Bunch purity evolution during APS storage ring top-up operations

Author

Lumpkin, A.H. ; Yao, C.-Y. ; Yang, B.X. ; Toellner, T.

Author_Institution

Adv. Photon Source, Argonne Nat. Lab., IL, USA

Volume

4

fYear

2003

fDate

12-16 May 2003

Firstpage

2411

Abstract

During top-up operations of the Advanced Photon Source (APS) storage ring, a growth of the charge in the buckets on the trailing time side of the target RF buckets was observed in the bunch purity monitor data. This system is based on a photon counting technique that provides subns time resolution with a dynamic range of greater than 10⁶. The satellite bucket growth was related to the number of linac bunches being injected into the particle accumulator ring (PAR) and the adjustment of the 12^th harmonic RF cavity phase. Besides measuring this growth in the +3,+1 buckets relative to the 22 singlets targeted during top-up, we also report a special configuration and extended counting period that detected charge at the 10^-9 level of the target bucket.

Keywords

accelerator RF systems; accelerator cavities; electron accelerators; particle beam bunching; particle beam diagnostics; particle beam injection; photon counting; storage rings; APS storage ring top-up operation; Advanced Photon Source storage ring; bunch purity evolution; bunch purity monitor data; counting period; harmonic RF cavity phase adjustment; linac bunch injection; particle accumulator ring; photon counting technique; satellite bucket growth; subns time resolution; target RF bucket; Current measurement; Dynamic range; Laboratories; Linear particle accelerator; Measurement standards; Monitoring; Satellites; Storage rings; Synchrotrons; Timing;

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.2003.1289137

Filename

1289137