This document summarizes a study analyzing the shower profile of 1-5 GeV electron beams passing through multiple layers of silicon detectors with ASIC readout. Key findings include: (1) The size of electron showers increased with increasing radiation length as expected; (2) The beam may not have been properly aligned or showers may have leaked between configurations, as seen by a discrepancy between end of 1X0 and start of 3X0; and (3) Simulation is needed to verify the shower profile results and potential beam misalignment issues.

1. Shower study for 1-5 GeV energy electron
beam with ASICSKIROC readout
Elmaddin Guliyev
LLR – Ecole Polytechnique, CNRS/IN2P3
Palaiseau, France
26.09.2012- Analysis meeting

2. Tungsten plate
Detector Interface (DIF)
to DAQ (LDA)
am
be
e-
Very front-electronics (FVE8)
ASIC+Si wafer
e- beam energy: 1-5 GeV
Rate: 1 KHz – 5 Hz
6 layer of detector=6*(Si wafer+4ASIC+DIF)

3. 1 GeV e- hit with 6 layer of detector: between the layers
and in front of 1st layer W plate placed.
All the run was same: 3600 sec.

4. Example of MIP for one chip, channel,column
Pedestal
1st MIP
2nd MIP

5. MIP position variety:

6. MIP position variety:

7. Shower profile for 6 layer/detector for 1 GeV electron / X0

8. Beam alignment or leakage in configuration????

9. Hit per event for different radiation length

10. X profile GAUS fit
Use to estimate:
Shower size-sigma from gaus
Beam alignment-mean from gaus

11. Mean value of Gaus fit of shower on X profile
Deviation ==> beam alignment

12. Shower size for different radiation length:
Size of shower determined from sigma of Gaus fit of shower profile.
Shower size (sigma gaus)

13. Shower study in radial direction for different radiation length.
e-

14. Efficiency for the layers (detectors)
1 GeV electron beam
X0 and 6X0 configuration

15. Hit for one event in same BCID

16. Summary:
Hit distribution for different radiation length analysed.
The size of shower estimated for different radiation length.
It seems beam not aligned proper or we had a shower leakage
due to particle loose, which gives the discrepancy in end of X0 and beginning of
3X0 configuration (same for 3X0 and 6X0).
Need to verify it with same geometry with simulation!

17. Hold calibration
Optimized value: 100-110 uDelay