Flux pumps and superconducting solenoids

摘要: Abstract A review is given of the various types flux pumps and current generators which have been developed so far in several laboratories. Experiments carried out with wire- foil-solenoids, fed by pump Kamerligh Onnes Laboratory, are discussed. It shown that 50 kOe, many-strand wire solenoids a central core diameter order few centimeters, can at present time be this competitive way compared to feeding them ordinary supplies from outside liquid helium dewar. Attention paid unaviodable heat dissipation type pump. The experiments foil-solenoids show disappointingly low carrying capacity Nb-Zr foil comparison wires same material. An explanation results on basis critical-state theory proposed. From pumping characteristics it starting off certain critical field, gradual change selfinduction coil occurs.