Recent TCV experiments confirm the predicted formation of an electric potential well, below the magnetic X-point, in configurations with unfavorable $B_t$ field direction (ion $\nabla B$ drift away from the divertor), that substantially reshapes the typical divertor $E\times B$ flow pattern. The local charge balance $\nabla \cdot \mathbf{j}$ in the private flux region (PFR) of diverted tokamak plasmas has been previously argued to be dominated by parallel and diamagnetic currents. This hypothesis is tested herein in TCV discharges by comparison with SOLPS-ITER simulations, fully accounting for drifts and currents. Simulated parallel currents correctly capture measured current profile characteristics for both targets and both $B_t$-directions, whereas those omitting drifts fail. It is shown that the resulting parallel currents dictate the electric fields in the PFR for low temperature (detached divertor) conditions resulting in locally negative electric plasma potential in configurations with unfavorable H-mode access.

最近的TCV实验证实，在不利的构型下，预计会形成低于磁X点的势阱 ${乙}_{Ť}$ 场方向（离子 $\nabla 乙$ 偏离分流器），从而显着改变了典型分流器的形状 $Ë\times 乙$流模式。当地费用余额$\nabla \cdot \mathbf{Ĵ}$以前已经论证了转向的托卡马克等离子体的专用磁通量区域（PFR）中的电流是由平行和反磁电流控制的。通过与SOLPS-ITER仿真进行比较，在TCV放电中测试了该假设，充分考虑了漂移和电流。模拟的并联电流正确地捕获了两个目标以及两个目标的测量电流曲线特征${乙}_{Ť}$方向，而那些忽略漂移的方法将失败。结果表明，所产生的并联电流决定了低温（分离的分流器）条件下PFR中的电场，导致在不利于H模式访问的配置中产生局部负电浆电势。