Photon-stimulated desorption yields from stainless steel and copper-plated beam tubes with various pretreatments

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)

DOI:https://doi.org/10.1116/1.576638· OSTI ID:7050418

Foerster, C L; Halama, H; Lanni, C ^[1]

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1. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY (USA)

Photon-stimulated desorption (PSD) from the walls of electron storage rings and associated beamlines imposes serious limits on their beam quality and beam lifetimes. Stainless steel (SS) is the most used material for beam lines and its use has become more dominant for dedicated light sources. Copper-plated SS beam pipes have been selected for the superconducting super collider (SSC) project. Three-meter-long tubes of 3, 8.8, and 10 cm diameter were prepared using the following pretreatments common in storage rings. The samples were chemically cleaned only, vacuum baked to 200 {degree}C, vacuum fired to 950 {degree}C, and argon--oxygen glow-discharge conditioned. A dedicated beam line at the National Synchrotron Light Source was used to measure PSD from the samples. Desorption was measured as a function of beam current during exposure to white light having a critical energy of 500 MeV. Our results are presented and compared with PSD from previous work on aluminum and SS here and at other laboratories. Glow-discharged SS yields the lowest PSD.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7050418
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Vol. 8:3; ISSN JVTAD; ISSN 0734-2101
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430400* -- Particle Accelerators-- Storage Rings
ALLOYS
ALUMINIUM
BEAM CURRENTS
CAVITIES
COPPER
CURRENTS
DESORPTION
ELECTRIC DISCHARGES
ELEMENTS
GLOW DISCHARGES
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
METALS
STAINLESS STEELS
STEELS
STORAGE RINGS
SURFACE TREATMENTS
TRANSITION ELEMENTS