Brooks Automation Gmbh

Helix Technology Corporation

Edwards Vacuum LLC

Doreen J Ball-DiFazio

Robert P Sullivan

Allen J Bartlett

Joseph Chopy, Jr

Maureen C Buonpane

John J Varone

Paul E Amundsen

Oliver J Dumas

Ronald N Morris

Leonard A Loranger

Stephen R Matte

Ronald Norman Morris

Ernest D Quintanilha

A refrigerant management system controls the supply of refrigerant from two or more variable speed and fixed speed compressors to a plurality of cryogenic refrigerators. The system employs a plurality of sensors to monitor and regulate the overall refrigerant supply to deliver an appropriate refrigerant supply to each of the cryogenic refrigerators. The amount of refrigerant to supply is based on an aggregate demand for refrigerant from the plurality of cryogenic refrigerators and a refrigerant correction metric. An appropriate supply of refrigerant is distributed to each cryogenic refrigerator by adjusting the speed of the variable speed compressors or, alternatively, selectively turning the compressors on or off. The speed of the variable speed compressors is adjusted by determining an amount of refrigerant to supply to the plurality of cryogenic refrigerators. If the aggregate demand for refrigerant exceeds the capacity of the compressors, then the speed of a refrigerator within the plurality of refrigerators is adjusted.

Helium management control system

A cryogenic refrigerator includes a regenerative heat exchanger material in thermal contact with a working gas including a tin-antimony (Sn&#x2014;Sb) alloy or a tin-gallium (Sn&#x2014;Ga) alloy in at least one cooling stage. The regenerative heat exchanger material can include an Sn&#x2014;Sb-M alloy, with M including at least one element selected from the group consisting of Bi, Ag, Ge, Cu, La, Mg, Mn, Nd, Ni, Pd, Pt, K, Rh, Sm, Se, S, Y, Fe, In, Al, Ce, Dy, Cd, Ti, Au, P, Pr, Yb and Zn. The cryogenic refrigerator can include a Gifford-McMahon refrigerator, a pulse tube refrigerator, or a Stirling refrigerator. A cryopump includes cryopanels adapted to condense or adsorb gases and a cryogenic refrigerator.

Cryogenic pump employing tin&#x2014;gallium alloys and methods of use

A cryopanel is formed of aluminum to avoid copper ions in a work chamber, and the aluminum is coated with a Teflon.RTM. polymer for corrosion resistance. A corrosion resistant thermally conductive link is obtained by surrounding indium with a polymer coated C-ring. The cryopanel is shaped as a trough to enable draining of liquid during regeneration.

Corrosion resistant cryopump

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Hopkinton, MA, United States of America

Doreen J Ball-DiFazio