The latest progress of the 1st NBI beamline on HL–2M Tokamak

Abstract HL–2M tokamak is under construction in Southwestern Institute of Physics in China, then leading fusion plasma experiment with advanced tokamak configuration will be performed with up to 31 MW auxiliary heating power, including 15 MW NBI power provided by three neutral beam injection (NBI) systems. The 1st NBI beamline for HL–2M tokamak, employing 4 arc-driven ion sources, which can extract 14.4 MW ion beam power, is being developed. The vacuum chamber and main water-cooled components (i.e. ion dumps, calorimeter, deflection magnet, etc.) have been manufactured and assembled. An ion source test bed had been built and testing experiments were carried out and, after testing and optimization, the configuration of ion source was optimized and the experimental maximum extraction parameters for H + reached 75 kV × 35 A.