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FoCal
Status of Silicon Pad detector Array: Design and Tests
1.Review of results from last test beam2.Plan for the test beam for 2015
11 March 2015
Test and Characterization of a Prototype Test and Characterization of a Prototype Silicon-Tungsten Electromagnetic CalorimeterSilicon-Tungsten Electromagnetic Calorimeter
VECC, Kolkata :: Sanjib Muhuri, Shuaib Ahmed Khan, Tapan K. Nayak, Rama Narayana Singaraju, Satyajit Jena
BARC, Mumbai :: Sourav Mukhopadhay, Vinay B. Chandratre, Maneka Sukhwani
and BEL, Bangalore
Published in
“Nuclear Instruments and Methods in Physics Research A 764(2014)24–29.
Silicon Pad 5x5 Arrays Each pad: 1cm2
Laboratory set up:
Layout of a 5*5 array of 1cm*1cm Silicon Detector
28 October 2014 Sanjib Muhuri, IWAD 2014, VECC 3
Laboratory set up and results
28 October 2014 Sanjib Muhuri, IWAD 2014, VECC 4
PMT1
PMT 2
Source- Sr90
Very thin scintillator to get 2 fold triggers
Arrangement for the laboratory experiment
Development of the mini prototype
Test Beam set up:
Arrangement at T10
28 October 2014 Sanjib Muhuri, IWAD 2014, VECC 5
Results From Test Beam Experiment:
28 October 2014 Sanjib Muhuri, IWAD 2014, VECC 6
Responses from am minimum ionizing particle
Responses from electron
ADC ADC
28 October 2014 Sanjib Muhuri, IWAD 2014, VECC 7
Actual Signal pions & electrons
4 GeV
pions
electrons
Satisfactory Signal to noise separation
28 October 2014 Sanjib Muhuri, IWAD 2014, VECC 8
Longitudinal Shower Profile Reconstruction
28 October 2014 Sanjib Muhuri, IWAD 2014, VECC 9
To check The Linearity of the detector…
28 October 2014 Sanjib Muhuri, IWAD 2014, VECC 10
Shows good linear behavior with respect to the simulation
36 element Silicon Pad detector
1 sq cm silicon pads in 6×6 array.320 microns. common n. Bias applied negative to p type pads. Signals from p type pads through capacitors.
Bonding diagram for pads .
Detector assembled on the PCB
Bias resistors and coupling capacitors
40 pin connector for signals
Wire bonds from padsGuard ring position one corner
Before wrapping in a black sheet and Al foil
Guard rings left floating
PMT1
PMT2
Detector
FEE Board
Translator Board
Testing
2 fold from PMTs is trigger to DAQ.Same backplane PCB made for 25 elements.MANAS/ANUSANSKAR readout.
31 1 X
15
23
20
?
29
5
11
X
X28
0
18
2625
X
7
?
22 21
27 30
19
24
17
16
14
13
12 10
9
8
4
?
Numbers inside the squares are DAQ channels. 4 channels left out(marked as X), since we can only read 32. 3 channels bad on FEE board. Fig needs minor corrections .
Test Setup Mapping of Pads to DAQ Channels for one position
Backplane PCB
RMS study with Bias 4 detector pcbs can be connected to one backplane PCB. Read by 2 FEE boards. 2 detector PCBs are read by one FEE(64 channels). Connected only detector PCB to backplane PCB. So only 32 channels (0 to 31) show higher RMS compared to other 32(32 to 63) RMs is high at bias 0v and decreases with increasing bias voltage. Stabilizes >45V. Few times rms has gone bad for some channels. Mean adc values have gone down to zero. See next 2 slides
@0V@30V @45V
@60V @70V @80V
@0V @30V
@45V@60V
On 21.08.13
Pedestal Study-1
Mean ADC values for some channels have gone down- channels above colored circles. Suspect humidity- The silicon gels have gone pale.
@0V @30V
@45V@65V
0n22.0813
Pedestal Study-2
Mean ADC values for all channels have normal values. None close to zero Kept the detector inside desiccators with new silicon gels over night. Humidity in the lab also more due to rains..
First signals
Status and plans for the test beam (PS and SPS)
• A new PCB for Silicon pad detectors is being made• Pad detectors to be mounted on the PCB• Prepare the readout with MANAS and ANU chips• Prepare the tower
• Present tower design is 4 Si-pad detectors in each plane• Tests can be done with single Si-pad detector in each
plane or with 4 Si-pad detectors in each plane• We have 25 tungsten plates (10 cm x 10 cm)• We can organize properly to gain maximum information
during the tests
• Provision for inserting MAPS detector in between ….
Arrangement for the Test Beam – Oct 2015
4 Pad detectors: each 6x6 arrayEach pad: 1cm x 1cm
4 tungsten plates: each 10cm x 10 cm