초록 ▼

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 f

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.

대표청구항 ▼

[ What is claimed is:] [23.] Apparatus for housing cryogenic high frequency electronic superconductor apparatus at cryogenic temperatures in an environment isolated from exposure to stray magnetic fields existing external of said housing, comprising:first and second pairs of nested box like magnetic

[ What is claimed is:] [23.] Apparatus for housing cryogenic high frequency electronic superconductor apparatus at cryogenic temperatures in an environment isolated from exposure to stray magnetic fields existing external of said housing, comprising:first and second pairs of nested box like magnetic shielding members comprised of high permeability magnetic material, each of said pairs being comprised of one shielding member oriented in inverted relationship relative to the other shielding member to define an enclosed region, whereby said first pair of shielding members defines a first enclosed region and said second pair of shielding members defines a second enclosed region;said first pair of nested box like magnetic shielding members being housed within said second region in spaced relationship to said second pair of shielding members;first thermally conductive pedestal means located within said second region for spacing said first pair of nested box like magnetic shielding members from said second pair of shielding members and defining a thermally conductive path between said first and second pair of shielding members;second thermally conductive pedestal means located within said first region for supporting said high frequency electronic superconductor apparatus in spaced relation to said first pair of shielding members and defining a thermally conductive path between said high frequency electronic superconductor apparatus and said first pair of magnetic shielding members;electrically shielded electrical transmission line lead means having a thermal conductivity less than the thermal conductivity associated with copper for propagating RF signals;said electrically shielded electrical transmission line lead means extending from outside said second region and along a clearance space defined between said shielding members of said second pair of shielding members, and into said second region, and along another clearance space defined between said shielding members of said first pair of shielding members into said first region, and along side said first thermally conductive pedestal means to said high frequency electronic superconductor apparatus.