1. Photon Beam Position Stability Mike Grissom UNCW July 29,2005

2. Task Analyze PrimEx Gamma Profiler (PGP) EPICS data to study photon beam position stability during the fall 2004 data run EPICS Data consists of two 64- dimensional arrays, one in x and one in y

3. Process 1. Extract the two arrays from every skim file 2. Make histograms of the x and y distributions 3. Gaussian + Polynomial fit 4. Log means, sigmas, and EPICS event number in a data file

8. Data Storage Book keeping DB: means, sigmas for each EPICS event Calibration DB: average means and sigmas for each run Note: First ~200 and last ~100 runs (calibration snake runs) show bad data

9. Summary Created histograms using EPICS skim files Fit all distributions Put means, sigmas for all events in book_keeping DB Put ave. means, ave. sigmas for all runs in Cal DB

10. Thanks Liping Gan Ashot Gasparian Justin McNulty Mike Wood Mark Ito Vasily Mochalov