Normal Zone Initiation and Propagation Characteristics of a Solid Nitrogen Cooled GdBCO Racetrack Pancake Coil

Effects of turn-to-turn compactness in the straight sections of HTS racetrack coils on thermal and electrical characteristics

“…Unfortunately, the turnto-turn compactness of straight sections in these coils is relatively attenuated compared to those of round sections, because of the anisotropic pressure toward the bobbin surface during winding. This may cause mechanical problems, such as wire deformation by the large electromagnetic force as well as by the torque [8][9][10][11][12].…”

Towards liquid-helium-free, persistent-mode MgB2MRI magnets: FBML experience

“…Also as with the SN2 plot in figure 2, the cold chamber temperature remained at 35.6 K for a period of time, here, ∼0.5 day, owing to the latent heat (8.3 J cm −3 ) of the SN2 phase. This SN2 thermal mass enhancer design concept for the LHe-free magnets has been studied by others [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. It should be noted here that GE was the first manufacturer in the early 1990s to market LHe-free superconducting MRI magnets when it introduced all-Nb 3 Sn, cryocooled MRI magnets operating at 10 K, the practical upper temperature for Nb 3 Sn [20].…”