Manipulation of E×B drifts in a slot divertor with advanced shaping to optimize detachment
Manipulation of E×B drifts in a slot divertor with advanced shaping to optimize detachment
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通过先进的成形技术在槽偏滤器中操纵 EäB 漂移，以优化分离
DOI：
10.1088/1741-4326/abb53f
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发表时间：
2020-10
期刊：
影响因子：
--
通讯作者：
Min Xu
中科院分区：
文献类型：
--
作者：
Hailong Du;Houyang Guo;P.C. Stangeby;Xavier Bonnin;Guoyao Zheng;Xuru Duan;Min Xu
包括漂移在内的SOLPS-ITER边缘代码分析表明，小角度狭缝（SAS）中偏滤器靶形状的优化可以强烈影响E× B漂移粒子通量，从而可能改善两个环向场方向的偏滤器分离。这是通过将再循环中性粒子从槽的公共通量区域（CFR）和专用通量区域（PFR）壁朝向分界线引导来实现的，槽中具有V形靶（SAS-V），导致两个单独的增强效应，每个单独地涉及正反馈：（a）由于并导致从CFR到PFR的强径向E× B离子通量，在槽的PFR壁处的中性再循环增加;（B）由于外偏滤器中增加的粒子保留引起的外靶处电子温度的径向梯度的减小，从外偏滤器经由PFR进入内偏滤器的离子损失E× B减小。这就避免了偏滤器运行时离子B ×离子B朝向X点的一般问题：E× B从偏滤器外CFR等离子体中损失的粒子往往会使其保持高温并附着在其上。这项工作确定了偏滤器的几何形状和漂移之间的强烈相互作用，优化先进的偏滤器在聚变反应堆中的功率排气的一个潜在的重要影响。
SOLPS-ITER edge code analysis including drifts shows that optimization of divertor target shaping in a small angle slot (SAS) can strongly influence E× B drift particle fluxes, potentially improving divertor detachment for both toroidal field directions. This is enabled by directing recycling neutrals toward the separatrix from both the common flux region (CFR) and the private flux region (PFR) walls of the slot with a V-shape target in the slot (SAS-V), leading to two separate reinforcing effects, each individually involving positive feed-back: (a) increase of neutral recycling at the PFR wall of the slot due to—and causing—strong radial E× B ion flux from the CFR to the PFR; (b) decrease of E× B loss of ions out of the outer divertor into the inner divertor via the PFR due to reduction of the radial gradient of electron temperature at the outer target caused by the increased particle retention in the outer divertor. This circumvents the general problem for divertor operation with ion B ×∇B toward the X-point: E× B loss of particles from the outer divertor CFR plasma tends to keep it hot and attached. This work identifies a strong interaction between divertor geometry and drifts, a potentially important effect for optimizing advanced divertors for power exhaust in fusion reactors.
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影响因子：
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作者：
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