A potpourri of impedance measurements at the Advanced Photon Source storage ring

Author

Sereno, N.S. ; Chae, Y.-C. ; Harkay, K.C. ; Lumpkin, A.H. ; Milton, S.V. ; Yang, B.X.

Author_Institution

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

Volume

2

fYear

1997

fDate

12-16 May 1997

Firstpage

1700

Abstract

Machine coupling impedances were determined in the APS storage ring from measurements of the bunch length, synchronous phase, and synchrotron and betatron tunes vs. single-bunch current. The transverse measurements were performed for various numbers of small gap insertion device (ID) chambers installed in the ring. The transverse impedance is determined from measurements of the transverse tunes and bunch length as a function of single-bunch current. The shift in the synchrotron tune was measured as a function of bunch current from which the total cavity impedance was extracted. The loss factor was determined by measuring the relative synchronous phase as a function of bunch current. The longitudinal resistive impedance is calculated using the loss factor dependence on the bunch length. From these results, we can estimate what the impedance would be for a full set of ID chambers

Keywords

X-ray production; accelerator cavities; electron accelerators; particle beam bunching; particle beam diagnostics; storage rings; synchrotrons; APS storage ring; Advanced Photon Source storage ring; betatron tunes; bunch length; impedance measurements; longitudinal resistive impedance; loss factor; machine coupling impedances; single-bunch current; small gap insertion device; synchronous phase; synchrotron tunes; total cavity impedance; transverse measurements; Current measurement; Frequency; Impedance measurement; Length measurement; Loss measurement; Magnetic field measurement; Phase measurement; Storage rings; Synchrotrons; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.750806

Filename

750806