IN VACUUM UNDULATOR TASK FORCE REPORT

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Description

The Green-Chasman lattice, which is the basis for both NSLS storage rings, was conceived with insertion devices in mind. Long, field-free straight sections were provided in the design. The electron optics were chosen so that these sections had zero dispersion and the effects of new magnetic structures placed in these regions would have minimal effect on the emittance of the electron beam. This design concept has been followed by all high-brightness rings which were built subsequent to the NSLS. The X-Ray Ring straight sections also have a very small vertical {beta} function, in addition to the zero dispersion. This was ... continued below

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43 pages

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HASTINGS,J.B.; KAO,C.C.; STEFAN,P.; BURLEY,S.; CARGILL,G.S.; CHANCE,M. et al. June 1, 1998.

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Description

The Green-Chasman lattice, which is the basis for both NSLS storage rings, was conceived with insertion devices in mind. Long, field-free straight sections were provided in the design. The electron optics were chosen so that these sections had zero dispersion and the effects of new magnetic structures placed in these regions would have minimal effect on the emittance of the electron beam. This design concept has been followed by all high-brightness rings which were built subsequent to the NSLS. The X-Ray Ring straight sections also have a very small vertical {beta} function, in addition to the zero dispersion. This was done to optimize the brightness of wiggler sources. There is a further benefit however. The {beta} function determines the beam size and divergence at a particular point in the storage ring lattice. The size is proportional to {radical}{beta} and the divergence is proportional to 1/{radical}{beta}. Thus the electron beam is very small at the center of the X-Ray Ring straight sections. In the initial development of the insertion device program, no specific advantage was taken of this feature. Of the eight straight sections in the X-Ray Ring lattice, five are readily available for magnetic insertion devices and the remaining three are dedicated to radio-frequency drive cavities (2) and injection (1).

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43 pages

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INIS; OSTI as DE00757109

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  • Other Information: PBD: 1 Jun 1998

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  • Report No.: BNL--65581
  • Report No.: KC020204
  • Grant Number: AC02-98CH10886
  • DOI: 10.2172/757109 | External Link
  • Office of Scientific & Technical Information Report Number: 757109
  • Archival Resource Key: ark:/67531/metadc710365

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Office of Scientific & Technical Information Technical Reports

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  • June 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 9, 2015, 12:37 p.m.

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HASTINGS,J.B.; KAO,C.C.; STEFAN,P.; BURLEY,S.; CARGILL,G.S.; CHANCE,M. et al. IN VACUUM UNDULATOR TASK FORCE REPORT, report, June 1, 1998; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc710365/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.