An innovative divertor concept, the fish tail divertor, for reducing the surface temperature on the divertor target plate in EAST tokamak experiments

Abstract

An innovative divertor concept, the Fish Tail Divertor, is proposed in this paper, aiming at reducing the peak heat load on the tokamak divertor plate as well as that due to the edge localized modes. This new concept has been implemented in experiments to demonstrate its capability of strike point sweeping on the plate at the frequency range from ten to one hundred Hz by using an oscillating magnetic field. The strike point movement of 5-6 cm is achieved by applying a coil current of several percent of plasma current, leading to a significant reduction of heat load on the divertor target plate. The result indicates a possible application in a fusion reactor.

Optimizing control for strike point sweeping using lower divertor coil in EAST

“…The fish tail divertor (FTD) concept [6,7] represents an innovative approach in dynamic magnetic configuration divertors, aimed at enhancing the high heat flux tolerance of divertor targets through strike point sweeping approach, whilst simultaneously sustaining optimal core plasma performance. This strategy utilizes a coil strategically placed in proximity to the strike point but at a distance from the X point, functioning to produce a localized, alternating poloidal magnetic field in the vicinity of the strike point.…”