Speaker
Description
Many synchrotron light sources are in the stage of an upgrade to new-generation accelerators. These upgrades typically aim to reduce the transverse emittances by one or two orders of magnitude. Horizontal and vertical beta-functions are also smaller to further reduce the beam size at source points. At the same time, the beam energy typically remains unchanged. In these conditions, effects atypical for a synchrotron light source, such as space charge and intrabeam scattering, become relevant. This was first reported in [1] for PETRA IV and SOLEIL II storage rings.
In the SOLEIL II storage ring, the space charge tune shift is estimated to be in the order of 0.001 to 0.01, similar to the synchrotron tune. The space charge parameter, ratio of space-charge tune shift to the synchrotron tune, is in the range of 1 to 10, which is indicative of Landau damping. In this contribution, we report the findings for SOLEIL II in terms of beam instabilities and full betatron coupling operation. Additionally, we predict the effect of space-charge in an already finished upgrade ESRF-EBS.
[1] S. A. Antipov, V. Gubaidulin, I. Agapov, E. C. Cortés García, and A. Gamelin, “Space charge effects in fourth-generation light sources: The PETRA IV and SOLEIL II cases,” Phys. Rev. Accel. Beams, vol. 28, no. 2, p. 024401, Feb. 2025, doi: 10.1103/PhysRevAccelBeams.28.024401.