[g2p_ana] Question BPM calibration

[Pengjia]

Hi Alex,
No we didn't (we did in auto gain mode, but they are useless). We did
several calibration runs on different beam current (50-100nA) on May.3, and
I used them to remove the current dependency (the constant b in my paper).
But seems the constant in this current range does not work well for runs
with curr<40nA for BPM B (A is much better),  We can try to use the runs to
fit again with stable yields and stable BPM A pos to fix the current
dependency for BPM B (if the we assume the real pos is stable if with
stable yields and stable BPM A pos), although I thought It is dangerous
since I need to use the updated b to fit other constants with the same
calibration runs, even if the current of the calibration runs is not in
that current range. I've updated the BPM B constants for 5T long
(5706-5812) for Jie, at least there is no current dependency for those
runs. If the results matched the simulated yields then we can try another
settings.

Pengjia

2016-04-27 22:34 GMT+08:00 Alexandre Camsonne <camsonne at jlab.org>:

> Hi Pengjia,
>
> did we take bull's eye scan at different current ?
> ( I thought we did at lower currents )
>
> I guess at low current we are more sensitive to pedestal value and noise.
>
> Alexandre
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