Transcript Resistive Plate Chamber - Tata Institute of Fundamental

Development of Resistive Plate Chamber
for charge particle detection
Suryanarayan Dash
Under the guidance of Prof N K Mondal
TIFR,Mumbai
Objectives:
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Introduction
Main feature of RPC
RPC Fabrication
RPC Theory & Operation
Laboratory test set-up
Analysis of results
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
Main feature
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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
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.
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Finished RPC Frame
After graphite coating the
surface resistivity 200400 kΏ/
Equivalent circuit of glass RPC
RPC principles of operation
μ
Pulse height ~100 mV
Laboratory test set-up with basic circuit
Efficiency of RPC
Typical TDC distribution
Time resolution
Typical ADC distribution
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
Thanks a lot .