Quick Overview of TkrTotalHits Data for Light Test

Xenon lamp illuminated grid perimeter and +Y and –X faces of ACD. Lamp scanned manually across LAT for half of 10 min run. Light files Dark file

Simple Test Looked at TkrTotalHits range of 5-15 hits for a LAT half Light and dark files were normalized to cover the same amount of time. Excluded Tower 15 which showed a large flare, unrelated to the light test Subtracted the dark file from a single light file. Fit a constant to the data. If zero fell within 1.5 standard deviations of the fitted constant, that half of the LAT passed this light test. All light files passed.

Light Dark TkrTotal Hits -X half of LAT Light file: Dark file: const = Std= 1.82