1. During ohmic and L-mode discharges, detachment and, in particular, the density limit is achieved at lower main plasma density in the closed JET Mark. IIA/P divertor compared with Mark I. However, complete divertor detachment has not been observed with the Mark IIA/P divertor. 2. Effects of divertor configuration are stronger in Mk. IIA/P than for Mk. I with the detachment beginning in off-separatrix regions for horizontal plate configurations. The corner region appears to be associated with enhanced recycling and/or volume recombination. 3. Numerical modelling (EDGE2D/NIMBUS) of detachment for vertical plate L-mode discharges is in agreement with experiment. However, the approach to the density limit and MARFE formation is not well reproduced and may depend sensitively on the (increased) impurity levels in the Mk. IIA divertor. 4. In H-mode discharges detachment can be obtained on the inner divertor between ELMs. Detachment is a consequence of the intrinsic edge density for a given configuration and the confinement may degrade with or without the onset of divertor detachment.
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机译：在欧姆和L模式排出期间，脱离和封闭射流中的较低主等离子体密度实现密度极限。与Mark I相比，IIA / P VEREDOR与MARK IIA / P VERERTOR尚未观察到完整的偏移器脱离。 2.偏移器配置的影响在MK中更强大。 IIA / P比MK。我用脱离从分离的水平板配置开始。拐角区域似乎与增强的回收和/或体积重组相关联。 3.垂直板L模式放电拆卸的数值建模（EDGE2D / NIMBUS）与实验一致。然而，密度限制和马乳形成的方法并不良好再现，并且可以敏感地依赖于MK中的（增加）杂质水平。 iia devertor。在H模式下，可以在ELM之间的内侧偏移器上获得脱离。脱离是给定配置的内在边缘密度的结果，并且限制可能与倾斜器分离的开始或没有发作。
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