Photon Beam Position Stability

Mike Grissom

UNCW

July 29,2005

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

Process

1. Extract all arrays from all skim files

2. Make histograms of the x and y distributions

3. Gaussian fit

4. Log EPICS event number, means, sigmas, and integral of number of events in a data file

Data Storage

Book keeping DB: means, sigmas, and integral of number of events for each EPICS event (x and y)

Calibration DB: average means and sigmas for each run (x and y)

Note: First ~200 and last ~100 runs (calibration snake runs) show bad position data

Summary

Created histograms using EPICS skim files

Fit all distributions

Put means, sigmas, integral for all events in book_keeping DB

Put ave. means and sigmas for all runs in Cal DB

Future

Use survey data to find absolute position of photon beam

Analyze electron beam stability

(position and current)

Thanks

Liping Gan

Ashot Gasparian

Dustin McNutly

Mike Wood

Mark Ito

Vasily Mochalov

2005-07-29T10:32:23