含氮杂质的WEST等离子体芯部钨峰化的回旋动理学预测
Gyrokinetic prediction of core tungsten peaking in a WEST plasma with nitrogen impurities
AI总结：
本文通过全f回旋动理学模拟预测WEST等离子体芯部钨峰化，发现氮杂质虽降低新经典峰化但会削弱湍流屏蔽而增强总体钨峰化，为ITER电流爬升阶段杂质注入与ECRH加热策略提供依据。
摘要：
利用全f回旋动理学模拟，预测了WEST等离子体芯部出现钨峰化，模拟同时包含了碰撞输运和湍流输运。该预测通过辐射热测量的合成诊断得到了验证。尽管氮杂质被证明会降低轴上钨的新经典峰化，但当氮杂质存在时，总体钨峰化反而增强，因为氮杂质削弱了离轴区域的湍流屏蔽作用。这一发现对ITER的等离子体电流爬升阶段具有重要意义，在该阶段期望通过注入轻杂质来降低面向等离子体部件处的温度并减少钨溅射。该结果为进一步在早期施加ECRH加热以维持芯部功率平衡裕度提供了论据。新经典峰化因子在XGC与FACIT之间进行了交叉验证。XGC模拟了分界面处的热通量和热负荷宽度，并与WEST实验数据进行了对比。
英文摘要：
Tungsten peaking is predicted in the core of a WEST plasma with total-f gyrokinetic simulations, including both collisional and turbulent transport. This prediction is validated with a synthetic diagnostic of the bolometry. Although nitrogen impurities are shown to reduce the neoclassical peaking of tungsten on-axis, the overall tungsten peaking increases when nitrogen impurities are present, as they reduce the turbulence screening off-axis. This finding is important for the plasma current ramp-up phase of ITER, where light impurities seeding will be desirable to achieve low temperatures at the plasma-facing components and reduce tungsten sputtering. It provides further argument for applying early ECRH heating to maintain margins on the core power balance. The neoclassical peaking factor is cross-verified between XGC and FACIT. The heat flux at separatrix and the heat load width are modeled by XGC and compared to WEST data.
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