Patent ID: 8255023

Claim:
A cryostat and magnet coil system, the magnet coil system having a plurality of radially nested superconducting solenoid-shaped coil sections which are electrically connected in series for production of a magnet field B 0 in a measuring volume, the cryostat and magnet coil system comprising: a helium tank; liquid helium disposed within said helium tank, said liquid helium having a helium temperature T L ; an LTS section of a conventional low temperature superconductor (LTS) disposed in said helium tank at said helium temperature T L ; a chamber disposed within said helium tank; gaseous helium disposed in said chamber, said gaseous helium having essentially said helium temperature T L ; at least one HTS section disposed within said chamber in contact with said gaseous helium, said HTS section having a high temperature superconductor; and means, disposed in or communicating with said chamber, for keeping helium located in said chamber in a gaseous state.