High temperature superconducting current lead assembly for cryogenic apparatus

A lead assembly of a cryogenic system, the cryogenic system including a vessel containing a cryogenic apparatus, the lead assembly comprising:

• a heat exchanger composed of an electrically-conductive and thermally-conductive material and having a first end configured to electrically connect to a power supply and a second end opposite the first end, the heat exchanger further comprising a partition extending axially from the first end to the second end and laterally across a center of the heat exchanger, the heat exchanger including a plurality of fins extending from the partition to a respective free end, the plurality of fins forming a plurality of channels extending through the heat exchanger from the first end to the second end, each of the plurality of channels extending from the respective free ends to the partition, the plurality of fins forming a plurality of thermal surfaces within the heat exchanger, the heat exchanger having a transverse cross section;
• and
• a high temperature superconductor (HTS) assembly coupled to the heat exchanger at the second end of the heat exchanger and configured to couple to the cryogenic apparatus, the HTS assembly comprising an HTS strip,
• wherein the lead assembly is configured to provide electric current to the cryogenic apparatus and further configured to be embedded with the vessel, wherein dimensions and structure of the heat exchanger are sized such that in use a temperature at the second end of the heat exchanger is at or below a critical superconducting temperature of the HTS strip during ramping of the cryogenic apparatus.