Study of particle pumping characteristics for different pumping geometries in JT-60U and DIII-D divertors
Study of particle pumping characteristics for different pumping geometries in JT-60U and DIII-D divertors
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JT-60U 和 DIII-D 偏滤器中不同泵送几何形状的颗粒泵送特性研究
DOI：
10.1088/0029-5515/41/12/305
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发表时间：
2001
期刊：
影响因子：
3.3
通讯作者：
Charles F. F. Karney
中科院分区：
文献类型：
--
作者：
H. Takenaga;A. Sakasai;H. Kubo;N. Asakura;M. Schaffer;T. Petrie;M. Mahdavi;D. Baker;S. Allen;G. Porter;T. Rognlien;M. Rensink;D. Stotler;Charles F. F. Karney
比较了JT-60 U W型偏滤器内侧专用通量区（IPP）抽运和两侧专用通量区（BPP）抽运，以及JT-60 U IPP抽运和DIII-D下折流板偏滤器抽运的粒子抽运特性。BPP的泵浦通量比IPP的小约2倍，具有弱的再循环中性通量的输入-输出不对称性; BPP的泵浦通量比IPP的小约3.5-6.5倍，具有强的输入-输出不对称性。BPP的泵送通量的减少与Monte Carlo模拟一致，其中观察到由于进出循环不对称而在外部泵送槽处的回流。在相同的密度范围内，DIII-D在IP = 0.8 MA和BT = 1.6 T时的泵浦通量与JT-60 U IPP在IP = 1.0 MA，BT = 3.8 T和IP = 1.5 MA，BT = 3.5 T时的泵浦通量相当或更小。在DIII-D偏滤器中，从私有通量区抽运，抽运通量随着内-外不对称性的增加而减小。在JT-60 U IPP和DIII-D下偏滤器中，通过偏滤器外等离子体区抽运，由Dα积分辐射归一化的整个等离子体的抽运通量与抽运槽和撞击点之间的距离具有相似的依赖关系。
Particle pumping characteristics were compared between pumping from the inner side private flux region (IPP) and pumping from both sides of the private flux region (BPP) in the JT-60U W shaped divertor, and between JT-60U IPP and pumping in the DIII-D lower baffled divertor. The pumping flux for BPP is smaller than that for IPP by about a factor of 2 with weak in-out asymmetry of recycling neutral flux and by a factor of 3.5-6.5 with strong in-out asymmetry. The reduction of the pumping flux for BPP is consistent with Monte Carlo simulations, where backflow at the outer pumping slot is observed due to in-out recycling asymmetry. The pumping flux in DIII-D at Ip = 0.8 MA and BT = 1.6 T is comparable to or smaller than that for JT-60U IPP at Ip = 1.0 MA, BT = 3.8 T and Ip = 1.5 MA, BT = 3.5 T in the same density regime. In the DIII-D divertor with pumping from the private flux region, the pumping flux decreases with increasing in-out asymmetry. The pumping flux normalized by the integrated Dα emission over the whole plasma exhibits a similar dependence on the distance between the pumping slot and the strike point in JT-60U IPP and the DIII-D lower divertor with pumping through the outer divertor plasma region.