Superconducting Solenoid (7 T) Indirectly Cooled by Cryocoolers for THz Radiation

The results of testing and performance characteristics of an indirectly cryocooled superconducting solenoid to be used at the tehrahertz (THz) spectroscopy experimental station of the free-electron laser at the Institute of Nuclear Physics are presented. The superconducting solenoid with a winding diameter of 102 mm and a length of 0.5 m is designed for a magnetic field of 6.5 T. A warm diameter of 80 mm is available for THz spectroscopy experiments. A superconducting wire Cu/NbTi = 1.4 is used. The design implements passive protection methods due to sectioning and secondary connected circuits in case of a sudden quench. The required field uniformity of 0.5