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Title: Miniature thermo-electric cooled cryogenic pump

A miniature thermo-electric cooled cryogenic pump for removing residual water molecules from an inlet sample prior to sample analysis in a mass spectroscopy system, such as ion cyclotron resonance (ICR) mass spectroscopy. The cryogenic pump is a battery operated, low power (<1.6 watts) pump with a .DELTA.T=100.degree. C. characteristic. The pump operates under vacuum pressures of 5.times.10.sup.-4 Torr to ultra high vacuum (UHV) conditions in the range of 1.times.10.sup.-7 to 3.times.10.sup.-9 Torr and will typically remove partial pressure, 2.times.10.sup.-7 Torr, residual water vapor. The cryogenic pump basically consists of an inlet flange piece, a copper heat sink with a square internal bore, four two tier Peltier (TEC) chips, a copper low temperature square cross sectional tubulation, an electronic receptacle, and an exit flange piece, with the low temperature tubulation being retained in the heat sink at a bias angle of 5.degree., and with the TECs being positioned in parallel to each other with a positive potential being applied to the top tier thereof.
Inventors:
 [1]
  1. (Valley Springs, CA)
Issue Date:
OSTI Identifier:
871229
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5687575
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
miniature; thermo-electric; cooled; cryogenic; pump; removing; residual; water; molecules; inlet; sample; prior; analysis; mass; spectroscopy; cyclotron; resonance; icr; battery; operated; power; watts; delta; 100; degree; characteristic; operates; vacuum; pressures; times; 10; -4; torr; ultra; uhv; conditions; range; -7; -9; typically; remove; partial; pressure; vapor; basically; consists; flange; piece; copper; heat; sink; square; internal; bore; tier; peltier; tec; chips; temperature; sectional; tubulation; electronic; receptacle; exit; retained; bias; angle; tecs; positioned; parallel; positive; potential; applied; top; basically consists; cryogenic pump; battery operated; internal bore; vacuum pressure; heat sink; water vapor; partial pressure; cyclotron resonance; mass spectroscopy; removing residual; residual water; sample analysis; water molecules; vacuum pressures; sample prior; positive potential; miniature thermo-electric; thermo-electric cooled; cooled cryogenic; /62/165/

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