELM起搏颗粒之后，可以从高场侧注入燃料颗粒，而不会干扰起搏。（© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA，魏因海姆）
Simulations with an integrated code TOPICS‐IB showed that a small pellet can significantly reduce the ELM energy loss by penetrating deeply into the pedestal and triggering high‐n ballooning modes localized near the pedestal top, with conditions; the injection from the low‐field‐side with a speed fast enough to approach the pedestal top when the pedestal pressure is about 95% of natural ELM onset. The effectiveness of the above suitable conditions of pellet injection for ELM pacing has been confirmed by JT‐60U and then ITER simulations. The pellet particle content required for ELM pacing is larger for the pedestal plasma with higher density and farther from the stability boundary of ideal ballooning mode near the pedestal top. For an ITER standard scenario, the required pellet particle content is about a few % of pedestal particle content, which gives the physics background to the present design value. Simulations also showed that fueling pellets can be injected from the high‐field‐side just after ELM pacing pellets without disturbing the pacing. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)