JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF AU - Gamelin, A. AU - Gubaidulin, V. AU - Loulergue, A. AU - Marchand, P. AU - Nadolski, L.S. AU - Nagaoka, R. AU - Yamamoto, N. ED - Braun, Hans-Heinrich ED - Chrin, Jan ED - Ganter, Romain ED - Hiller, Nicole ED - Schaa, Volker RW TI - Beam Dynamics Using Superconducting Passive Harmonic Cavities with High Current per Bunch J2 - Proc. of FLS2023, Luzern, Switzerland, 27 August-01 September 2023 CY - Luzern, Switzerland T2 - ICFA Advanced Beam Dynamics Workshop T3 - 67 LA - english AB - In 4th generation synchrotron light sources, harmonic cavities (HCs) are critical components needed to achieve the required performance. They provide longer bunches, which helps to reduce statistical effects (intra-beam scattering and Touschek effect). In "timing" modes, where the bunch spacing is larger than in conventional modes and the number of particles per bunch is higher, this need is even greater. In this article, we present the beam dynamics in the high current per bunch regime and how it interacts with the single bunch collective effects. In particular, a dipole-quadrupole instability is observed above the microwave threshold and a coupling between the dipole and cavity modes is shown to limit bunch lengthening at low current. The effective gain from the use of HCs in terms of lifetime, emittance, and energy spread is also discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 14 EP - 17 KW - cavity KW - dipole KW - synchrotron KW - impedance KW - emittance DA - 2024/01 PY - 2024 SN - 2673-7035 SN - 978-3-95450-224-0 DO - doi:10.18429/JACoW-FLS2023-MO3B2 UR - http://jacow.org/fls2023/papers/mo3b2.pdf ER -