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User name Armstrong
Log entry time 12:32:27 on November25,2009
Entry number 302517
keyword=Dithering plots: anemic...Dithering plots are below, from Panguin.
The energy modulation signal in BPM12x is nice and clear, and it does not lead to much position response in BPM4A and BPM4B - none in vertical, only modest in horizontal, so this seems fine.
However, the response to the other coils in BPM4A and BPM4B seems rather weak (anemic, actually) and I see little or no phase advance.
This is the first time I have looked at this for the present experiment - maybe it is adequate, given the modest requirements on helicity-correlated beam parameters for this experiment. Also, given the very high priority to get an adequate tune for the Compton, the (possibly rather orthogonal) tune requirements for good phase advance seem to be a low priority.
Perhaps Kent, Rupesh, or other experts can take a look.
FIGURE 1
