To improve detachment and neutral density/pressure in the long-leg open X-diverter of Huanliu-3 (HL-3), a Closed V-shaped slot X-diverter (CVXD) is proposed, which integrates an X-diverter magnetic configuration with a closed V-shaped slot diverter structure. The physical characteristics of the CVXD are analyzed by SOLPS-ITER, with drifts activated. It was found that the CVXD facilitates diverter detachment at a significantly lower threshold density due to its highly efficient retention of both recycling neutrals and impurities, which enables more efficient pumping as well. In addition, the CVXD effectively mitigates the impact of drifts that pushes particles away from the strike point in the open X-diverter. Furthermore, a detailed scan of the diverter target particle reflection angle suggested that a higher level of the closure enhances those advantageous features of the CVXD. These findings provide valuable insights for the design and optimization of the future diverter upgrade in HL-3, and highlight the significant potential of the CVXD for application in future fusion reactors.
This paper proposes a Closed V-shaped Slot X-divertor (CVXD) to enhance divertor detachment and neutral particle pumping in the HL-3 fusion device. The CVXD integrates an X-divertor magnetic configuration with a closed V-shaped slot structure, which efficiently retains recycling neutrals and impurities, enabling more effective pumping and mitigating the impact of drifts that push particles away from the strike point.