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Parameter dependences of the separatrix density in nitrogen seeded ASDEX Upgrade H-mode discharges

机译:氮素种子升级升级H模式放电中分离缀密度的参数依赖性

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摘要

The upstream separatrix electron density is an important interface parameter for core performance and divertor power exhaust. It has been measured in ASDEX Upgrade H-mode discharges by means of Thomson scattering using a self-consistent estimate of the upstream electron temperature under the assumption of Spitzer-Harm electron conduction. Its dependence on various plasma parameters has been tested for different plasma conditions in H-mode. The leading parameter determining n(e,sep) was found to be the neutral divertor pressure, which can be considered as an engineering parameter since it is determined mainly by the gas puff rate and the pumping speed. The experimentally found parameter dependence of n(e,sep), which is dominated by the divertor neutral pressure, could be approximately reconciled by 2-point modelling.
机译:上游分离器电子密度是用于核心性能和置换器功率排气的重要界面参数。 通过在假设Spitzer-Hable电子传导下的上游电子温度的自一致性估计,在ASDEX升级H模式排放中测量了它。 其对各种等离子体参数的依赖性已经在H模式下进行不同的血浆条件测试。 发现N(e,SEP)的前导参数是中性的转向压力,其可以被认为是工程参数,因为它主要由气体烟率和泵送速度决定。 通过2点建模可以大致协调n(e,sep)的实验发现的N(e,sep)的参数依赖性。

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