In-situ reactive glow discharge cleaning of NSLS distributed ion pumps

Conference · Fri Sep 30 04:00:00 EDT 1988 · AIP Conf. Proc.; (United States)

OSTI ID:6775981

Johnson, E D; Chou, T S

Based on our experience with the in-situ cleaning of optical systems by reactive r. f. glow discharges (1,2) and the conditioning and preparation of distributed ion pump (DIP) elements (3), we have sought to develop strategies for recovering from severe vacuum accidents by restoring DIP elements of storage rings such as those at the NSLS in-situ. In this paper we will describe a series of experiments conducted in a test apparatus to condition a so called 'egg-crate' DIP in-situ, (this type element is common in older storage rings). A new untreated element, which was unable to pump below 5 x 10/sup -8/ Torr in its initial condition, was treated in oxygen and subsequent argon r.f. discharges, utilizing the pump element as the discharge electrode, resulting in a nitrogen pumping speed of 168 l/s at 2 x 10/sup -8/ Torr. A light bake at 75/sup 0/C increased this to nearly 500 l/s at 5 x 10/sup -8/ Torr. After exposure to atmosphere the speed was reduced to nil at these pressures but subsequently recovered, without bakeout, by glow discharge cleaning.

• Research Organization: Brookhaven National Laboratory, NSLS, Upton New York 11973
• OSTI ID: 6775981
• Report Number(s): CONF-880552-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 171:1
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430400* -- Particle Accelerators-- Storage Rings
ACCELERATORS
CAVITY RESONATORS
CLEANING
CONTAMINATION
CYCLIC ACCELERATORS
DATA
ELECTRIC DISCHARGES
ELECTRONIC EQUIPMENT
EQUIPMENT
EXPERIMENTAL DATA
GLOW DISCHARGES
INFORMATION
LABORATORY EQUIPMENT
NSLS
NUMERICAL DATA
OPTICAL SYSTEMS
PUMPS
RADIATION SOURCES
RESONATORS
SPUTTER-ION PUMPS
STORAGE RINGS
SURFACE CLEANING
SURFACE FINISHING
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
ULTRAHIGH VACUUM
VACUUM PUMPS
VACUUM SYSTEMS