Broadband impedance modeling and single bunch instabilities estimations of the advanced light source upgrade project

Dan Wang,Karl Bane,Derun Li,Tianhuan Luo,Olusola Omolayo,Gregory Penn,Stefano De Santis,Christoph Steier,Marco Venturini

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment（2022）

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摘要

The Advanced Light Source Upgrade (ALS-U) is a 4th generation diffraction-limited soft x-ray radiation source, consisting of a new accumulator ring (AR) and a new storage ring (SR). In both rings coupling-impedance driven instabilities need careful evaluation to ensure meeting the machine’s high-performance goals. This paper presents the workflow followed in building the impedance models and the beam-stability analysis based on those models. We follow the commonly accepted approach of separating the resistive-wall and the geometric parts of the impedance; the former is obtained by analytical formulas, the latter by numerical electro-magnetic codes (primarily CST Studio software) with perfectly-conducting boundary conditions.

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关键词

Broadband impedance,Impedance modeling,Impedance budget,Pseudo-Green function,Single bunch instability,ALS-U project

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