Simulations to Assess RF Phase and Amplitude Sensitivities

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Simulations to Assess RF Phase and Amplitude
Sensitivities

• Mike Church, FNAL
• 1/17/06

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Method

• Basic question How are beam arrival time and
  beam energy affected by RF phase and amplitude
  stability?
• Using MAD8.23
• Started with Bunch Compressor and Linac lattice
  files on SLAC web site
• 150A, 150B, 300A, 300B options
• Was able to duplicate plots shown on BC web site
• Main Linac cavities are all phased at -5.1 deg
• Was able to duplicate files sent by PT last month
• So far, phase and amplitude errors have all been
  generated coherently
• ie., entire Bunch Compressor or Linac phase or
  amplitude fluctuates together
• This is equivalent to a global LLRF phase
  reference fluctuating or a global amplitude
  reference fluctuating
• I think this is the worst case

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Some Results
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Further Plans

• Calculate IP arrival time and energy sensitivity
  to
• BC klystron phases fluctuating independently
• BC cavity phases fluctuating independently
• Linac klystron phases fluctuating independently
• Linac cavity phases fluctuating independently