Measurements of photon stimulated desorption from thick and thin oxide of KEKB collider copper beam chambers and a stainless steel beam chamber
| Autor: | K. Kanazawa, C. L. Foerster, C. Lanni |
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| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 19:1652-1656 |
| ISSN: | 1520-8559 0734-2101 |
| DOI: | 10.1116/1.1340661 |
| Popis: | Photon stimulated desorption (PSD) from KEKB factory copper chambers was measured at the National Synchrotron Light Source (NSLS), located at the Brookhaven Laboratory. The KEKB is an asymmetrical collider recently constructed in Ibaraki, Japan. The collider utilizes two UHV ring chambers, one for a 3.5 GeV positron beam and the other for an 8 GeV electron beam, for B-meson studies. Two each, 1 m long, 94 mm inner diameter, chemically deoxidized copper beam chambers with conflat end flanges, were provided by KEKB to the NSLS, for measurement of PSD. PSD and specular reflection were measured on NSLS VUV ring beamline U9a. It has been reported that a high temperature air bake on large stainless steel vacuum systems reduces the need for a vacuum bake. To determine the effect of surface oxide, following the initial PSD measurement, the chambers were chemically cleaned and then oxidized in air for a week at 150 °C. PSD was remeasured after the air bake. A similar process and measurement was performed on a stai... |
| Databáze: | OpenAIRE |
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