Abstract
Current lead, connecting dc superconducting device with power supply, is one of the major heat leakage sources. Reducing the heat leakage from the current lead to cryogenic system is very important in the operation of dc superconducting device. The Peltier current lead (PCL) is effective for reducing the heat-leakage. The PCL consisting of the conventional copper lead with a thermoelectric material Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Te <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> inserting into room-temperature end can be effective to reduce heat leakage due to its Peltier effect. For the sake of studying the higher current capacity of PCL, the 1-kA-class PCL was designed and fabricated in this paper. Dynamic stability experiment for the PCL was carried out such that its operating stability was confirmed. The temperature along the PCL was measured and the heat leakage per kA current <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">q</i> was also calculated. The experimental results showed that the PCL can be effective to reduce the heat leakage and has potential applications in the dc superconducting device.
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