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TY - CONF AU - Wang, D. AU - Bane, K.L.F. AU - Bereguer, R. AU - Cui, T. AU - De Santis, S. AU - Gach, P. AU - Li, D. AU - Luo, T.H. AU - Miller, T. AU - Oliver, T. AU - Omolayo, O. AU - Steier, C. AU - Swain, T.L. AU - Venturini, M. AU - Wang, G. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - The Broad-Band Impedance Budget in the Storage Ring of the ALS-U Project 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 - Design work is underway for the upgrade of the Advanced Light Source (ALS-U) to a diffraction-limited soft x-rays radiation source. Like other 4th-generation light source machines, the ALS-U multiple-bend achromat storage-ring (SR) is potentially sensitive to beam-coupling impedance effects. This paper presents the SR broad-band impedance budget in both the longitudinal and transverse planes. In our modeling we follow the commonly accepted approach of separating the resistive-wall and the geometric parts of the impedance, the former being described by analytical formulas and the latter obtained by numerical electromagnetic codes (primarily CST Studio software) assuming perfectly conducting materials. We discuss the main sources of impedance. Results of our analysis are the basis for the single bunch instability study and would feedback on the design of critical vacuum components. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2779 EP - 2782 KW - impedance KW - vacuum KW - cavity KW - wakefield KW - storage-ring DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-WEPAB081 UR - https://jacow.org/ipac2021/papers/wepab081.pdf ER -