Transient Operating Characteristics for the KSTAR TF Superconducting Magnet

The operating characteristics in the poloidal field (PF) and toroidal field (TF) coils system of KSTAR for various operating scenarios for plasma discharging conditions should be studied to check the temperature and stability margin for superconducting cable, cryogenic flow parameters, heat deposition and stress predicament in superconducting magnets to realize the system stably operation. The proposed project includes the development of advanced numerical model, software and detection technology to simulate accurately the thermal conduction, fluid flow heat transfer, electro-magnetic disturbance, mechanical disturbance, electrical circuit equivalent characteristics, eddy current distribution and Eddy losses in support, AC losses in superconducting multi-stage cable, quench detection technology and noise ratio, optimal cryogenically operating parameters such as mass flow rate, inlet pressure and temperature, refrigeration and pump power, detailed dynamics stress and strain distribution in given operating condition, advanced technology such as fiber-optical Bragg (FBG) technology for the on-linear detection for temperature and stress situation in superconducting magnet during normal operating situation. In the paper, we develop the model for transient operating simulation on TF superconducting magnets used in KSTAR during Tokamak normal operation. In order to control the plasma to realize the nuclear fusion, the pulsed current which is in the PF induces the energy deposition in superconducting strands and the nuclear heat from the inner vacuum of Plasma. An adequate thermal-hydraulic performance is crucial for the system, which receives the nuclear heat and AC losses. Main portion of the heat is deposited in the massive structure elements. Effective cooling for the structure and CICC is necessary to intercept the heat.