Disruption heat loads on the JET MkIIGB divertor
Disruption heat loads on the JET MkIIGB divertor
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DOI：
10.1088/0741-3335/44/6/319
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发表时间：
2002-06
影响因子：
2.2
通讯作者：
V. Riccardo;P. Andrew;L. Ingesson;G. Maddaluno
中科院分区：
文献类型：
--
作者：
V. Riccardo;P. Andrew;L. Ingesson;G. Maddaluno
偏滤器热电偶和红外相机测量在JET中断的组合分析可以提供有价值的信息的能量负载的分布，即使存储的能量的JET等离子体是小相比，预见到的下一代托卡马克。通常，在偏滤器收集的能量代表分裂前等离子体能量的一小部分;这与观察到的高水平辐射以及部分磁能被转移到等离子体耦合导体是一致的。本文的数据取自2000年和2001年JET运行的一整套分裂等离子体。在大多数的MkIIGB中断，等离子体向上位移（远离偏滤器），因此，只有少数向下的事件可用于分析。然而，偏滤器的热负荷似乎更强烈地相关的延迟损失的X-点相对于热淬火比等离子体位移的方向。当等离子体热能在等离子体仍处于X点配置的情况下损失时，隔膜和由撞击点润湿的瓦片（通常每个撞击点多于一个瓦片）经历温度的急剧增加，相当于高达1 MJ m-2。当热猝灭发生在等离子体垂直控制丧失的同时或之后时，对于向上和向下的事件，都不能观察到偏滤器瓦片温度的显著增加。大部分的破坏故意产生逃逸电子去偏滤器，虽然不是系统性的，导致局部（主要是在隔膜）的温度增加相当于负载高达2兆焦耳m-2，往往环不对称。
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 \nobreak 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.