Development of prototype power supply for ohmic transformer system of SSST

Abstract

The conceptual design of Small Scale Spherical Tokamak (SSST) has been completed at Institute for Plasma Research (IPR). It consists of poloidal field (or Equilibrium) field coils, Toroidal field coils and Ohmic Transformer (OT) system. The poloidal magnets are used for the plasma shaping and equilibrium. The plasma current ramp up and sustenance up to 20 ms is achieved by OT system. The OT system comprises of Central Solenoid (CS) and compensating coils TR1, TR2 & TR3. The Preliminary design for power supply for OT system has been finalized and a prototype OT power supply has been developed at IPR. The conceptual design of prototype Ohmic Transformer Power Supply (OTPS), its philosophy of operation, simulation results and experimental results are presented in this paper.