These are the results of a global linear fit for beam cavity monitors 1 and 2. The fit is "global" in the sense that data from all three BCM calibration runs are used. Each datum was derived using local zeroes.

The figure shows the residuals of the calibrated beam cavity monitor output versus current. One can quickly see that the BCM2 residuals looks great. There is no evidence of nonlinearity (within the errors!) between 10-110 microA. This is what we're going to use for charge determination in FpiII.
The best fit to BCM1 would require at least two different gains. This is no surprise since we know its gain shifted 3% in the middle of the run. I will provide the time dependent calibrations for BCM1 to provide some cross-check in the analysis.

Here the BCM residuals are plotted versus sample number. The long breaks between the various calibration runs are demarcated by green vertical lines. The BCM2 calibration is consistent with a constant calibration hypothesis at the level of +-200 nA. However, BCM1 looks particularly confusing when plotted this way!

These are the hclog links from the FpiII run relevent to the BCM's. Any calibrations found here are superseded by the above global analysis:

Unser wire calibration data
Unser wire calibration results
BCM calibration data run 47053
Initial FpiII BCM calibration
Updated FpiII BCM Calibrations (local zero analysis)
BCM1 gain is shifting
Summary of BCM1 work
BCM calibration data run 47522
Updated BCM1 calibration from run 47522
Final BCM calibration data run 47739

Sept 5, 2003, by Dave Mack