PowerPoint Presentation - Status of TOF analysis/tools

Frank L. H. Wolfs

Department of Physics and Astronomy, University of Rochester

How to get a good time-of-flight?

ĄMany corrections need to be applied to go from the raw TDC channel to a good time-of-flight:

where

ĄTOFraw = raw FB TDC value, converted to ns, based on FB time calibrations (TPhFBGainCalcMod). Calibrations carried out during the run (once per day), and corrections made during DV.

ĄToffset = offset correction required to account for the variations in cable delay (TPhTOFTimeDelayMatchingMod). Calibrations carried out using the DV trees for each run, and corrections made during processing of PhoHit files.

ĄTcollision = correction for jitter in the start of the TDC by using the collision time obtained from the T0 counters. Requires calibrated T0 data, and this correction is made during processing of PhoHit files.

ĄSlew = slewing correction. This correction is based on the know threshold and the measured PMT amplitude. Slew corrections are made during processing of PhoHit files.