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Disruption heat loads on the JET MkIIGB divertor

机译：JET MkIIGB分流器上的破裂热负荷

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Combined analysis of divertor thermocouple and IR camera measurements during JET disruptions can provide valuable information on the distribution of the energy loads, even if the stored energy of the JET plasmas is small compared to that foreseen for the next-generation tokamaks. Typically the energy collected at the divertor represents a small fraction of the pre-disruption plasma energy; this is consistent with the high level of radiation observed and with part of the magnetic energy being transferred to the plasma-coupled conductors. The data for this paper are taken from the whole set of disruptive plasmas of JET operation in the years 2000 and 2001. In most of the MkIIGB disruptions, the plasma displaces upwards (away from the divertor); therefore, only a small number of downward events are available for analysis. However, divertor heat loads seem to be more strongly correlated to the delay of the loss of the X-point with respect to the thermal quench than the direction of the plasma displacement. When the plasma thermal energy is lost with the plasma still in X-point configuration, the septum and the tiles wetted by the strike-points, often more than one tile per strike-point, experience a sharp increase in temperature, equivalent to up to 1 MJ m(-2). When the thermal quench occurs at the same time as, or after, the loss of plasma vertical control, no significant divertor tile temperature increase can be observed for both upwards and downwards events. Most of the disruptions purposely made to produce runaway electrons went towards the divertor and, although not systematically, lead to local (mostly at the septum) temperature increase equivalent to a load up to 2 MJ m(-2), often toroidally asymmetric. [References: 19]
机译：在JET中断期间，对偏滤器热电偶和红外热像仪的测量结果进行组合分析，可以提供有关能量负荷分布的有价值的信息，即使与下一代托卡马克所预计的相比，JET等离子体的存储能量很小。通常，在分流器处收集的能量仅代表破裂前等离子体能量的一小部分;这与观察到的高辐射水平以及部分磁能被转移到等离子体耦合导体上是一致的。本文的数据取自2000年和2001年JET运行的整套破坏性等离子体。在大多数MkIIGB破坏中，等离子体向上位移（远离分流器）。因此，只有少量的向下事件可用于分析。但是，偏滤器的热负荷似乎比等离子位移的方向与相对于热猝灭的X点损失的延迟更紧密相关。当等离子仍处于X点配置时失去等离子热能时，隔垫和被触击点弄湿的瓷砖（每个触击点通常多于一个瓷砖）的温度会急剧上升，相当于1 MJ m（-2）。当热淬火与等离子垂直控制损失同时或之后发生时，对于向上和向下事件，均未观察到明显的偏滤器温度升高。故意产生失控电子的大部分干扰都流向了偏滤器，尽管不是系统地，但导致局部（主要是在隔垫处）的温度升高，相当于负荷高达2 MJ m（-2），通常是环形不对称的。 [参考：19]

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