First Engineering Validation Results of SST-1 TF Magnets System

• Published in: IEEE transactions on applied superconductivity 2014-06, Vol.24 (3), p.1-6
• Main Authors: Pradhan, S., Doshi, K., Sharma, A., Prasad, U., Khristi, Y., Tanna, V., Khan, Z., Varadharajalu, A., Sharma, D., Vora, M., Singh, A., Parghi, B., Banaudha, M., Dhongde, J., Varmora, P., Patel, D.
• Format: Article
• Language: English
• Subjects: Applied sciences; Design. Technologies. Operation analysis. Testing; Electric connection. Cables. Wiring; Electrical engineering. Electrical power engineering; Electromagnets; Electronics; Exact sciences and technology; Integrated circuits; Joints; Magnet protection; Magnetic field measurement; Magnetic noise; Magnetic shielding; Miscellaneous; Plasmas; quench detection; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; steady-state superconducting Tokamak; Superconducting magnets; toroidal field magnets; Toroidal magnetic fields; two-phase helium cooling; Various equipment and components
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2013.2290380

All SST-1 superconducting Toroidal Field (TF) and Poloidal Field (PF) magnets have been refurbished, integrated, and assembled onto the SST-1 machine shell in mid of 2012. Fabrication of sub nano-ohm, leak tight DC joints in superconducting magnets winding packs, enhancing the insulation strength in operating conditions, and test qualifying all the magnets prior to their integration in SST-1 machine shell were the primary refurbishment aspects. All assembled SST-1 TF magnets in SST-1 machine shell have since been successfully cooled down employing 1.3 kW SST-1 Helium Refrigerator/Liquefier system maintaining helium leak tightness under all temperature conditions. The TF magnets have experimentally demonstrated thermo-mechanical behavior as per the design as well as excellent flow uniformity amongst various parallel paths. Subsequently, these TF magnets have been increasingly charged so as to create a magnetic field of 1.5 T at the SST-1 major radius of 1.1 m. This is the first occasion, when cable-in-conduit wound toroidal field magnets have been successfully operating with two phase flow in a Tokamak application. The first plasma in SST-1 has been successfully obtained in June 2013 where the SST-1 TF magnets have demonstrated excellent functional characteristics. The confidence boosting engineering and functional validation test results of SST-1 TF magnets as well as its performance during the recent SST-1 plasma campaign have been elaborated in this paper.