1. Characterization And Testing Of 2m X 2m Glass Resistive Plate Chamber Mohammed Salim M Aligarh Muslim University

2. Topics  Introduction  Principles of Operation  Gas Mixture  Fabrication  Testing  Trigger  Results

3. 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)

4. 4 Introduction (contd..)

6. Various layers of RPC

7. Principle of operation 3 Two modes of operation o Avalanche mode o Streamer mode

8. 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%

9. Avalanche and Streamer pulses Taken from CRO

10. Fabrication 1. Glass cutting and cleaning 2. Conductive coating 3. Gas leak test 4. Connecting High Voltage Cables 5. Placing pick up panels 6. Connecting Pre Amplifier boards

11. Surface resistance measurement 1 div~33cm Uniform surface resistance of 1 MΩ is expected.

12. VI Characteristics

13. Trigger Scintillator paddles are used for triggering the RPC pulse

14. Block diagram of lab set up

15. Results of 2m X 2m RPC EfficiencyNoise rate at various voltages Fixed operating voltage at 9.6 kV

16. Effect of SF 6

17. TDC and QDC plots TDC plot of the main strip (strip no.32)ADC plot of the main strip

18. 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

19. Calibration plots of MFC

21. Snap shots from our work shop

22. THANK YOU