Observation of strong-strong and other beam-beam effects in RHIC

Author

Fischer, Wolf-Joachim ; Blaskiewicz, M. ; Brennan, J.M. ; Cameron, P. ; Connolly, R. ; Montag, C. ; Peggs, S. ; Pilat, F. ; Ptitsyn, V. ; Tepikian, S. ; Trbojevic, D.

Author_Institution

Brookhaven Nat. Lab., Upton, NY, USA

Volume

1

fYear

2003

fDate

12-16 May 2003

Firstpage

135

Abstract

RHIC is currently the only hadron collider in which strong-strong beam-beam effects can be seen. For the first time, coherent beam-beam modes were observed in a bunched beam hadron collider. Other beam-beam effects in RHIC were observed in operation and in dedicated experiments with gold ions, deuterons and protons. Observations include measurements of beam-beam induced tune shifts, lifetime and emittance growth measurements with and without beam-beam interaction, and background rates as a function of tunes. During ramps unequal radio frequencies in the two rings cause the crossing points to move longitudinally. Thus bunches experience beam-beam interactions only in intervals and the tunes are modulated. In this article we summarize the most important beam-beam observations made so far.

Keywords

ion accelerators; particle beam bunching; particle beam diagnostics; synchrotrons; RHIC; beam-beam effects; beam-beam induced tune shifts; emittance growth measurements; hadron collider; lifetime; ramps; strong-strong beam-beam effects; unequal radio frequencies; Acceleration; Colliding beam devices; Gold; Niobium; Optical coupling; Protons; Superconducting magnets; Switches; Synchrotrons; US Department of Energy;

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.2003.1288861

Filename

1288861