Interpretation of transverse tune spectra in a heavy-ion synchrotron at high intensities

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Abstract

Two different tune measurement systems have been installed in the GSI Helmholtzzentrum für Schwerionenforschung heavy-ion synchrotron SIS-18. Tune spectra are obtained with high accuracy using these fast and sensitive systems. Besides the machine tune, the spectra contain information about the intensity dependent coherent tune shift and the incoherent space charge tune shift. The space charge tune shift is derived from a fit of the observed shifted positions of the synchrotron satellites to an analytic expression for the head-tail eigenmodes with space charge. Furthermore, the chromaticity is extracted from the measured head-tail mode structure. The results of the measurements provide experimental evidence of the importance of space charge effects and head-tail modes for the interpretation of transverse beam signals at high intensity. Published by the American Physical Society. Published by the American Physical Society under the terms of the xlink:href=http:// creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Singh, R., Boine-Frankenheim, O., Chorniy, O., Forck, P., Haseitl, R., Kaufmann, W., … Weiland, T. (2013). Interpretation of transverse tune spectra in a heavy-ion synchrotron at high intensities. Physical Review Special Topics - Accelerators and Beams, 16(3). https://doi.org/10.1103/PhysRevSTAB.16.034201

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