1. SLAC fDIRC data processing for Hawai’i electronics (SLAC experiment T-492 ) Larry Ruckman & Gary Varner Instrumentation Development Laboratory (ID-Lab) University of Hawaii at Manoa October 4, 2007

2. First data skimming Converts from raw ADC counts to voltage Keep any event with 1 or more of the 12 waveforms with hits below -40 mV Perform a FFT filter to the same response as front end electronics low-pass filtering Maintain the event number with the corresponding skimmed data event Skip over and does not write to file the events with no photodetector signals After processing, raw data files get tar.gz and stored onto DVDs

5. -40 mV Cutoff Skimmed EventsDiscarded events

6. Summary Done transferring all raw data from SLAC to UHM Processed 1219 of 1619 1/2 GB raw data files 69 raw data storage DVDs have been made (150k raw events per DVD) Over 1.4 million skimmed events obtain from 12.2 million processed raw data events Need to organize files with respect to beam position Next, apply pulse fitting algorithm and charge algorithm to obtain a time and charge for each skimmed event