Transcript ppt

First Look at ACD data
We have MIP calibrations for all the pmts
(Only the TOP tile A-side PMTs are shown here)
Rest will be on the web soon (where should I put them?)
NO obvious efficiency holes
Gaps between tiles
(covered by ribbons)
Tiles overlap
(but track
extrapolation
is not perfect)
All events where TRACK points to TOP
tile with no HIT
RUN 135005097 (800k+ events)
Require exactly one track, no other cuts.
PMT by PMT efficiency (A Side)
T
This is a first loo
only, NOT a
measurement of
ACD performanc
Fraction of events with tracks pointing at tile, with hit in same ti
Require exactly one track. Only extrapolate track upwards.
No other track quality cuts.
Run 135005097 (800k+ events)
Lots of low energy hits
A few noisy channels
Low PHA hits are
often seen in BOTH
PMT on a single tile
Real energy deposit
in tile. Probably
associated particles in
muon shower
Fraction of hits w/ below VETO threshold
Immediate Future Plans
Taking 20 hours of cosmics this weekend
Measure PHA (Landau) curves for each PMT
Do tomography, see how light yield varies across tiles
Look at edge effects, study tracking resolution
Look at efficiency for various VETO cuts (relative to 1 MIP)
Look at spectra of hits NOT associated to tracks (noise?)
A few caveats
Zero suppression will not be ideal
Pedestals have changed (up to 40 counts in some channels)
Observed a few noisy channels because of this
Processing will not be MIP calibrated, only RAW pha
Hopefully later reprocessing will be calibrated
Calibration exists, but need tools to use it in gaudi