关键词: NBI 加热束线；离子源；注入器 

Abstract: In order to meet the requirements of high confinement mode and high parameter experiment on 
HL-2M tokamak, 3 neutral beam injectors (NBI) with total heating power at 15MW are planned. The 1st and 2nd 
NBI beamlines employ positive ion sources. It will be determined by the parameters in later operation periods of 
HL-2M tokamak that whether positive or negative ion sources taken by the 3st NBI beamline. In this paper, the 
layout of all NBI beamlines on HL-2M tokamak and the system design idea are given firstly. Then the designed 
parameter and development progress of the 5MW-NBI beam based on 4 sets of 80kV/45A/5s ion sources are 
reviewed. Based on the brief analysis of the physics and engineering feasibility, the conception design, the 
engineering design and the technological research progress of a 2.5MW-NBI beamline, which uses 2 sets of 
200kV/12.5A/10s negative hot cathode ion sources, are introduced. 

Key words: NBI heating beamline, Ion source, Injector