Abstract
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.
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