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.

包括漂移在内的SOLPS-ITER边缘代码分析表明，在小角度槽（SAS）中优化偏滤器目标形状可以强烈影响E B漂移粒子通量，从而有可能改善两个环形场方向的偏滤器分离。通过将回收中性粒子从插槽的V型靶（SAS-V）的插槽的公共通量区域（CFR）和专用通量区域（PFR）壁引向分离线，从而实现两个分离增强效果，每个效果分别涉及积极的反馈：（a）由于（并引起）从CFR到PFR的径向E B离子通量大（且引起这种情况），槽的PFR壁处的中性再循环增加；（b）E B减少离子通过PFR从外发散器中流失到内发散器，这是由于外发散器中颗粒保留量的增加导致外靶处电子温度的径向梯度降低所致。这就避免了离子B∇B朝X点运行分流器的一般问题：外部分流器CFR等离子体中的E B粒子流失会使其保持高温并附着。这项工作确定了偏滤器几何形状和漂移之间的强相互作用，这对于优化聚变反应堆功率排放的高级偏滤器可能具有重要的作用。