1. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 20031 Development of RPCs for INO B.Satyanarayana TIFR, Mumbai, INDIA bsn@tifr.res.in

2. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 20032 Principle of operation

3. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 20033 RPC test setup Telescope

4. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 20034 Cosmic muon trigger and timing

5. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 20035 NIM and CAMAC electronics

6. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 20036 Telescope rate monitoring

7. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 20037 Gas mixing unit

8. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 20038 Typical efficiency plot

9. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 20039 Studies with gas mixtures

10. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200310 Typical timing distribution plot

11. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200311 Typical time response plot

12. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200312 Typical time resolution plot

13. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200313 Typical charge distribution plots

14. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200314 Typical mean charge plot

15. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200315 Typical noise rate plot

16. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200316 Typical cross-talk plots

17. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200317 Summary of cross-talk measurements Gas MixtureSlit Size(mm)Cross talk(%) 62:8:30106.8 62:8:30156.7 62:8:30206.2 57:8:35206.5 52:8:40205.9 46:8:46206.3

18. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200318 Effects of wet gases

19. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200319 Recovering a damaged RPC Purging with pure Argon at high flow rate. Bubbling pure Argon through pure ethyl alcohol. Bubbling pure Argon through 25% Ammonia solution for 24 hours without electric field. Recovers efficiency and brings down noise rate. Detailed studies underway.

20. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200320 RPC recovery plots No of hours of gas flow

21. The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 200321 Future plans Study of effect of wet gases on RPC performance, aging etc. Study of pickup strip materials, geometries & pulse characteristics Long term studies with small chambers. Improvements in the gas mixing unit, Cosmic test setup, etc. Procurement of dry gases. Production of 120cm X 90cm RPCs for prototype detector