INO TRIDAS activities at Mumbai

1
Development of RPCs for INO
B.Satyanarayana TIFR, Mumbai, INDIA bsn_at_tifr.res.i
n
2
Principle of operation
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RPC test setup
Telescope
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Cosmic muon trigger and timing
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NIM and CAMAC electronics
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Telescope rate monitoring
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Gas mixing unit
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Typical efficiency plot
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Studies with gas mixtures
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Typical timing distribution plot
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Typical time response plot
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Typical time resolution plot
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Typical charge distribution plots
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Typical mean charge plot
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Typical noise rate plot
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Typical cross-talk plots
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Summary of cross-talk measurements
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Effects of wet gases
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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.

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RPC recovery plots
No of hours of gas flow
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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