*Institute of Space Science TB2016 – pedestal analysis Veta Ghenescu* *Institute of Space Science 11/17/2016

Experimental set-up LumiCal LumiCal e- beam 2cm Tracker target 1st telescope arm magnet 2nd telescope arm L 2 L 1 R1 R2 Channels: 1 - 64 4 sectors: Tracker planes consist of LumiCal sensors without absorber layers; Lumical calorimeter consists of 6 Si sensors with one absorber layer placed in front of each active sensor layer; Questions: - Sectors R1 and R2 were connected to the Master chip - Sectors L1 and L2 were connected to the Slave chip LumiCal 1 . 62 63 127 126 . 65 64 W Tungsten absorbers Silicon sensors 2/29/2016

Without charge divider Data #Run Hit position ~ pad no Energy beam Observation Without charge divider 588 X = 87.5, y = -373.5 ~ Pad 18 5 GeV No target, no mag field 606 X = 47.3, y = -373.5 ~ Pad 49 636 Target =1.5mm Magnetic field, I = 90A 704 X = 47.3, y = -373.5 ~ Pad 49 Target = 1.5mm Magnetic field, I = 90A With charge divider* 741 X = 94.1, y = -348.1 ~ Pad 20 No target , no mag field 767 X = 94.1, y = -348.1 ~ Pad 20 Target = 1.5 mm 789 Target = 2.5 mm *The charge divider wasn’t installed on all APVs. The trackers were without charge divider all the time

Pedestal - #tracker 1

Pedestal - #tracker 2

Pedestal - #layer 1

Pedestal - #layer 2

Pedestal - #layer 3

Pedestal - #layer 4

Pedestal - #layer 5

Pedestal - #layer 6 - TAB

Conclusions the The pedestal was analysis for all APVs and for different experimental conditions as follow: w/ and w/o charger divider w and w/o magnetic field w/ and w/o target For trackers the pedestal is almost the same; For LumiCal layers w/o charge divider the pedestal decrease channel by channel, For LumiCal layers w/ charge divider the pedestal is almost constant for channels placed on the L1 and R2 sectors;