1. Development of Resistive Plate Chamber for charge particle detection
Suryanarayan Dash
Under the guidance of Prof N K Mondal
TIFR,Mumbai

2. Objectives: Introduction Main feature of RPC RPC Fabrication
RPC Theory & Operation
Laboratory test set-up
Analysis of results

3. Introduction Detectors:Searching for new particles
To study their interaction
RPC the Resistive Plate Chamber detector was introduced in 1981
Works on the principles of ionization of gas molecules to detect tracks of charge particles

4. Main feature Very large pulse height Reduced cost per unit area
Easy fabrication and operation
Simple readout electronics
Good timing capability ,resolution is of the order of few ns

5. Components of glass RPC :
Pair of float glass with resistivity 1012 Ω cm with 2 mm thick
2 mm spacers
Gas mixture (typically Ar 30%,Freon 62%,isobutane 8%)
Ar: low cost,high specific ionization
Freon:high electron affinity
Isobutane:quencher
Gas nozzles
Graphite coating (good glass adhesion) for HV supply.

6. After graphite coating the surface resistivity 200-400 kΏ/  
After graphite coating the surface resistivity kΏ/
Finished RPC Frame

7. Equivalent circuit of glass RPC

9. RPC principles of operationμ
Pulse height ~100 mV

10. Laboratory test set-up with basic circuit

11. Efficiency of RPC

12. Typical TDC distribution

13. Time resolution

14. Typical ADC distribution

15. Summary:
The time resolution of the present RPC ~1.8 ns at 9 kV
The efficiency of our present detector: 90% at 9 kV
Wide acceptance in HEP and Astroparticle community

16. Thanks a lot .