Difference: AtfBpmProgram (5 vs. 6)

Revision 607 Jan 2009 - StewartBoogert

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META TOPICPARENT name="BeamPosition"

Cavity BPM systems work

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

Online measurements and tests

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

First pulse operation (still useful test for ILC)

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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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