Steam ejector-condenser: stage I of a differential vacuum pumping station

Journal Article · Wed Apr 01 00:00:00 EST 1981 · J. Vac. Sci. Technol.; (United States)

DOI:https://doi.org/10.1116/1.570862· OSTI ID:6361178

Hanson, C L; Alger, T W

A steam ejector-condenser unit was built and tested to produce a 10 Torr (13.3 x 10/sup 2/Pa) vacuum with a 2 cm aperture to the atmosphere. This unit is the first stage of a differential vacuum pumping station that will be used with the Experimental Test Accelerator. The accelerator's electron beam will pass through a series of openings from a high vacuum (5 x 10/sup -6/ Torr) to the atmosphere. The differential system consists of four vacuum pumping units separated by 2 cm-diam apertures. Superheated steam is injected near the final beamline orifice to reduce the quantity of atmospheric air flowing into the steam ejector--condenser unit. The steam ejector in the condenser vessel is open at its center to permit passage of the accelerator beam. Five nozzles mounted in a conical array produce the ejector vacuum of 10 Torr. The ejector exhausts into the condenser and forms a barrier to air flow into the lower pressure region. This feature permits high volume cold trapping and cryopumping of water vapor in the remaining lower-pressure stages. Tests have proven that the steam ejector--condenser is a reliable operating unit and suitable for long-term, steady-state accelerator operation.

• Research Organization: Lawrence Livermore National Laboratory, University of California, Livermore, California 94550
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6361178
• Journal Information: J. Vac. Sci. Technol.; (United States), Vol. 18:3
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ACCELERATORS
VACUUM SYSTEMS
LOW PRESSURE
COLD TRAPS
CRYOPUMPS
ELECTRON BEAMS
STEAM
STEAM CONDENSERS
SUPERHEATING
VACUUM PUMPS
WATER VAPOR
BEAMS
CONDENSERS
EQUIPMENT
FLUIDS
GASES
HEATING
LABORATORY EQUIPMENT
LEPTON BEAMS
PARTICLE BEAMS
PUMPS
TRAPS
VAPOR CONDENSERS
VAPORS
420700* - Engineering- Vacuum Engineering- (-1987)