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Title: Retuning the APS storage ring for better chromaticity correction.

Abstract

When the APS storage ring was retuned to provide smaller {beta}{sub y} values in the insertion straight sections, it was necessary to increase the vertical tune by at least two units. Since the design values for the horizontal and vertical tunes are 35.22 and 16.30, respectively, this put the tunes dangerously close to the sextupole 2v{sub y}-v{sub x} coupling resonance. The large injection horizontal oscillations could couple to the vertical plane and exceed the 5-mm vertical apertures that exist in some of the insertion straight sections. To avoid this resonance, the vertical tune was raised beyond the resonance to 19.30. The result was a reduction in the ability of the chromaticity sextuples to correct the chromaticity. Recent investigation has shown that the chromaticity correction capability of the sextuples can be greatly increased by a modest increase in the horizontal tune. Increasing the horizontal tune by one unit and reducing the vertical tune by three units produces a lattice with better chromaticity control while maintaining an acceptable dynamic aperture.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
12097
Report Number(s):
LS-279
TRN: US0102358
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 11 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ADVANCED PHOTON SOURCE; TUNING; BEAM INJECTION; APERTURES; DESIGN; OSCILLATIONS; CHROMATIC ABERRATIONS; BEAM OPTICS

Citation Formats

Chae, Y.-C., and Crosbie, E.A. Retuning the APS storage ring for better chromaticity correction.. United States: N. p., 1999. Web. doi:10.2172/12097.
Chae, Y.-C., & Crosbie, E.A. Retuning the APS storage ring for better chromaticity correction.. United States. doi:10.2172/12097.
Chae, Y.-C., and Crosbie, E.A. Sat . "Retuning the APS storage ring for better chromaticity correction.". United States. doi:10.2172/12097. https://www.osti.gov/servlets/purl/12097.
@article{osti_12097,
title = {Retuning the APS storage ring for better chromaticity correction.},
author = {Chae, Y.-C. and Crosbie, E.A.},
abstractNote = {When the APS storage ring was retuned to provide smaller {beta}{sub y} values in the insertion straight sections, it was necessary to increase the vertical tune by at least two units. Since the design values for the horizontal and vertical tunes are 35.22 and 16.30, respectively, this put the tunes dangerously close to the sextupole 2v{sub y}-v{sub x} coupling resonance. The large injection horizontal oscillations could couple to the vertical plane and exceed the 5-mm vertical apertures that exist in some of the insertion straight sections. To avoid this resonance, the vertical tune was raised beyond the resonance to 19.30. The result was a reduction in the ability of the chromaticity sextuples to correct the chromaticity. Recent investigation has shown that the chromaticity correction capability of the sextuples can be greatly increased by a modest increase in the horizontal tune. Increasing the horizontal tune by one unit and reducing the vertical tune by three units produces a lattice with better chromaticity control while maintaining an acceptable dynamic aperture.},
doi = {10.2172/12097},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}