Design parameters of the 500 kVA unit (Fig. 3.6) are highlighted in Table 3.7, where the two values for the winding diameters refer to sandwiched layers that are constructed so as to reduce the effective self-field.
Results of the testing of this unit (Fig. 3.7) are summarized in Table 3.8.
Losses, estimated calorimetrically, amounted to 115 W, taking into account ac losses in the windings and heat leakage from the cryostat and current leads. Future plans for the Fuji/SEC/Kyushu University group's activities include changing the cooling method from pool boiling in liquid nitrogen to continuous flow of supercooled nitrogen with a refrigerator, with the intent of improving the current-carrying capacity of the winding and dielectric breakdown strength.