CERN Accelerating science

Article
Report number	arXiv:1308.0125
Title	Recent RHIC in-situ coating technology developments
Author(s)	Hershcovitch, A. (Brookhaven) ; Blaskiewicz, M. (Brookhaven) ; Brennan, J.M. (Brookhaven) ; Chawla, A. (Brookhaven) ; Fischer, W. (Brookhaven) ; Liaw, C-J (Brookhaven) ; Meng, W. (Brookhaven) ; Todd, R. (Brookhaven) ; Custer, A. ; Erickson, M. ; Jamshidi, N. ; Kobrin, P. ; Laping, R. ; Poole, H.J. ; Jimenez, J.M. (CERN) ; Neupert, H. (CERN) ; Taborelli, M. (CERN) ; Yin-Vallgren, C. (CERN) ; Sochugov, N. (Tomsk, Inst. H. C. Electronics)
Publication	2013-04-22
Imprint	01 Aug 2013
Number of pages	8
Note	Comments: 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 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
In:	AIP Conf. Proc. C 1206051 (2013) pp.251-258
In:	ECLOUD’12: Joint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects, pp.251-258
DOI	10.5170/CERN-2013-002.251
Subject category	Accelerators and Storage Rings
Abstract	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.
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