Recent RHIC in-situ coating technology developments
| Autor: | Hershcovitch, A., Blaskiewicz, M., Brennan, J. M., Chawla, A., Fischer, W., Liaw, C-J, Meng, W., Todd, R., Custer, A., Erickson, M., Jamshidi, N., Kobrin, P., Laping, R., Poole, H. J., Jimenez, J. M., Neupert, H., Taborelli, M., Yin-Vallgren, C., Sochugov, N. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | CERN Yellow Report CERN-2013-002, pp.251-258 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.5170/CERN-2013-002.251 |
| Popis: | To rectify the problems of electron clouds observed in RHIC and unacceptable ohmic heating for superconducting magnets that can limit future machine upgrades, we started developing a robotic plasma deposition technique for $in-situ$ coating of the RHIC 316LN stainless steel cold bore tubes based on staged magnetrons mounted on a mobile mole for deposition of Cu followed by amorphous carbon (a-C) coating. The Cu coating reduces wall resistivity, while a-C has low SEY that suppresses electron cloud formation. Recent RF resistivity computations indicate that 10 {\mu}m of Cu coating thickness is needed. But, Cu coatings thicker than 2 {\mu}m can have grain structures that might have lower SEY like gold black. A 15-cm Cu cathode magnetron was designed and fabricated, after which, 30 cm long samples of RHIC cold bore tubes were coated with various OFHC copper thicknesses; room temperature RF resistivity measured. Rectangular stainless steel and SS discs were Cu coated. SEY of rectangular samples were measured at room; and, SEY of a disc sample was measured at cryogenic temperatures. Comment: 8 pages, contribution to the Joint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects: ECLOUD'12; 5-9 Jun 2012, La Biodola, Isola d'Elba, Italy |
| Databáze: | arXiv |
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