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Cavity BPM systems work

Aim to provide long term stable BPM system operating at the best possible resolution.

  • Hardware measurements (related to BPM design, systematics etc)
  • Operations (beam based measurements)
  • First pulse operation

Hardware measurements

  1. Electronics gain (weekend measurement)
  2. Calibration tone (continuous measurement)
  3. Electronics noise figure (best possible resolution)
  4. Cavity coupling factor (x-y cross coupling)

Online measurements and tests

  1. Individual BPM calibrations (mover)
  2. Orbit bump calibrations (non-mover BPMs)
  3. Dynamic range, coupling strength (requires electronics gain), linearity
  4. Cross coupling (x-y)
  5. Resolution (simple, jitter removed)
  6. Tone calibration system (constantly updated gain measurements)
  7. Temperature monitoring system
  8. Long term position drift measurements
  9. Multi-bunch operation
  10. Use in "slow" feedback operation
  11. Electrical centre drifts/stability

First pulse operation (still useful test for ILC)

This is still useful as in a large system (ILC, FEL) the BPMs cannot all be calibrated using a mover system. This would be the first test towards an ab-initio system, combined with careful gain/loss measurements would represent a test of the techniques that would have to be used at the ILC.

  1. Measure precisely phase of each signal cable
  2. Local oscillator phase
  3. Phase difference for each BPM due to beam propagation

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Topic revision: r6 - 07 Jan 2009 - StewartBoogert

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