A new method for measuring plasma energy using superconducting helical coils

We proposed a new method for measuring plasma energy using superconducting helical field coil (HFC) signals. The change in HFC flux is experimentally confirmed due to the increase in plasma energy. The VMEC-DIAGNO equilibrium analysis code clarified the relation between the HFC flux change and the plasma energy increase, and the scaling law for the plasma energy measurement is obtained. The comparison between this proposed method and the conventional diamagnetic coil measurement has been carried out, and the effectiveness of this proposed technique using HFC is confirmed.