Required cavity HOM deQing calculated from probability estimates of coupled bunch instabilities in the APS ring

Author

Emery, L.

Author_Institution

Argonne Nat. Lab., IL, USA

fYear

1993

fDate

17-20 May 1993

Firstpage

3360

Abstract

A method of determining the deQing requirement of individual cavity higher-order modes (HOM) for a multi-cavity RF system is presented and applied to the APS ring. Since HOM resonator frequency values are to some degree uncertain, the HOM frequencies should be regarded as random variables in predicting the stability of the coupled bunch beam modes. A Monte Carlo simulation provides a histogram of the growth rates from which one obtains an estimate of the probability of instability. The damping of each HOM type is determined such that the damping effort is economized, i.e. no single HOM dominates the specified growth rate histogram

Keywords

beam handling equipment; cavity resonators; electron accelerators; particle beam diagnostics; probability; storage rings; APS ring; Monte Carlo simulation; cavity higher-order modes; coupled bunch beam modes; damping; deQing requirement; growth rates; instability; multi-cavity RF system; resonator frequency values; Damping; Histograms; Impedance; Laboratories; Optical coupling; Probability; Radio frequency; Random variables; Resonant frequency; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.309652

Filename

309652