Speaker
Description
The NSLS-II upgrade (NSLS-IIU) will operate with short, intense electron bunches in small-aperture vacuum chambers, making longitudinal impedance a critical limitation for beam intensity and beam-induced heating. As a first step toward a full collective-effects model, we compute the longitudinal impedances of key NSLS-IIU vacuum components such as complex-bend chambers, tapers, shielded flanges, and bellows using 3D electromagnetic wakefield simulations. The results are assembled into a preliminary longitudinal impedance budget that identifies the dominant contributors and the most relevant frequency ranges for single-bunch instability studies. This work provides design guidance for NSLS-IIU vacuum components and defines benchmarks for upcoming bench and beam-based impedance measurements.
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