Compact magnetic shielding enclosure with high frequency feeds for cryogenic high frequency electronic apparatus
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United States of America Patent
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Nov 3, 1998
Grant Date -
N/A
app pub date -
Sep 19, 1996
filing date -
Sep 19, 1996
priority date (Note) -
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Abstract
Operating high frequency cryogenic superconductor devices requires an enclosure that permits application of wide band RF signals from an external source to the superconductor device while maintaining the device at cryogenic temperatures in an essentially magnetic field free environment. A magnetic field shielding enclosure is formed of inner (5, 7) and outer (9, 11) mumetal containers, one larger than the other in size. Each of those containers is formed of two open-ended container like pieces that are nested together with overlapping side walls to define two generally closed regions, the first containing the cryogenic superconductor device (1) and the second (9, 11) containing the first container (5, 7). A shielded high bandwidth transmission line (12), sufficiently compliant physically, is snaked through slight clearance spaces between the pieces of each of those containers to the superconductor device. Suitably the shielded transmission line is formed of materials having a thermal conductivity less than the thermal conductivity of the metal copper.
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