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

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6776356

Johnson, E D; Chou, T S

Based on our experience with the in-situ cleaning of optical systems by reactive r.f. glow discharges and the conditioning and preparation of distributed ion pump (DIP) elements, 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 older type element being common in older storage rings). A new untreated element which was unable to pump below 5x10 /sup /minus/8/ Torr in its initial condition was treated in oxygen and subsequent argon r.f. discharges utilizing the pump element as the discharge electrode producing a nitrogen pumping speed of 168 l/s at 2x10 /sup /minus/8/ Torr. A light bake at 75/degree/C increased this to nearly 500 l/s at 5x10 /sup /minus/8/ Torr. After exposure to atmosphere the speed was reduced to nil at these pressures but subsequently recovered, without bakeout, by glow discharge cleaning. 22 refs., 6 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6776356
• Report Number(s): BNL-41639; CONF-880552-8; ON: DE88016574
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430300* -- Particle Accelerators-- Auxiliaries & Components
ACCELERATORS
CYCLIC ACCELERATORS
DESIGN
EQUIPMENT
LABORATORY EQUIPMENT
NSLS
PRESSURE DEPENDENCE
PUMPING
PUMPS
RADIATION SOURCES
SPUTTER-ION PUMPS
STORAGE RINGS
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
VACUUM PUMPS
VACUUM SYSTEMS