An Instrument Design for the Accurate Determination of the Electron Beam Location in the Linac Coherent Light Source Undulator

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The Linac Coherent Light Source (LCLS), currently under design, requires accurate alignment between the electron beam and each undulator's magnetic centerline. A beam finder wire (BFW) instrument has been developed to provide beam location information that is used to move the undulators to their appropriate positions. A BFW instrument is mounted at each of the 33 magnets in the undulator section. Beam detection is achieved by electrons impacting two carbon fiber wires and then sensing the downstream radiation. The wires are mounted vertically and horizontally on a wire card similar to that of a traditional wire scanner instrument. The development ... continued below

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Bailey, J. L.; Capatina, D.; Morgan, J. W. & Nuhn, H. D. January 23, 2008.

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The Linac Coherent Light Source (LCLS), currently under design, requires accurate alignment between the electron beam and each undulator's magnetic centerline. A beam finder wire (BFW) instrument has been developed to provide beam location information that is used to move the undulators to their appropriate positions. A BFW instrument is mounted at each of the 33 magnets in the undulator section. Beam detection is achieved by electrons impacting two carbon fiber wires and then sensing the downstream radiation. The wires are mounted vertically and horizontally on a wire card similar to that of a traditional wire scanner instrument. The development of the BFW presents several design challenges due to the need for high accuracy of the wires locations and the need for removal of the wires during actual operation of the LCLS (30 microns repeatability is required for the wire locations). In this paper, we present the technical specification, design criteria, mechanical design, and results from prototype tests for the BFW.

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  • Journal Name: Conf.Proc.C070625:4324,2007; Conference: Particle Accelerator Conference PAC07 25-29 Jun 2007, Albuquerque, New Mexico

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  • Report No.: SLAC-PUB-13068
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 922593
  • Archival Resource Key: ark:/67531/metadc894606

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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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  • January 23, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 3:40 p.m.

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Bailey, J. L.; Capatina, D.; Morgan, J. W. & Nuhn, H. D. An Instrument Design for the Accurate Determination of the Electron Beam Location in the Linac Coherent Light Source Undulator, article, January 23, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc894606/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.