Experimental simulation of the Super-X divertor for detached plasma using TPD-Sheet IV

We confirm the neutral-particle backflow characteristics of detached plasma with a Super-X divertor-like target using a linear divertor simulator TPD-Sheet IV. The effect of a divergent magnetic field upon the generation of the detached plasma is found to be weak. Under a divergent magnetic field, the heat load on the target plate with a Super-X divertor-like target is suggested to be reduced by 3-5 times compared with a case in which a conventional diverter (CD) is used. In addition, it is suggested that there is an optimal magnetic-field divergence that prevents backflow of neutral particles.