Beam-Test@CERN I.Laktineh IPNL/IN2P3/UCBL. I.Laktineh-IPNL2 Aims Test a mini DHCAL with new...
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Transcript of Beam-Test@CERN I.Laktineh IPNL/IN2P3/UCBL. I.Laktineh-IPNL2 Aims Test a mini DHCAL with new...
Beam-Test@CERN
I.LaktinehIPNL/IN2P3/UCBL
I.Laktineh-IPNL 2
Aims
• Test a mini DHCAL with new generation embedded electronics readout in beam conditions for the first time
• Use the high precision provided by EuDet telescope to study the inefficiency of GRPC
due to inter-pads and edge effects.
I.Laktineh-IPNL 3
Interpad: 500µ
HV
Signal
Graphite
Resistive platesGas
Pick-up pads
GRPC
I.Laktineh-IPNL 4
Test @ps-T10
Eudet Telescope
Mini DHCAL
I.Laktineh-IPNL 5
Test @ps-T10
Photogrammetry measurement
I.Laktineh-IPNL 6
EuDet Telescope photogrammetric spots
used for alignment
Moveable table
Test @ps-T10
I.Laktineh-IPNL 7
Spots positioning on both EuDet telescope and DHCAL Setup
I.Laktineh-IPNL 8
Beam position
Detector primary position
Detector next position3500 µ shift
(half of the sensor width)
.
.
.3 cm shift
For each position : 2000-3000 triggers
GRPC
GRPC
GRPC
The touched pads in the 4 GRPC for successive positions
Second threshold
First threshold
32X8 pads
I.Laktineh-IPNL 10
Clusters and tracks reconstruction in mini DHCAL
Clustering :touched pads were gathered into clusters if relative distanceis less than 2cm.Pads having only one threshold: weight = 1Pads having two thresholds : weight = 2
Tracking :Clusters belonging to different detectorswere gathered into tracks if compatible with straight line
A simple reconstruction algorithm was used to study the GRPC detectors
I.Laktineh-IPNL 11
Inefficiency Study using EuDet Telescope
• The available beam at T10 is made of 1-6 GeV pions. 6 GeV pions were used for this study
• SciPM+TLU system was used as trigger for both EuDet telescope and the DHCAL so events in both detectors were associated.
• Due to multiple scattering in the 4 GRPC’s of the mini DHCAL (even with no absorber) only the first arm (3 sensors) was used to reconstruct tracks
• Using the alignment result from the photogrammetry measurement, tracks reconstructed in the first arm were projected to the GRPC’s. The clusters associated to those tracks are recorded.
• The efficiency of tracks reconstruction in Eudet is between 50 and 60%.
I.Laktineh-IPNL 12
expected position%seen for found clusters GRPC clusters position
Position expected from EuTelInter-pads position
preliminary
micron
Arb
itra
ry u
nit
Edge
I.Laktineh-IPNL 13
preliminary
Black: expected clusters from EuTelRed : Seen in GRPC
No clear evidence of the Inter-pads effect
Interpad position
micron
Edge position
Important edge effect?
?
I.Laktineh-IPNL 14
Black : Tracks associated to clusters with (1or2)threshold padsRed : Tracks associated to clusters with 2-threshold pads
preliminary
micron
I.Laktineh-IPNL 15
Conclusion• The beam test realized using EuDet telescope was
very fruitful• Preliminary results show an edge effect but this
should be more investigated• No inter-pad effect in the GRPC (within the
available statistics). New version of GRPC with improved frame should reduce this effect.
• Apply the same study to the other three GRPC detectors.