1. Summer 09 Testbeams SDHCAL prototypes
Kieffer Robert
IPNL
Lyon 16/09/09
2p3.fr
Hello,
I will pesent to you…

2. Introduction Efficiency and rates studies, with small
prototypes will permit us to find the best
solutions in order to build high performances
1m2 detectors.
A new proposition has been tested on beam
this summer:
Gaseous Resistive Plate Chamber using
semi-conductive glass.
First i will introduce…
Then i will speak about…
CALICE week September09

3. Beam Time First period: PS T9 18June to 8July Second period: SPS H4
Master setup: small chamber
Slave setup: 1m2 prototype
Gamma quencher: Co2/Isobutane
Second period:
SPS H4
31Jully to 7August
Master setup: 1m2 prototype
Slave setup: small chamber
Gamma quencher: CO2
1m2 Prototype
Small Chambers
First i will introduce…
Then i will speak about…
CALICE week September09

4. Efficency decrases a lot for hight rates!
Starting point
First rates studies using classical float glass detectors:
Resistivity: 1013 ohm.cm
Data taken at CERN last year (summer 08)
100 Hz/cm2
Efficency decrases a lot for hight rates!
CALICE week September09

5. The semi-conductive GRPC
Starting a colaboration with the Tsinghua
University, they provide us 1010ohm.cm
semi-conductive glass.
We build two small chambers to make some tests:
Glass size: 6x28cm2
Glass thickness: (0.83mm / 1.1mm )
Gas gap: 1.2mm
One chamber uses 1.1mm plates each side, being coated with licron.
Second chamber has a 0.83mm plate on the readout side, and 1.1mm plate on the cathode side, with a statguard coating.
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6. Efficiency vs HV using CO2
Reference Russian Chamber
Thin Semiconductive glass
Rate <100Hz/cm2
Thick
Semiconductive
Glass
Rate >10kHz/cm2
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7. Efficiency vs HV using Isobutane
Thick
Semiconductive
Glass
Thin Semiconductive glass
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8. Efficiency vs Threshold (CO2)
Threshold in daq units (1DAQ = 2fC)
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9. Multiplicity vs HV (CO2)
Thin Semiconductive
Thick
Semiconductive
Reference Chamber
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10. Conclusion & Outlook Semi-conductive glass shows good efficiency
even at hight rates (>10kHz)
The maximum available size is 30x30 cm2 for now.
We start a collaboration with the Tsinghua University,
and we are working on to get 1m2 semi-conductive
glass as soon as possible.
Then we could obtain a huge improvement
on the 1m3 prototype capabilities.
2010 Two thousand ten
CALICE week September09

11. Thanks for your attention.
CALICE week September09