Design Progress of ALS-U 3rd-Harmonic Cavity Article Swipe

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Computer science

Tianhuan Luo , K. Baptiste , Stefano De Santis , Hanqi Feng , Derun Li , J. Staples , Marco Venturini ·

YOU? · · 2021 · Open Access · · DOI: https://doi.org/10.18429/jacow-ipac2021-tupab053 · OA: W3201836941

A higher-harmonic rf cavity (HHC) system is required in the ALS-U storage ring to lengthen the bunches, reduce intrabeam-scattering effects, and improve Touschek beam lifetime. A 3rd harmonic, normal conducting, passive-cavity system has been chosen based on beam-dynamics requirements and cost considerations. We have explored two options for ALS-U 3HC system: a high-R/Q re-entrant cavity with waveguide HOM dampers, and a low-R/Q system with two elliptical cavities and HOM beam line absorbers. In this paper, we present the recent progress on the cavity design and related beam dynamics studies.