Measurement of Transverse Impedance of Specific Components in CESR Using BPM Measurements of Pinged Bunches

A beam-based technique is applied to determine the quadrupole impedance of large-impedance components of the CESR storage ring. Two bunches separated by 1/3 of the ring circumference are charged to 1.44 × 1010 and 0.48 × 1010 N/bunch (0.9 and 0.3 mA). Both bunches are given a single kick of the same...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 1067; no. 6; pp. 62010 - 62014
Main Authors Ehrlichman, M. P., Wang, S. T., Shanks, J.
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.09.2018
Subjects
Collimators
Electrostatic separators
Impedance
Physics
Quadrupoles
Scrapers
Separators
Spectrum analysis
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Summary:A beam-based technique is applied to determine the quadrupole impedance of large-impedance components of the CESR storage ring. Two bunches separated by 1/3 of the ring circumference are charged to 1.44 × 1010 and 0.48 × 1010 N/bunch (0.9 and 0.3 mA). Both bunches are given a single kick of the same amplitude. Turn-by-turn, bunch-by-bunch position information is recorded for 16 k turns. BPM-by-BPM phase is calculated using the All-phase FFT method of spectral analysis. The difference in the BPM-to-BPM phase advance between the two bunches is a measurement of the local transverse impedance. The impedances of a small-aperture in-vacuum undulator, collimators, scrapers, RF cavities, electrostatic separators, and bulk impedance of the remaining ring are determined in this manner.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1067/6/062010