Superconductor Technologies Inc.

Angela May Ho

Wallace Y Kunimoto

Elna Saito

Michael J Scharen

Arturo Soto

Gregory Ronald Harrah

An improved dewar design that accelerates the manufacturing process of a dewar. In a preferred embodiment, the dewar includes an evacuation port that may be larger in size by a factor of ten over the size of evacuation ports of conventional dewars. The oversized evacuation port, however, does not result in an increase in the overall size or profile of the dewar. The dewar is evacuated and hermetically sealed using an re-usable evacuation tool.

Method of manufacturing dewars

An electrical interconnect provides a path between cryogenic or cryocooled circuitry and ambient temperatures. As a system, a cryocable is combined with a trough-line contact or transition . In the preferred embodiment, the cryocable comprises a conductor disposed adjacent an insulator which is in turn disposed adjacent another conductor . The components are sized so as to balance heat load through the cryocable with the insertion loss. In the most preferred embodiment, a coaxial cryocable has a center conductor surrounded by a dielectric (e.g. Teflon&trade;) surrounded by an outer conductor which has a thickness between about 6 and 20 microns. The heat load is preferably less than one Watt, and most preferably less than one tenth of a Watt, with an insertion loss less than one decibel. In another aspect of the invention, a trough-line contact or transition is provided in which the center conductor is partially enveloped by dielectric to form a relatively flat portion . The preferred overall geometry of the preferred embodiment of the cable is generally cylindrical, although other geometries are possible (e.g., stripline, microstrip, coplanar or slotline geometries). In a further aspect of the present invention, a push-on connector is provided to facilitate connection and disconnection of the cryocable from an HTS circuit and/or a mating feedthrough

Push on connector for cryocable and mating weldable hermetic feedthrough

Evacuation port and closure for dewars

An electrical interconnect provides a path between cryogenic or cryocooled circuitry and ambient temperatures. As a system, a cryocable 10 is combined with a trough-line contact or transition 20. In the preferred embodiment, the cryocable 10 comprises a conductor 11 disposed adjacent an insulator 12 which is in turn disposed adjacent another conductor 13. The components are sized so as to balance heat load through the cryocable 10 with the insertion loss. In the most preferred embodiment, a coaxial cryocable 10 has a center conductor 11 surrounded by a dielectric 12 (e.g. Teflon.TM.) surrounded by an outer conductor 13 which has a thickness between about 6 and 20 microns. The heat load is preferably less than one Watt, and most preferably less than one tenth of a Watt, with an insertion loss less than one decibel. In another aspect of the invention, a trough-line contact or transition 20 is provided in which the center conductor 11 is partially enveloped by dielectric 12 to form a relatively flat portion 28. The preferred overall geometry of the preferred embodiment of the cable is generally cylindrical, although other geometries are possible (e.g., stripline, microstrip, coplanar or slotline geometries). In a further aspect of the present invention, a push-on connector 120 is provided to facilitate connection and disconnection of the cryocable from an HTS circuit and/or a mating feedthrough 124.

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Buellton, CA, United States of America

Angela May Ho