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Laminated Gate

IP.com Disclosure Number: IPCOM000096352D
Original Publication Date: 1963-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Ames, I: AUTHOR [+3]

Abstract

The laminated cryotron gate is positioned above a ground plane. The gate has three lamina designated A, B and C. These are separated from each other and from the ground plane by insulating material D. The three lamina which are made of a soft superconducting material are connected at their ends by a hard superconducting material. The laminated gate can be connected into other cryotronic circuitry, not shown, at end points 10 and 11.

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Laminated Gate

The laminated cryotron gate is positioned above a ground plane. The gate has three lamina designated A, B and C. These are separated from each other and from the ground plane by insulating material D. The three lamina which are made of a soft superconducting material are connected at their ends by a hard superconducting material. The laminated gate can be connected into other cryotronic circuitry, not shown, at end points 10 and 11.

With a conventional cryotron gate positioned above a ground plane, the current in the gate flows in a thin uniform layer on the underside of the gate. This layer which carries the current has a thickness substantially equal to the penetration depth of the material. When the current density in this thin layer exceeds the critical current of the material, the gate begins to become resistive. The current carrying capacity of the gate is thus limited by the current carrying capacity of the thin layer on the bottom of the gate.

With the laminated structure shown, when no current is initially flowing in the gate a current is applied between terminals 10 and 11, the current begins to flow only in the bottom lamina C as in a conventional single layer gate. However, after the magnitude of the current is increased to the point where the thin layer on the bottom of lamina C begins to become resistive, any additional amounts of current flow in a thin layer on the bottom of lamina 13. Likewise, when the thin layer on the bottom of l...