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Description
The 500 MHZ Elettra type cavity have been implemented in the 3rd generation light source Elettra Synchrotron Light Source since the beginning of its operations. It is a normal conducting, single cell cavity with no High Order Modes (HOM) dedicated dampers. The very same cavity will be used for the new low emittance Elettra 2.0 (E2.0) project. E2.0 will host four independent RF accelerating cavities, each one fed with its own amplifier. A complete investigation of the possible coupled bunch longitudinal and transverse instabilities has been carried out due to the most demanding beam quality requirement together with the installation constrains given by the new vacuum chamber of the E2.0 lay-out with respect to the Elettra storage ring. Results in time domain and frequency domain up to 7 GHz have been double-checked. Some high impedance high frequency longitudinal modes have been identified thanks to his analysis. The feasibility to realize a dedicated dumper for the most dangerous modes that could also fit the available room is also investigated.
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