Outgassing measurements of stacked laminations for use as an electromagnet core
- KEK-High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305 (Japan)
Outgassing from an electromagnet core installed in an accelerator vacuum system is a problem, since it causes a poor vacuum, thus shortening the beam lifetime while also inducing electrical breakdown. Outgassing measurements by a throughput method were carried out for stacked laminations with a few types of insulating coatings. The vacuum performance does not always depend on a small conductance in a narrow gap spacing of a few micrometers, but on the materials coated for electrical insulation. A high-temperature cured inorganic and plasma-sprayed ceramic coating shows a lower outgassing rate than a quasi-inorganic one by an order or more. An outgassing reduction effect by a prebaking treatment is also examined. Furthermore, a time lag in the pumpdown characteristic of the stacked laminations is discussed.
- OSTI ID:
- 20636588
- Journal Information:
- Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films, Vol. 22, Issue 5; Other Information: DOI: 10.1116/1.1786311; (c) 2004 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0734-2101
- Country of Publication:
- United States
- Language:
- English
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