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DOE OSTI · 1787819

NSLS-II longitudinal impedance budget

Blednykh, Alexei·Bassi, G.·Hetzel, C.·Kosciuk, B.·Smaluk, V.
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Abstract

From the beginning of the NSLS-II project, the vacuum chamber of the NSLS-II storage ring has been optimized to reduce its impedance. The optimization, performed in close collaboration with the Diagnostic, Vacuum, RF, and Mechanical Engineering groups, has been achieved via calculating the impedance of the vacuum chamber components with the use of both analytical and numerical tools, with the numerical computations carried out with the GdfidL code. Fore reliable NSLS-II operation with the total beam current of 500 mA, each component of the vacuum chamber has been individually optimized to minimize the beam-induced heating and to prevent single-bunch and coupled-bunch instabilities. In this study, the impedance calculation and optimization know-how are summarized for all the chamber components, and the total longitudinal impedance budget is analyzed. As a result of this extensive research and engineering effort, the design beam current of 500 mA has been recently accumulated in NSLS-II without any major problem caused by collective effects.

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Blednykh, Alexei, Bassi, G., Hetzel, C., Kosciuk, B., Smaluk, V.. 2021-04-29. NSLS-II longitudinal impedance budget. https://doi.org/10.1016/j.nima.2021.165349

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