Speaker
Description
The SOLARIS 1.5 GeV storage ring featuring a compact 96 m circumference design, operates at currents up to 500 mA with a horizontal emittance of ~6 nm·rad, delivering high-brightness synchrotron radiation from the soft X-ray to ultraviolet range. Head–tail instabilities remain a significant limitation for the stable operation of modern synchrotron light sources, particularly as facilities push toward ultra-low emittance and higher single-bunch currents. In these regimes, strong transverse focusing and reduced momentum compaction significantly increase the sensitivity of betatron motion to both chromaticity and short-range impedance. In this work, we investigate the onset and evolution of head–tail modes in a third-generation storage-ring light source using a high-resolution bunch-by-bunch diagnostics. Growth rates of first- and higher-order head–tail modes are mapped as a function of key parameters including beam current and bunch length. Furthermore, the response of the magnetic lattice is analyzed via Linear Optics for Closed Orbits (LOCO) complemented by single bunch lifetime measurements for different chromaticity settings. These studies provide insight into instability thresholds and lattice behavior, supporting strategies for enhanced operational stability.
| In which format do you inted to submit your paper? | LaTeX |
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