OBSERVATION OF PERSISTENT CURRENT IN A SUPERCONDUCTING SOLENOID

Modern nuclear magnetic resonance (NMR) techniques were applied to measure a persistent current in a closed super-conducting circuit. The trapped magnetic field was measured and recorded with time. Two measurements extending over a period of 21 and 37 days respectively, were described. An attempt was made to correlate the data with the flux-creep theory. This experiment was performed in the superconducting portion of the critical state diagram. (C.E.S.)