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Experiments on EMMA Requiring Minimal or No Modifications. J. Scott Berg Brookhaven National Laboratory 18 March 2010. Outline of Existing Experiments. Find linear parameters vs. energy Adjust lattice to desired configuration Accelerate beam from 10 to 20 MeV Scan longitudinal phase space

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experiments on emma requiring minimal or no modifications

Experiments on EMMA Requiring Minimal or No Modifications

J. Scott Berg

Brookhaven National Laboratory

18 March 2010

outline of existing experiments
Outline of Existing Experiments
  • Find linear parameters vs. energy
  • Adjust lattice to desired configuration
  • Accelerate beam from 10 to 20 MeV
    • Scan longitudinal phase space
    • Scan longitudinal parameters (frequency/voltage)
  • Scan transverse phase space
    • Find variation in fixed-energy parameters
    • Study how acceleration changes with amplitude
outline of existing experiments1
Outline of Existing Experiments
  • Introduce errors, look at effects
  • Set up additional lattice configurations
    • Different tune range
      • Effects related to resonances
      • Look for variation in emittance growth and beam loss
      • Verify expected effects on longitudinal dynamics
    • Different location of time of flight minimum
      • Look at variation in longitudinal dynamics
      • Expect similar behavior in transverse: verify
single resonance crossing
Single Resonance Crossing
  • Acceleration over a limited range
    • Cross an individual resonance slowly
  • Use a low voltage, vary to change rate
  • Reduced range serpentine acceleration
    • Only works near ToF minimum
  • Oscillation around stable fixed point
  • Study fixed energy behavior near resonance
  • Diagnostic need: accurate emittance
measurement of momentum spread
Measurement of Momentum Spread
  • Chromaticity: beam signal decays
  • Signal shape depends on momentum distribution
  • Reconstruct distribution
  • Take this data anyhow
  • Compare to momentum distribution measured elsewhere
more discrete acceleration
More Discrete Acceleration
  • Machida: orbit distortion from fewer cavities
  • Turn some cavities off and reproduce
space charge beam loading
Space Charge/Beam Loading
  • Basic design is to look at single-particle dynamics
  • Could look at weak current-dependent effects
    • Beam loading: just push current up
      • See effect on acceleration, try to correct for it
    • Space charge: make beam small if possible
      • Measure incoherent tune spread
      • Look at effect on acceleration
diagnostics for experiments
Diagnostics for Experiments
  • We proposed many diagnostics, but
  • Couldn’t afford all of them
  • Identify diagnostics needs/desires for experiments
  • Helps us to
    • Justify request
    • Prioritize what to ask for/buy
final remarks
Final Remarks
  • Thanks to Shinji, Eberhard, Rob for suggestions
  • Hopefully I didn’t miss anyone
  • Continue making suggestions as you get ideas
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