Heat Flux Testing of the Vertical Divertor Target under Simulated Separatrix Sweeping Conditions

Abstract

The problem of high heat fluxes on tokamak reactor divertor targets, which hinder the development of durable divertor targets with extended operational lifetimes, is considered. Potential approaches to enhance the allowable heat flux on the high-heat-flux components of the divertor are outlined. In order to verify the operability of one of the approaches, thermal cycling tests of the mockup were performed at the Tsefey-M facility. Thermal analyses carried out prior to the thermal cycling tests, as well as the experimental results themselves, are presented to enable a qualitative comparison. The method under study demonstrated its effectiveness, potentially enabling an increase in the permissible heat flux on the divertor up to 30 MW/m² or more.