Schemes for the HL-2A tokamak modification

Three schemes for HL-2A tokamak modification have been proposed to increase plasma parameters and obtain optimal plasma configuration. They are a local modification of adjusting the poloidal coils in vacuum vessel with remaining of vacuum vessel, a middle scale modification of rearranging poloidal coils with remaining of vacuum vessel and an enormous one of redesigning vacuum vessel and poloidal coils. Three schemes have been analyzed and compared, and the third one is optimal. (authors)