Global beta-beating compensation of the ALS W16 wiggler

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The W16 wiggler is the first wiggler and highest field insertion device to be installed in the ALS storage ring. When the gaps of the W16 wiggler are closed, the vertical tune increases by 0.065 and the vertical beta function is distorted by up to {+-}37%. There are 48 quadrupoles in the ring whose fields can be adjusted individually to restore the tunes and partially compensate the beta-beating. In order to adjust the quadrupole field strengths to accurately compensate the focusing, it is necessary to have a method to precisely determine the beta-beating. In this paper we compare measurements of ... continued below

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6 p.

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Robin, D.; Decking, W. & Nishimura, H. May 1, 1997.

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The W16 wiggler is the first wiggler and highest field insertion device to be installed in the ALS storage ring. When the gaps of the W16 wiggler are closed, the vertical tune increases by 0.065 and the vertical beta function is distorted by up to {+-}37%. There are 48 quadrupoles in the ring whose fields can be adjusted individually to restore the tunes and partially compensate the beta-beating. In order to adjust the quadrupole field strengths to accurately compensate the focusing, it is necessary to have a method to precisely determine the beta-beating. In this paper we compare measurements of the induced beta-beating using two methods: measuring the tune dependence on quadrupole field strength and fitting a lattice model with measured response matrices. The fitted model also allows us to predict quadrupole field strengths that will best compensate the beta beating. These quadrupole field strengths are then applied and the resultant beta-beating is measured.

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6 p.

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INIS; OSTI as DE97006560

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  • 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997

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  • Other: DE97006560
  • Report No.: LBNL--39827
  • Report No.: CONF-970503--43
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 489637
  • Archival Resource Key: ark:/67531/metadc674667

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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.

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  • May 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • April 5, 2016, 11:40 a.m.

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Robin, D.; Decking, W. & Nishimura, H. Global beta-beating compensation of the ALS W16 wiggler, article, May 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc674667/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.