NDLI: Single-bunch instability estimates for the 1-nm APS storage ring upgrade with a smaller vacuum chamber

Content Provider	IEEE Xplore Digital Library
Author	Yong-Chul Chae Yusong Wang Aimin Xiao
Copyright Year	2007
Description	Author affiliation: Argonne Nat. Lab, Argonne (Yong-Chul Chae; Yusong Wang; Aimin Xiao)
Abstract	We recently studied a lattice achieving 1 -nm emittance at the APS storage ring [1]. The successful design required very strong sextupoles in order to tune the machine to the desired positive chromaticity. A preliminary design of such magnets indicated saturation in the poles unless the vacuum chamber gets smaller by a factor of two compared to the existing APS chamber. Since the resistive wall impedance scales as $1/b^{3},$ where b is the radius of the chamber, we questioned how much current we can store in a single bunch at the 1-nm storage ring. In order to answer this question quantitatively, we calculated all wake potentials of impedance elements of the existing APS storage ring with the transverse dimension properly scaled but with the longitudinal dimension kept unchanged. With the newly calculated impedance of a smaller chamber, we estimated the single- bunch current limit. It turned out that the ring with a smaller chamber would not diminish the single-bunch current limit substantially. We present both wake potentials of 1-nm and the existing rings followed by the simulation results carried out for determining the accumulation limit to the ring.
Starting Page	4330
Ending Page	4332
File Size	232554
Page Count	3
File Format	PDF
ISBN	9781424409167
DOI	10.1109/PAC.2007.4440002
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Storage rings Impedance Lattices Magnets Boundary conditions Undulators Apertures Boring Contracts
Content Type	Text
Resource Type	Article

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