Author: Wang, D.
Paper Title Page
MOZBA6 The Broad-Band Impedance Budget of the Accumulator Ring in the ALS-U Project 74
MOPLM26   use link to see paper's listing under its alternate paper code  
  • D. Wang, S. De Santis, D. Li, T.H. Luo, M. Venturini
    LBNL, Berkeley, California, USA
  • K.L.F. Bane
    SLAC, Menlo Park, California, USA
  Design work is underway for the upgrade of the Advanced Light Source (ALS-U) to a diffraction-limited soft x-rays radiation source. It consists of an accumulator and a storage ring. In both rings, coupling-impedance driven instabilities need careful evaluation to ensure meeting the machine high-performance goals. This paper presents the impedance budget of the accumulator ring both longitudinally and transversely. The budget includes the resistive wall impedance as well as the geometric impedance from the main vacuum components. Our calculations primarily rely on electromagnetic simulations with the CST code; when possible validation has been sought against analytical modeling, typically in the low-frequency limit, and good agreement generally found. Collective-instability current thresholds are also discussed.  
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About • paper received ※ 27 August 2019       paper accepted ※ 06 September 2019       issue date ※ 08 October 2019  
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