Patent ID: 8406833

Claim:
A cryostat and magnet coil system for production of a magnet field B 0 in a measuring volume, the cryostat and magnet coil system comprising: a helium tank for holding liquid helium at a helium temperature T L< 4 K; an LTS solenoid-shaped coil section of a conventional low temperature superconducting (LTS) conductor disposed in said helium tank at said helium temperature T L ; at least one HTS solenoid-shaped coil section of a a high temperature superconducting (HTS) conductor, said HTS section disposed within said helium tank, said LTS and HTS sections being radially nested within another and electrically connected in series; and heating means communicating with said HTS conductor, said heating means disposed, structured and dimensioned to heat the HTS conductor of said HTS section to and to maintain said HTS conductor at an increased temperature T H >T L , wherein 2.2 K<T H <=4.2 K.