Abstract
Predictive modeling of the closed Small Angle Slot (SAS) divertor with toroidal tungsten (W) rings in different poloidal locations is conducted to evaluate the impact of divertor closure on high-Z impurity sourcing and transport. These simulations utilize the DIVIMP code for W erosion, transport and deposition/redeposition, with background plasma solutions provided by SOLPS5.1. It is found that the level of W leakage is mostly determined by the divertor plasma conditions, the location of the W source and redeposition processes. High density plasmas in the SAS slot result in shorter ionization mean free paths than in the far-target region, resulting in higher redeposition rate. The induced friction force dominates in the near-target region, driving W impurities downstream towards the target surface. As a result, a W source at the strike point in the SAS divertor demonstrates lower net erosion and divertor leakage, despite higher gross erosion, compared to W sources in the far-target region.
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