Retuning the APS storage ring for better chromaticity correction.

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Description

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. ... continued below

Physical Description

13 p.

Creation Information

Chae, Y.-C. & Crosbie, E.A. September 11, 1999.

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Description

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.

Physical Description

13 p.

Notes

INIS; OSTI as DE00012097

Medium: P; Size: 13 pages

Source

  • Other Information: PBD: 11 Sep 1999

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  • Report No.: LS-279
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/12097 | External Link
  • Office of Scientific & Technical Information Report Number: 12097
  • Archival Resource Key: ark:/67531/metadc626657

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 11, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • April 7, 2017, 1:12 p.m.

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Chae, Y.-C. & Crosbie, E.A. Retuning the APS storage ring for better chromaticity correction., report, September 11, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc626657/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.