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1.
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Device and Technique for In-situ Coating of the RHIC Cold Bore Vacuum Tubes with Thick OFHC
/ Hershcovitch, Ady (RIKEN BNL) ; Blaskiewicz, Michael (RIKEN BNL) ; Brennan, Joseph (RIKEN BNL) ; Fischer, Wolfram (RIKEN BNL) ; Liaw, Chong-Jer (RIKEN BNL) ; Meng, Wuzheng (RIKEN BNL) ; Todd, Robert (RIKEN BNL) ; Custer, Art (Unlisted, US) ; Erickson, Mark (Unlisted, US) ; Jamshidi, Nader (Unlisted, US) et al.
To mitigate electron clouds & unacceptable ohmic heating problems in RHIC, we developed a robotic plasma deposition technique & device to in-situ coat the RHIC 316LN SS cold bore tubes based on mobile mole mounted magnetrons for OFHC deposition. Scrubbed Cu has low SEY and suppress electron cloud formation. [...]
2013 - 3 p.
- Published in : (2013) , pp. THPFI093
Fulltext: PDF; External link: Published version from JACoW
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.3508
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2.
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Recent RHIC in-situ coating technology developments
/ 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. et al.
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. [...]
arXiv:1308.0125.-
2013-04-22 - 8 p.
- Published in : AIP Conf. Proc. C: 1206051 (2013) , pp. 251-258
Preprint: PDF; Published version from CERN: PDF; External link: Preprint
In : ECLOUD’12: Joint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects, pp.251-258
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3.
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Development of NEG Coating for RHIC Experimental Beamtubes
/ Weiss, Daniel ; He, Ping ; Hseuh Hsiao Chaun ; Todd, Robert J
As RHIC beam intensity increases beyond original scope, pressure rises in some regions have been observed. The luminosity limiting pressure rises are associated with electron multi-pacting, electron stimulated desorption and beam induced desorption. [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3120
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4.
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Summary on Titanium Nitride Coating of SNS Ring Vacuum Chambers
/ Todd, Robert J ; He, Ping ; Hseuh Hsiao Chaun ; Weiss, Daniel
The inner surfaces of the 248 m Spallation Neutron Source (SNS) accumulator ring vacuum chambers are coated with ~100 nm of titanium nitride (TiN) to reduce the secondary electron yield (SEY) of the chamber walls. There are approximately 100 chambers and kicker modules, some up to 5 m in length and 36 cm in diameter, coated with TiN. [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3088
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5.
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Physical and Electromagnetic Properties of Customized Coatings for SNS Injection Ceramic Chambers and Extraction Ferrite Kickers
/ Hseuh Hsiao Chaun ; Blaskiewicz, Michael ; He, Ping ; Henderson, Stuart ; Pai, Chien ; Raparia, Deepak ; Todd, Robert J ; Wang, Lanfa ; Wei, Jie ; Weiss, Daniel et al.
The inner surfaces of the 248 m SNS accumulator ring vacuum chambers are coated with ~100 nm of titanium nitride (TiN) to reduce the secondary electron yield (SEY) of the chamber walls. All the ring inner surfaces are made of stainless or inconel, except those of the injection and extraction kickers. [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3028
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6.
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Upgrade of RHIC Vacuum Systems for High Luminosity Operation
/ Hseuh Hsiao Chaun ; Mapes, Michael ; Smart, Loralie ; Todd, Robert J ; Weiss, Daniel
With increasing ion beam intensity during recent RHIC operations, pressure rises of several decades were observed at most room temperature sections and at a few cold sections. The pressure rises are associated with electron multi-pacting, electron stimulated desorption and beam ion induced desorption and have been one of the major intensity and luminosity limiting factors for RHIC. [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2977
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7.
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A Summary and Status of the SNS Ring Vacuum Systems
/ Mapes, Michael ; Hechler, Michael ; Hseuh Hsiao Chaun ; Ladd, Peter ; Rank, Jim ; Smart, Loralie ; Todd, Robert J ; Weiss, Daniel
The Spallation Neutron Source (SNS) ring is designed to accumulate high intensity protons. The SNS ring vacuum system consists of the High Energy Beam Transport (HEBT) line, Accumulator Ring and the Ring to Target Beam Transport (RTBT) line [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2929
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8.
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Construction and Power Test of the Extraction Kicker Magnet for the Spallation Neutron Source Accumulator Ring
/ Pai, Chien ; Hahn, Harald ; Hseuh Hsiao Chaun ; Meng, Wuzheng ; Mi, Jian-Lin ; Raparia, Deepak ; Sandberg, Jon ; Todd, Robert J ; Tsoupas, Nicholaos ; Tuozzolo, Joseph et al.
Two extraction kicker magnet assemblies that contain seven individual pulsed magnet modules each will kick the proton beam vertically out of the SNS accumulator ring into the aperture of the extraction lambertson septum magnet. The proton beam then travels to the 1.4 MW SNS target assembly. [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3831
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9.
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Straightforward elucidation of complex shell-model states by the .beta.-decay of nuclei far from
/ McHarris, W C ; Eppley, R E ; Kelly, W H ; Todd, R R ; Warner, R A
Geneva : CERN, 1970
Published version from CERN: PDF;
In : International Conference on the Properties of Nuclei far from the Region of, $\beta$ Stability, v.1, Leysin, Switzerland, 31 Aug 1970, pp.435-446 (CERN-1970-030-V-1)
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10.
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Design and implementation of SNS ring vacuum system with suppression of electron cloud instability
/ Hseuh, H ; Blaskiewicz, M ; He, P ; Mapes, M ; Todd, R ; Wang, L ; Wei, J ; Zhang, S Y
Upton, NY : CERN, 2005
Published version from CERN: PDF;
In : 31st Advanced ICFA Beam Dynamics Workshop on Electron-Cloud Effects, Napa, CA, USA, 19 - 23 Apr 2004, pp.119-122 (CERN-2005-001)
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