Heat leak estimation of gas-cooled Peltier current leads
〇イワノフ ユーリ，渡邉 裕文，筑本 知子，山口 作太郎（中部大）
Abstract:The amount of heat that enters the cryogenic zone from the environment determines the economic efficiency of the superconducting devices. Heat flows through the thermal insulation, as well as through the so-called "thermal bridges" (supports, suspensions, pipelines, and current leads). The balance between the heat leak through the current lead and the Joule heat generation inside current lead determines the optimal form factor providing a minimum heat leak of about 50 W/kA at operating current. In our approach, Peltier element, which is sequentially built into the current lead, creates counteraction to the natural flow of heat reducing the heat leak by about 30%. A further decrease in heat leak can be achieved by cooling the current lead with an evaporating coolant. The experimental study of gas-cooled HTS current lead combined with the Peltier element was carried out for the first time. An additional 30% reduction in heat leak was confirmed.