characterization and testing of 2m x 2m glass resistive plate chamber mohammed salim m aligarh...
TRANSCRIPT
Characterization And Testing Of
2m X 2mGlass Resistive Plate Chamber
Mohammed Salim M
Aligarh Muslim University
Topics
Introduction Principles of Operation Gas Mixture Fabrication Testing Trigger Results
Introduction
INO (India based Neutrino Experiment) is India’s biggest experiment to study the properties of weakly interacting, electrically neutral fundamental particle, neutrinos
Underground experiment will study the properties of ‘Atmospheric Neutrinos’.
Resistive Plate Chambers (RPC) are the active detectors used in the proposed INOICAL (Iron Calorimeter)
Introduction (contd..)
Introduction (contd..)
Two 3mm thick float glassesSeparated by 2mm spacers
2mm thick spacer
Glass plates
Graphite coating on the outer surfaces of glasses
Pickup strips
Various layers of RPC
Principle of operation
3
Two modes of operation
o Avalanche mode
o Streamer mode
l
A
A
lRC
s 2)10 x (8.85 x 4 x )10 x ( -1210
Gas mixture
The gas mixture fixes the working mode of RPC
Three gases are used in avalanche mode
R134A( as Freon) 95.4% Isobutane 4.3% SF6 0.3%
Avalanche and Streamer pulses Taken from CRO
Fabrication
1. Glass cutting and cleaning2. Conductive coating3. Gas leak test4. Connecting High Voltage Cables5. Placing pick up panels6. Connecting Pre Amplifier boards
Surface resistance measurement
1 div~33cm
Uniform surface resistance of 1 MΩ is expected.
VI Characteristics
Trigger
• Scintillator paddles are used for triggering the RPC pulse
Block diagram of lab set up
Results of 2m X 2m RPC
Efficiency Noise rate at various voltages
Fixed operating voltage at 9.6 kV
Effect of SF6
TDC and QDC plots
TDC plot of the main strip (strip no.32) ADC plot of the main strip
Calibration of the MFC
The gas is fluxed into the tube and then water is allowed to flow through the tube. The gas apply the pressure on the water and water bubble flows through the tube and we can determine the rate of flow by measuring the change in volume in some fixed time with the help of stop watch.
Water flow
Glass tube Gas flow
Scale
Calibration plots of MFC
Calibration plots of MFC
Snap shots from our work shop
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