Speaker
Description
In a collaborative work between ALBA and KEK the computation of the microwave instability threshold of the current ALBA ring was initiated. This analysis involves solving the dispersion relation equation and conducting simulations using a Vlasov-Fokker-Planck (VFP) solver. The longitudinal wake fields of geometric origin of all vacuum elements were computed with GdfidL using a bunch whose length is at least 5x smaller than the bunch length given by usual 3MV RF-voltage applied at ALBA. The resistive wall contribution was computed at first as longitudinal impedance by IW2D** to be converted in a second step into wake fields via Fourier transform. The CSR contribution will also be considered. The impact of the 3 types of wakes on the microwave instability will be studied. The microwave instability single bunch threshold will be computed combining the 3 contributions. This work also serves as a preparation of the future evaluation of the microwave instability of the ALBA upgrade, which is expected for 2030.
Footnotes
S.Dastan et al., PRAB 27, 104401 (2024).
Y.Cai et al., PR-STAB 12, 061002 (2009).
W.Bruns, www.gdfidl.de
**N.Mounet, https://gitlab.cern.ch/IRIS/IW2D
| Region represented | Europe |
|---|---|
| Paper preparation format | LaTeX |
