Collective Effects in the NICA Collider

Collective effects in the NICA collider are considered taking into account the results of calculations of induced electromagnetic fields (wakes) and coupling impedances of vacuum-chamber elements [1]. Coulomb shifts of longitudinal and transverse oscillations are considered and the stability of coherent oscillations in the presence of these shifts is analyzed; their influence is significant, since it can lead to the Loss of Landau Damping (LLD). Special attention is given to transverse head–tail instabilities and longitudinal instabilities caused by High-Order Modes (HOM) of the cavities. Recommendations on the suppression of instabilities are formulated.