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Browse Prior Art Database

Disc Type Cryotron

IP.com Disclosure Number: IPCOM000098526D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Brennemann, AE: AUTHOR

Abstract

This is a disc type cryotron in which the magnetic field and current density of the gate are related to the geometry.

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Disc Type Cryotron

This is a disc type cryotron in which the magnetic field and current density of the gate are related to the geometry.

The gate conductor consists of alternate circular rings of hard and soft superconductive material. The resistance of the soft superconductive region, superconducting or resistive, is controlled by current flow through the associated control conductor. This geometry eliminates the effect of the thinner edges exhibited by conventional crossed film type cryotrons.

Additional advantages of the disc type cryotron are:
1. The magnetic field and current density in the gate are

computable in closed analytical form.
2. Tapering of the soft superconductive region is employed to

provide a uniform current density.
3. The cryotron is used with a ground plane having the center

hard superconductor connected to it and the remainder

insulated from the ground plane.
4. The control inductance is further reduced below that shown

by providing input and output current leads for the control,

spaced 180 degrees apart, the control current then dividing

and one half flowing through each semicircular control ring.
5. Cryotron gain is controlled by positioning the control

conductor.

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