Northrop Grumman Systems Corporation

Jefferson Science Associates, LLC

Southeastern Univ. Research Assm

John Rathke

Thomas John Schultheiss

George Neil

Michelle D Shinn

Fay Hannon

Christopher J Horan

Robert Rimmer

Frank Marhauser

Lawrence Dillon-Townes

Gianluigi Ciovati

Jiquan Guo

Edward M Peterson

Elvin Charles Burger

Thomas J Schultheiss

A high-current, compact, conduction cooled superconducting radio-frequency cryomodule for particle accelerators. The cryomodule will accelerate an electron beam of average current up to 1 ampere in continuous wave (CW) mode or at high duty factor. The cryomodule consists of a single-cell superconducting radio-frequency cavity made of high-purity niobium, with an inner coating of NbSn and an outer coating of pure copper. Conduction cooling is achieved by using multiple closed-cycle refrigerators. Power is fed into the cavity by two coaxial couplers. Damping of the high-order modes is achieved by a warm beam-pipe ferrite damper.

High-current conduction cooled superconducting radio-frequency cryomodule

A controlled radius of curvature mirror assembly comprising: a distortable mirror having a reflective surface and a rear surface; and in descending order from the rear surface; a counter-distortion plate; a flow diverter having a flow diverter aperture at the center thereof; a flow return plate having a flow return aperture at the center thereof; a thermal isolation plate having a thermal isolation plate aperture at the center thereof and a flexible heater having a rear surface and a flexible heater aperture at the center thereof; a double walled tube defining a coolant feed chamber and a coolant return chamber; said coolant feed chamber extending to and through the flow diverter aperture and terminating at the counter-distortion plate and the coolant return chamber extending to and through the thermal isolation backplate and terminating at the flow diverter; and a coolant feed and a coolant return exit at the rear of said flexible heater.

Radius of curvature controlled mirror

A process is provided for electromagnetically forming an elongated tubular workpiece by applying an electromagnetic force provided by an energized workcoil to the workpiece radially of its longitudinal axis and by simultaneously applying an axial compressive force to the workpiece. The axial compressive force may be applied to the workpiece from a time before applying the radial electromagnetic force. A forming member including a surface having a desired contour is provided adjacent the workpiece and the workpiece is caused by the electromagnetic force to conformingly engage the surface of the forming member and thereby assume the contoured shape of the forming member. The forming member may be a forming die which surrounds the workpiece or a forming mandrel may be positioned within the workpiece. In another embodiment, both a forming die and a forming mandrel may be employed for performing the forming operation at longitudinally spaced regions of the workpiece. The axial compressive force may be applied to the workpiece at one or both ends by positioning in engagement with an end of the workpiece one surface of a plate member of electrically conductive material, the plate member lying in a plane transverse of the longitudinal axis of the workpiece, and positioning adjacent to but electrically isolated from a second surface of the plate member a flat electrically conductive coil, then energizing the coil to create a force directed against the plate member to thereby compress the workpiece between its ends.

Electromagnetically forming a tubular workpiece

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Centerport, NY, United States of America

John Rathke