Test of Peltier Current Lead for Cryogen-Free Superconducting Magnet

Peltier current leads (PCL) were applied to a cryogen-free superconducting magnet (CFM) of 5 T/90 A. We measured the temperature profiles on the current lead of the CFM. Compared with the conventional copper current lead, the PCL reduced the temperature and the temperature gradient on the first stage of the cryocooler of the CFM at zero current. The current operation of the CFM improved the reductions due to the heat pump of the Peltier element. These results are the direct proof of the heat leakage reduction by the PCL