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Capatina, D.

Paper Title Page
FRPMN102 An Instrument Design for the Accurate Determination of the Electron Beam Location in the Linac Coherent Light Source Undulator 4324
 
  • J. L. Bailey, D. Capatina, J. W. Morgan
    ANL, Argonne, Illinois
  • H.-D. Nuhn
    SLAC, Menlo Park, California
  
  Funding: Work supported by U. S. Department of Energy, under Contract Nos. DE-AC02-06CH11357 and DE-AC03-76SF00515.

The Linac Coherent Light Source (LCLS), currently under design, requires accurate alignment between the electron beam and the undulator 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' location 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.