Transverse and longitudinal single bunch instabilities in FCC-ee

Improving the accuracy of the impedance model of an accelerator is important for keeping beam instabilities and power loss under control. Here, by means of the PyHEAD-TAIL tracking code, we first review the longitudinal microwave instability threshold for FCC-ee by taking into account the longitudinal impedance model evaluated so far. Moreover, we present the results of beam dynamics simulations, including both the longitudinal and transverse wakefields due to the resistive wall, in order to evaluate the influence of the bunch length on the transverse mode coupling instability. The results of the transverse beam dynamics are also compared with the Vlasov solver DELPHI.