Electricity: conductors and insulators – With fluids or vacuum – With cooling or fluid feeding – circulating or distributing
Patent
1984-07-17
1986-07-15
Grimley, Arthur T.
Electricity: conductors and insulators
With fluids or vacuum
With cooling or fluid feeding, circulating or distributing
62514R, F17C 300, H01B 734
Patent
active
046008020
ABSTRACT:
A cryostat current lead design uses a relatively high (i.e., at room temperature) thermal and electrical conductiveity first tube at its top to minimize joule heating. A relatively low thermal and electrical conductivity second tube is disposed below the first tube and thermally insulates the current lead to lesson the zero current loss. A superconductivity lead accomodating lower member is attached at the bottom of the second tube with strands of wire extending from the interior of the first tube to the interior of the lower member which preferably is a tube. Superconducting leads may be attached by lead-tin alloy (soft) solder at the outside of the lower member. The method of the present invention is the use of the current lead to provide electrical power to a device within the liquid helium bath of the cryostat. Preferably, the room temperature resistance of the lead is between 0.7 volts and 1.0 volts divided by the maximum current to be carried.
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Berg Robert F.
Ihas Gary G.
Clarke Dennis P.
Grimley Arthur T.
Nimmo Morris H.
University of Florida
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