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The python code for this pyana module resides in pyana_examples/src/xppt_delayscan.py. In this example, we do a point detector delay scan, where we get the time as scan points via a control PV, and where time rebinning based on phase cavity measurement is used to improve the time resolution. One IPIMB device (a.k.a. IPM3) is used for normalization (i0, I Zero) (parameter name ipimb_norm) and another IPIMB device (a.k.a. PIM3) channel 1 is used as the signal (parameter name ipimb_sig).
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- Fetching the ControlPV information:
ControlPV is available from the env object, and since it only changes at the beginning
of each calibration cycle, the begincalibcycle function is the appropriate place to get it:
none
The ControlConfig object may contain several pvControl and pvMonitor objects. In this case
there's only one, but make sure the name matches anyway: none
- Fetching the IPIMB and PhaseCavity information:
All the other information that we need, is available through the evt object, and
event member function is the place to get it:
none
Use "XppSb3Ipm-1|Ipimb-0" (a.k.a. IPM3) sum of all channels for normalization and filtering
none
Use "XppSb3Pim-1|Ipimb-0" (a.k.a. PIM3) channel 1 as signal
none
Get the phase cavity:
none
Compute delay time and fill histograms
none
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Image peak finding
Here are a collection of useful algorithms for image analysis: http://docs.scipy.org/doc/scipy/reference/ndimage.html
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