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TY - CONF AU - Luo, T.H. AU - Baptiste, K.M. AU - De Santis, S. AU - Feng, H.Q. AU - Li, D. AU - Staples, J.W. AU - Venturini, M. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Design Progress of ALS-U 3rd-Harmonic Cavity J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - 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. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1481 EP - 1484 KW - cavity KW - HOM KW - damping KW - impedance KW - simulation DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-TUPAB053 UR - https://jacow.org/ipac2021/papers/tupab053.pdf ER -