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Description
Elettra 2.0 is the planned diffraction-limited upgrade of the Elettra storage ring, and its performance critically depends on a reliable impedance model. An initial impedance budget was previously established using analytical formulas and simplified geometries for the main vacuum components. As the mechanical design of most elements is now finalized, we have revisited this budget using detailed 3D electromagnetic simulations. In this paper, we present an updated longitudinal and transverse impedance model, with particular emphasis on scrapers, collimators, and taper transitions, which are among the dominant localized sources. Wakefields and impedances are evaluated with the WAKIS code and CST simulations starting from the finalized CAD models. The numerical results are systematically compared with the earlier analytical estimates, quantifying the level of agreement and highlighting components where realistic 3D features introduce non-negligible corrections. The updated impedance budget provides a more robust basis for future beam dynamics and collective-effect studies for Elettra 2.0.
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