First Tests of FEB Universit de Genve B

First Tests of FEB Université de Genève B. Martinez April 2016

The New FEB - Developped by UNIGE Delivered a few weeks ago Allow faster acquisition Simple Calibration Tests done A few Cosmic acquisition done Preparing the set up for LED test

Set Up : the new FEB Power supply : 24. 1 V FPGA 12 over 96 channels connected 3 CITIROC USB 3. 0

Set Up : CITIROC Block Scheme

FEB First Calibration Dark Counts for 1 Ch Calibration 1. 36 e 6 entries in less than 10 sec The old FEB needed ~10 min to acquire 5000 entries Peaks localisation Up Graph : derivative Middle Graph : actual fit Down Graph : multi Gaussian

FEB First Calibration 2 nd method Substract background /! linear scale /! Dark Counts for 1 Ch Calibration Determination of the background And then we locate the peaks as before…

Set Up : CITIROC playground CITIROC Block Scheme

FEB Scan of different parameters : input DAC Scan form 68 to 187 Input DAC - Below 68 and over 187 it’s difficult to identify the peaks - The range is getting worse as we get far from 120 -135 - Because of the «crushing» due to the bckgd substraction we have less statistics for these values - There is a problem with the first peak. /! Not Error bars but RANGE /!

FEB First Calibration : First Peak problem One can see that the rising of the First peak is more brutal than the rising of the others. It’s probably due to the trigger we put. We tried to discard the First peak from our results.

FEB Scan of different parameters : input DAC Scan form 68 to 187 Input DAC w/o First Peak - The range is much better - It’s difficult to use this method with the substracted background because of the low statistics. - Doesn’t affect so much the values around 120. Only for simple method

FEB Scan of different parameters : HG Scan from 30 to 63 (MAX) - Below 30 to identify the peaks - The signal seems to saturate when we approach the maximum - For now we only use the simple method for the HG. - We have still to identify if the first peak is a problem too. /! Not Error bars but RANGE /!

LED Set Up : vertical Scintillators Through the wall into darkroom FEB LED driver (Sofia University)

LED Set Up : vertical Scintillators

First Tests with LED PW 600 ns For now we just run a few tests to see if the LED system was working. We still have to play with it. LED will be use to discard the «bad» scintillators bars PW 800 ns

Conclusion & Remarks - We have to analyze our first cosmics data - We seem to have discover the best area (Input DAC ~120, HG~55) - We have to proceed at some LED tests quickly - We have to write a script to automatize the data acquisition - There is still a few bug in the program (Start & File Size (SOLVED!))