Beam dithering for HAPPEX

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Beam dithering for HAPPEX
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Beam dithering

• Designed to correct for helicity correlations in
  beam parameters.
• Does not rely on beam noise like regression
  anlysis.
• Has proven to be a valuable diagnostic in
  previous experiments.

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Location of Coils and Monitors
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Response of Position Monitors
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Response of detector
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Stability of Dither Coefficients
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SU plans

• Make sure proper dithering hardware is installed
  in Hall C
• Write DAQ and analysis software needed for
  dithering
• Incorporate data from the 5MeV point into the
  data stream
• Handle beam width tests and DC lock
• Of beam parameters.