Characteristics of divertor heat flux distribution with an island divertor configuration on the J-TEXT tokamak

On J-TEXT, the temporal evolution of heat flux distribution on the high-field side (HFS) divertor plate has been measured by an infrared (IR) camera during the plasma operation with an island divertor configuration. In experiments, the island divertor configuration is an edge magnetic island chain structure surrounded by stochastic layers, which can be induced by resonant magnetic perturbations (RMPs). The experimental results show that the heat flux distribution on the HFS target plate depends significantly on the edge magnetic topology. Furthermore, the impact of Hydrogen fuelling by using supersonic molecular beam injection (SMBI) on the divertor heat flux distributions has also been studied on J-TEXT with an island divertor configuration. It has been observed that the power-detachment can be achieved when the radiation front approached the last closed flux surface (LCFS) after each SMBI pulse. This result may provide a method on access of divertor detachment on a fusion device with a three-dimensional (3D) boundary magnetic structure.