Breakdown strength of wrapped paper insulation at 5 K

Assuming a certain stage of development has been attained, it will be possible in the future to use cables with superconductors if they are reliable and economical.1, 2 In addition to the development of superconductors, the cryogenic envelope, and cooling equipment, it is necessary to investigate feasible dielectrics at a few degrees K. This paper is intended to give information regarding the experimental determination of the breakdown strength of paper wrappings impregnated with supercritical helium which could be used in direct voltage cables with superconductors.