IMPEDANCE ESTIMATION OF DIAMOND CAVITIES

The RF straight section of the Diamond storage ring presently consists of two CESR type SCRF cavities with a provision to install a third cavity in future. The cavities are equipped with HOM loads on the beam tubes which are joined to the adjacent storage ring beam pipe using tapered transitions. The RF cavities and the tapers are simulated with MAFIA, CST Studio and ABCI to estimate their contribution to the total ring impedance. In this paper we present the results of our measurements and simulations which lead us to an estimation of the impedance of the RF straight