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Helium exhaust experiments on JET with Type I ELMs in H-mode and with type III ELMs in ITB discharges

机译：在H型I型ELM和ITB放电中III型ELM的JET上进行氦气排放实验

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摘要

An analysis of helium exhaust experiments on JET in the MkII-GB divertor configuration is presented. Helium is pumped by applying an argon frost layer on the divertor cryo pump. Measurement of the helium retention time, tau(He)(*),, is performed in two ways: by the introduction of helium in gas puffs and measurement of the subsequent decay time constant of the helium content, tau(He)(d*); and by helium beam injection and measurement of the helium replacement time, tau(He)(r*). In ELMy H-mode, with plasma configuration optimized for pumping, tau(He)(d*) approximate to 7.2 x tau(E)(th) is achieved, where tau(E)(th) is the thermal energy replacement time. For quasi-steady internal transport barrier (ITB) discharges, the achieved tau(He)(r*) approximate to 4.1 x tau(E)(th) is significantly lower. The achieved helium recycling coefficient, confirmed by an independent measurement to be R-eff approximate to 0.91, is the same in both scenarios. None of the discharges are dominated by core confinement. The difference in tau(He)(*)/tau(E)(th) is instead due to the confinement properties of the edge plasma, which is characterized by Type I ELMs for the H-mode discharges studied, and Type III ELMs for the quasi-steady ITB discharges. This difference is quantified by an independent measurement of the ratio of the helium replacement time with a helium edge source to the energy confinement time.
机译：提出了在MkII-GB偏滤器配置的JET上进行氦气排放实验的分析。通过在分流器低温泵上施加氩霜层来泵送氦气。氦气停留时间tau（He）（*）的测量有两种方法：通过在吹气中引入氦气并测量随后的氦气含量tau（He）（d *）的衰减时间常数。 ）;并通过氦气束注入并测量氦气置换时间tau（He）（r *）。在ELMy H模式下，通过针对泵浦进行了优化的等离子体配置，可获得大约7.2 x tau（E）（th）的tau（He）（d *），其中tau（E）（th）是热能替换时间。对于准稳定的内部运输屏障（ITB）放电，所达到的tau（He）（r *）近似为4.1 x tau（E）（th）。在两种情况下，通过独立测量确认的R-eff约为0.91，可以实现所达到的氦循环系数。没有一种排放是由岩心限制所主导的。相反，tau（He）（*）/ tau（E）（th）的差异是由于边缘等离子体的限制特性引起的，其特征是：对于研究的H型放电，其类型为I ELM，而对于III型放电，则为III ELM。准稳态ITB放电。通过独立测量氦边源氦替代时间与能量限制时间之比来量化此差异。

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