Comparison of the synchrotron radiation induced gas desorption in aluminum vacuum chambers after chemical and argon glow discharge cleaning
Journal Article
·
· J. Vac. Sci. Technol., A; (United States)
In a dedicated synchrotron radiation beam line at the DCI storage ring at Orsay, France a series of measurements were made to evaluate the effect of argon glow discharge cleaning either as a pretreatment in the laboratory, or in situ, following the installation and pumpdown of the vacuum system in the LEP (Large Electron Positron storage ring) machine. On exposure to synchrotron radiation the gases desorbed were H/sub 2/, CH/sub 4/, CO, and CO/sub 2/ with Ar in the glow discharge cleaned chambers. With continued exposure the gas desorption decreased with time except that the Ar showed a definite reluctance to clean up. When applied to LEP conditions, chemical cleaning only gave the required beam-gas lifetime after the shortest exposure. The worst overall situation results from the in situ Ar discharge cleaning due to the low pumping speed for Ar in the LEP machine.
- Research Organization:
- CERN, LEP Division, 1211 Geneva 23, Switzerland
- OSTI ID:
- 6554641
- Journal Information:
- J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 5:4; ISSN JVTAD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
43 PARTICLE ACCELERATORS
430303 -- Particle Accelerators-- Experimental Facilities & Equipment
430400* -- Particle Accelerators-- Storage Rings
ALKANES
ALUMINIUM
ARGON
BREMSSTRAHLUNG
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CLEANING
DCI ORSAY STORAGE RING
DEGASSING
DESORPTION
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
GASES
HYDROCARBONS
HYDROGEN
LEP STORAGE RINGS
METALS
METHANE
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PUMPING
RADIATIONS
RARE GASES
SORPTIVE PROPERTIES
STORAGE RINGS
SURFACE CLEANING
SURFACE FINISHING
SURFACE PROPERTIES
SYNCHROTRON RADIATION
VACUUM SYSTEMS
430303 -- Particle Accelerators-- Experimental Facilities & Equipment
430400* -- Particle Accelerators-- Storage Rings
ALKANES
ALUMINIUM
ARGON
BREMSSTRAHLUNG
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CLEANING
DCI ORSAY STORAGE RING
DEGASSING
DESORPTION
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
GASES
HYDROCARBONS
HYDROGEN
LEP STORAGE RINGS
METALS
METHANE
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PUMPING
RADIATIONS
RARE GASES
SORPTIVE PROPERTIES
STORAGE RINGS
SURFACE CLEANING
SURFACE FINISHING
SURFACE PROPERTIES
SYNCHROTRON RADIATION
VACUUM SYSTEMS