Development of lab scale conduction cooled HTS magnets Raj Piyush*, Bano Anees, Panchal Arun, Varmora Pankaj, Kanabar Deven, Parghi Bhadresh, Prasad Upendra Institute for Plasma Research, Bhat, Gandhinagar, Gujarat *Email ID: praj@ipr.res.in
Online published on 4 December, 2023. The compact high temperature superconducting (HTS) magnets are promising candidates for high field applications. The development of a HTS magnet includes bending of tapes at a radius greater than the critical bending radius for winding, stacking of double pancakes, inter-turn and ground insulation, optimization of inter-double pancake and terminal joints, mechanical support against expected electromagnetic forces and appropriate cooling mechanism for stable operation at desired magnetic field. HTS magnets of inner bore diameter ~50 mm having two double pancakes and an inter-double pancake joint are manufactured and tested down to 10 K and produced central magnetic field up to 1 T. The double pancakes of these magnet winding packs are manufactured with insulated and non-insulated HTS tapes, using an in-house developed winding machine. Commercial BSCCO (thickness 0.2 mm) and REBCO (thickness 0.14 mm) HTS tapes of width ~4 mm have been used for the winding packs of these magnets. The optimized inter-double pancake (IDP) hybrid joint resistance of ~47 nΩ at 10 K, self-field is achieved for 0.1T magnet. The development of winding pack processes, optimization of IDP joint resistance, testing procedures and test results of HTS magnets are detailed out in this paper. Top Keywords HTS magnets, Joints, Critical current, Magnetic field, Winding. Top |