Measurements on Beam-Beam Interaction at SPEAR

Author

Allen, M.A. ; Breidenbach, M. ; Augustin, J.-E. ; Boyarski, A. ; Davies-White, W. ; Dean, N. ; Fischer, G. ; Harris, J.L. ; Karvonen, L. ; Larsen, R.R. ; Lee, M.J. ; Lynch, H.L. ; McConnell, R. ; Morton, P. ; Paterson, J.E. ; Rees, J. ; Richter, B. ; Sabe

Author_Institution

Stanford Linear Accelerator Center Stanford University, Stanford, California 94305

Volume

20

Issue

3

fYear

1973

fDate

6/1/1973 12:00:00 AM

Firstpage

838

Lastpage

842

Abstract

Measurements of luminosity at SPEAR, which were performed at different operational conditions of the storage ring are shown and discussed. The parameters varied are: the current in both beams, the minimum betatron amplitude functions at the collision point, the energy and the vertical betatron frequencies. As a result of these measurements we found that the maximum achievable luminosity is much higher than predicted by the incoherent beam-beam limit using Â¿v = 0.025. We also found that the maximum achievable luminosity is a strong function of the betatron frequencies. After computing the largest linear tuneshifts, we found that the quarter resonance seems to be the limiting effect for beam-beam collision.

Keywords

Current measurement; Degradation; Energy measurement; Frequency; Length measurement; Linear accelerators; Optical coupling; Resonance; Storage rings; Structural beams;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.1973.4327257

Filename

4327257