Preliminary study of the X-points control algorithm for advanced divertor configuration on HL-2M

In order to study the advanced divertor physics and support the high performance plasma operation, a new control algorithm has been developed for the advanced divertor configuration (snowflake and tripod) on HL-2M. The response of the PF currents due to the change of the X-points positions has been established in this algorithm. The two X-points of the snowflake or tripod configuration can be independently controlled both at the radial and the vertical direction by this control algorithm. With this control algorithm, the preliminary simulation results have been achieved. Furthermore, with this algorithm the exact snowflake configuration can be obtained from the tripod configuration by control the X-points positions.