Cavity BPM systems work

• 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

Online measurements and tests

1. Individual BPM calibrations
2. Dynamic range, coupling strength (requires electronics gain), linearity
3. Cross coupling (x-y)
4. Resolution (simple, jitter removed)
5. Tone calibration system
6. Temperature monitoring system

First pulse operation (still useful test for ILC)

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