In 1993 and 1994, HL-1 was modified to HL-1M by replacing the vacuum chamber. HL-1M is a circular cross-section Tokamak with R=1.02 m, α=0.26 m. The goal of the HL-1M programme is to conduct high power auxiliary heating (NBI power of~1 MW, ICRH power of~1 MW, ECRH power of 0.5 MW) and current drive (LHCD power of>1 MW) experiments in order to develop the physics and technology basis for the next Tokamak, HL-2A, which is a modifica