Stewart S Shen

US Patent:

6844561, Jan 18, 2005

Filed:

Oct 31, 2002

Appl. No.:

10/284175

Inventors:

Brian Rusnak - Livermore CA, US
James M. Hall - Livermore CA, US
Stewart Shen - Danville CA, US
Richard L. Wood - Santa Fe NM, US

Assignee:

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

International Classification:

G21K 104

US Classification:

2505051, 250251

Abstract:

A rotating aperture system includes a low-pressure vacuum pumping stage with apertures for passage of a deuterium beam. A stator assembly includes holes for passage of the beam. The rotor assembly includes a shaft connected to a deuterium gas cell or a crossflow venturi that has a single aperture on each side that together align with holes every rotation. The rotating apertures are synchronized with the firing of the deuterium beam such that the beam fires through a clear aperture and passes into the Xe gas beam stop. Portions of the rotor are lapped into the stator to improve the sealing surfaces, to prevent rapid escape of the deuterium gas from the gas cell.

US Patent:

47273160, Feb 23, 1988

Filed:

Apr 16, 1985

Appl. No.:

6/723674

Inventors:

Stewart S. Shen - Oak Ridge TN
C. Thomas Wilson - Norris TN

Assignee:

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

International Classification:

G01R 120
H01F 2728

US Classification:

324127

Abstract:

A transformer current sensor having primary turns carrying a primary current for a superconducting coil and secondary turns only partially arranged within the primary turns. The secondary turns include an active winding disposed within the primary turns and a dummy winding which is not disposed in the primary turns and so does not experience a magnetic field due to a flow of current in the primary turns. The active and dummy windings are wound in opposite directions or connected in series-bucking relationship, and are exposed to the same ambient magnetic field. Voltages which might otherwise develop in the active and dummy windings due to ambient magnetic fields thus cancel out. The resultant voltage is purely indicative of the rate of change of current flowing in the primary turns.