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Tune Determination of Strongly Coupled Betatron Oscillations in a Fast-Ramping Synchrotron | | Y. Alexahin
; E. Gianfelice-Wendt
; W Marsh
; K. Triplett
; | | Date: |
30 Jan 2013 | | Abstract: | Tune identification - i.e. attribution of the spectral peak to a particular
normal mode of oscillations - can present a significant difficulty in the
presence of strong transverse coupling when the normal mode with a lower
damping rate dominates spectra of Turn-by-Turn oscillations in both planes. The
introduced earlier phased sum algorithm helped to recover the weaker normal
mode signal from the noise, but by itself proved to be insufficient for
automatic peak identification in the case of close phase advance distribution
in both planes. To resolve this difficulty we modified the algorithm by taking
and analyzing Turn-by-Turn data for two different ramps with the beam
oscillation excited in each plane in turn. Comparison of the relative
amplitudes of Fourier components allows for automatic correct tune
identification. The proposed algorithm was implemented in the Fermilab Booster
B38 console application and successfully used in tune, coupling and
chromaticity measurements. | | Source: | arXiv, 1301.7446 | | Services: | Forum | Review | PDF | Favorites | |
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