关键词: HL-2M 装置；极向场线圈；电磁力；力学性能；塑性变形 

Abstract: Based on the two-dimensional axisymmetric model, the electromagnetic (EM) response of the PF 
coils at the discharge initial time, climbing phase, flat top and current drop phase under various plasma 
configuration is researched. At the same time, the mechanical performance under the extreme conditions is also 
evaluated. The study shows that at the discharge initial time, the vertical EM force of the PF6 coils is the largest 
and reaches 1.9MN. At the end of the discharge top phase, the vertical EM force of the PF5L coil is the largest and 
can be up to 2.6MN in the tripod configuration and 2.06MN in the snowflake and double null configurations. 
Under such extreme conditions, the structural mechanical evaluation of the support shows that it has the local 
plastic deformation. Using ASME VIII.2 as the criterion to evaluate the local high-stress area, the evaluation 
shows that there is no plastic collapse and local failure of the structure. In addition, the axial force of the bolt at 
the inner support near the upper main beam is the largest, and a pre-tightening force must be greater than 50kN. 

Key words: HL-2M tokamak, Poloidal field coil, Electromagnetic force, Structural integrity