FLNP Seminar

04-03-2025 15:00 Conference hall (bldg. 42, 3rd floor)

"HTS solenoid for 5T with an aperture of 50 mm with increased stability for liquid free cooling"

Dorofeev G.L., Drobin V.M., Lebedev V.A. (VBLHEP, JINR, Dubna)

A solenoid with a winding with an internal diameter of 50 mm and a length of 100 mm made of G2 HTS tape with a width of 4 mm without insulation was manufactured and tested in helium vapor over a wide temperature range and in liquid nitrogen. The magnetic field in the center of the solenoid reaches 5.6 T at a temperature of about 15 K at a current of 200 A, which is close to the current of a short tape sample under these conditions. Direct current energy losses at a field of 5 T in stationary conditions do not exceed 1 mW per 1 cm of the length of the solenoid winding. The absence of electrical insulation between the layers of HTS tape provides increased resistance of the solenoid to transition to a non-superconducting state. In addition, a technology has been developed for manufacturing windings from HTS tape without insulation between the layers. A pilot set of technological equipment for the manufacture of HTS solenoid windings has been developed, assembled and put into operation.
The advanced technology allows for scaling: the manufacture of solenoids of any length and aperture. In particular, the thickness of the solenoid winding for 20 T manufactured using the developed technology may be less than 40 mm.