Diagnosis of optical errors with a precision BPM system at CESR

Author

Smith, J.C. ; Palmer, M.A. ; Rubin, D.L. ; Sagan, D.C.

Author_Institution

Cornell Univ., Ithaca, NY, USA

Volume

4

fYear

2003

fDate

12-16 May 2003

Firstpage

2267

Abstract

In the Cornell Electron Storage Ring (CESR) multibunch beams of electrons and positrons share a common vacuum chamber and guide field. A new precision beam position monitor system, with bunch-by-bunch measurement capability, is now in operation in one sector of the CESR ring including the interaction region (IR). Two of our position monitors are located 67 cm on either side of the interaction point (IP) within the IT experimental solenoid. By measuring the relative positions of electron and positron bunches at these detectors we can obtain information about the displacement of the beams at the collision point with an anticipated resolution on the order of the vertical beam size. The measurement of the dependence of beam trajectories at these IR beam position monitors (IRBPMs) on changes in the ring steering elements provides a powerful diagnostic of guide field errors in the interaction region.

Keywords

electron accelerators; particle beam bunching; particle beam diagnostics; storage rings; BPM system; CESR; Cornell Electron Storage Ring; IR beam position monitors; IT experimental solenoid; beam position monitor system; beam trajectories; bunch-by-bunch measurement capability; guide field; interaction point; interaction region; multibunch electron beams; optical errors; positron beam; ring steering elements; vacuum chamber; vertical beam size; Displacement measurement; Electron beams; Extraterrestrial measurements; Magnetic field measurement; Monitoring; Optical coupling; Orbits; Phase measurement; Position measurement; Positrons;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1289087

Filename

1289087