PAC09 - List of Authors (O'Connell, T.I.)

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O'Connell, T.I.

Paper	Title	Page
TH5RFP029	Design and Implementation of CESRTA Superconducting Wiggler Beampipes with Thin Retarding Field Analyzers	3507
	Y. Li, M.G. Billing, S. Greenwald, T.I. O'Connell, M.A. Palmer, J.P. Sikora, E.N. Smith, K.W. Smolenski CLASSE, Ithaca, New York J.N. Corlett, R. Kraft, D.V. Munson, D.W. Plate, A.W. Rawlins LBNL, Berkeley, California K. Kanazawa, Y. Suetsugu KEK, Ibaraki M.T.F. Pivi SLAC, Menlo Park, California
	Funding: Work supported by the National Science Foundation, the US Department of Energy, and the Japan/US Cooperation Program Wiggler magnets are one of the key components in the ILC Damping Ring. It is critical to the ILCDR GDE to understand electron cloud (EC) growth and patterns, and to develop EC suppression techniques in the wiggler beampipes. The CESR-c superconducting wigglers, closely matching the parameters of the ILCDR wigglers, serve as unique testing vehicles. As part of the CesrTA project, we replaced the copper beampipes of two SCWs with EC diagnostic beampipes, where one of the beampipes is uncoated and the second is coated with a thin TiN film. Each of the EC diagnostic beampipes is equipped with three retarding field analyzers (RFAs) at strategic longitudinal locations in the wiggler field. Each of the RFAs has 12-fold segmentation to measure the horizontal EC density distribution. To maintain sufficient vertical beam aperture and to fit within the SCW warm bore, a thin style of RFA (with a thickness of 2.5 mm) has been developed and deployed. These SCWs with RFA-equipped beampipe have been installed and successfully operated in the re-configured CesrTA vacuum system. This paper describes the design and the construction of the RFA-equipped SCW beampipes and operational experience.

Paper

Title

Page

TH5RFP029

Design and Implementation of CESRTA Superconducting Wiggler Beampipes with Thin Retarding Field Analyzers

3507

Y. Li, M.G. Billing, S. Greenwald, T.I. O'Connell, M.A. Palmer, J.P. Sikora, E.N. Smith, K.W. Smolenski
CLASSE, Ithaca, New York
J.N. Corlett, R. Kraft, D.V. Munson, D.W. Plate, A.W. Rawlins
LBNL, Berkeley, California
K. Kanazawa, Y. Suetsugu
KEK, Ibaraki
M.T.F. Pivi
SLAC, Menlo Park, California

Funding: Work supported by the National Science Foundation, the US Department of Energy, and the Japan/US Cooperation Program

Wiggler magnets are one of the key components in the ILC Damping Ring. It is critical to the ILCDR GDE to understand electron cloud (EC) growth and patterns, and to develop EC suppression techniques in the wiggler beampipes. The CESR-c superconducting wigglers, closely matching the parameters of the ILCDR wigglers, serve as unique testing vehicles. As part of the CesrTA project, we replaced the copper beampipes of two SCWs with EC diagnostic beampipes, where one of the beampipes is uncoated and the second is coated with a thin TiN film. Each of the EC diagnostic beampipes is equipped with three retarding field analyzers (RFAs) at strategic longitudinal locations in the wiggler field. Each of the RFAs has 12-fold segmentation to measure the horizontal EC density distribution. To maintain sufficient vertical beam aperture and to fit within the SCW warm bore, a thin style of RFA (with a thickness of 2.5 mm) has been developed and deployed. These SCWs with RFA-equipped beampipe have been installed and successfully operated in the re-configured CesrTA vacuum system. This paper describes the design and the construction of the RFA-equipped SCW beampipes and operational experience.