JET ILW上局部ICRF热负荷的表征
Characterisation of local ICRF heat loads on the JET ILW
摘要：
当使用离子回旋频率范围（ICRF）加热时，通常在靠近天线的一些面向等离子体的部件上观察到增强的热通量。最近在JET上进行了实验，用新的ITER类壁（ILW）来表征JET ICRF天线的热通量。使用的瓦，热模型的大红色的热成像，热通量进行了评估，从表面温度的增加，在RF阶段的L-模式等离子体。当在每个天线2 MW的功率水平下以-π/2电流驱动带定相操作并且等离子体与外部限制器之间的距离为4cm时，观察到的最大热通量强度为~ 4.5MW/m2。当使用偶极带定相时，热通量减少。沉积在天线限制器或隔膜上的ICRF功率的分数对于偶极定相在2-10%的范围内，对于+/-π/2定相在10-20%的范围内。
英文摘要：
When using Ion Cyclotron Range of Frequency (ICRF) heating, enhanced heat-fluxes are commonly observed on some plasma facing components close to the antennas. Experiments have recently been carried out on JET with the new ITER-Like-Wall (ILW) to characterize the heat flux to the JET ICRF antennas. Using Infra-Red thermography and thermal models of the tiles, heat-fluxes were evaluated from the surface temperature increase during the RF phase of L-mode plasmas. The maximum observed heat-flux intensity was ~ 4.5 MW/m2 when operating with -π/2 current drive strap phasing at power level of 2MW per antenna and with a 4 cm distance between the plasma and the outer limiters. Heat-fluxes are reduced when using dipole strap phasing. The fraction of ICRF power deposited on the antenna limiters or septa was in the range 2-10% for dipole phasing and 10-20% with +/-π/2 phasing.
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