Conduction heat leak of HTc superconducting tapes from 55 K to 4 K

HTS conductors are attractive high current leads for superconducting magnet s due their low heat conductivity. This is of particular importance in low power cooling systems where parasitic heat input has to be kept at a minimu m. We therefore tested the conduction heat leak of commercial BSCCO tapes b etween 55 K and temperatures in the liquid helium range. The measurements w ere performed using a two-stage pulse tube cooler; the tapes mounted betwee n the first and second stage. The results demonstrate that such tapes can b e used advantageously in a superconducting magnet system, in which the magn et is cooled by a low power cryocooler. (C) 1998 Elsevier Science Ltd. All rights reserved.