Comparison of equivalent circuit model and MAFIA calculation for re-entrant and co-axial cavities

In this paper, spreadsheet for the calculation of re-entrant and co-axial cavities for klystron and multiple beam klystron (MBK) have been built using equivalent circuit model. The results from the spreadsheet were compared with those from MAFIA and MicrowaveStudio (MWS), and the errors are within 5% if the validation criterions are satisfied for the equivalent model. So the spreadsheet could be used in the preliminary design of cavity resonator for both klystron and MBK.