Vacuum Modifications for the Installation of a New CESR-C Fast Luminosity Monitor

Author

Li, Y. ; He, Y. ; Palmer, M.A.

Author_Institution

Laboratory of Elementary-Particle Physics, Cornell University, Ithaca, NY 14853, U.S.A., YL67@CORNELL.EDU

fYear

2005

fDate

16-20 May 2005

Firstpage

2836

Lastpage

2838

Abstract

In order to improve luminosity tuning and maintenance for the CLEO-c high energy physics (HEP) program at the Cornell Electron Storage Ring (CESR), a luminosity monitor using photons from radiative Bhabha events has been installed in the CESR ring. Over 8 meters of CESR vacuum chambers near the interaction region were modified to accommodate this new device. The vacuum modifications were designed to meet two criteria. First, the new vacuum chambers had to provide sufficient horizontal and vertical aperture for photons originating from the interaction point (IP) over a wide range of colliding beam conditions. Secondly, the new vacuum chambers required adequate safety margins for operation at beam energies up to 5.3 GeV for Cornell High Energy Synchrotron Source (CHESS) running. In order to be certain that the vacuum modifications would not give rise to any localized pressure bumps, a detailed calculation of the expected vacuum pressure distribution due to synchrotron radiation flux was carried out. Careful design and planning enabled a successful installation and resumption of CESR operations in record time.

Keywords

Apertures; Copper; Helium; Laboratories; Laser excitation; Monitoring; Storage rings; Strontium; Synchrotron radiation; Vacuum systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the

Print_ISBN

0-7803-8859-3

Type

conf

DOI

10.1109/PAC.2005.1591286

Filename

1591286