Moyses T Kuchnir

US Patent:

46879870, Aug 18, 1987

Filed:

Sep 28, 1984

Appl. No.:

6/655487

Inventors:

Moyses Kuchnir - Elmhurst IL
Frederick E. Mills - Elburn IL

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

G01R 1900

US Classification:

324 713

Abstract:

A current sensor for measuring the DC component of a beam of charged particles employs a superconducting pick-up loop probe, with twisted superconducting leads in combination with a Superconducting Quantum Interference Device (SQUID) detector. The pick-up probe is in the form of a single-turn loop, or a cylindrical toroid, through which the beam is directed and within which a first magnetic flux is excluded by the Meisner effect. The SQUID detector acts as a flux-to-voltage converter in providing a current to the pick-up loop so as to establish a second magnetic flux within the electrode which nulls out the first magnetic flux. A feedback voltage within the SQUID detector represents the beam current of the particles which transit the pick-up loop. Meisner effect currents prevent changes in the magnetic field within the toroidal pick-up loop and produce a current signal independent of the beam's cross-section and its position within the toroid, while the combination of superconducting elements provides current measurement sensitivites in the nano-ampere range.

US Patent:

39791645, Sep 7, 1976

Filed:

Jan 30, 1975

Appl. No.:

5/543331

Inventors:

Moyses Kuchnir - Elmhurst IL

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

F16C 900
F16D 100
F16B 700

US Classification:

403 28

Abstract:

An expansion joint lock for transmitting forces between structural members that contract as they are cooled down to operating temperatures. A piston member mounted to one structural member is slidingly engaged with a chamber in a reception member which is mounted to a second structural member. The remaining space in the chamber is filled with a liquid which freezes at a temperature somewhat above the operating temperature of the structure, allowing forces to be transmitted between the structural members by the frozen liquid.