Engineering design for the HL-2M tokamak components

•The HL-2M is upgraded from HL-2A tokamak which is being constructed in SWIP.•The plasma major radius is 1.78 m, the minor radius is 0.65 m, and the plasma current will reach up to 3 MA with the elongation 1.6–1.8 and tri-angularity more than 0.5.•The new machine has been designed with demountable toroidal field coils and the vacuum vessel is an all-welded torus.•The coils, vacuum vessel and support structure are under fabricated in factories, and the construction of device will be finished in the end of next year.

The HL-2A tokamak will be modified into HL-2M. The Bt at the plasma center (major radius R = 1.78 m) is 2.2 T, the minor radius is 0.65 m. The plasma current IP of HL-2M will reach up to 2.5 MA, the elongation and triangularity is more than 1.8 and more than 0.5, respectively. The vacuum vessel torus consists of 20 sectors with “D” shaped cross-section and double wall structure. 20 toroidal field coil bundles comprise 140 turns which are designed with demountable joints, the poloidal field coils system consists of 25 coils. The engineering design and calculation for field coil system, vacuum vessel, support structure, etc. are finished, many key issues for manufacture process have been discussed with industry and the fabrication of main components of HL-2M tokamak will be carried out in factories.