resistive plate chamber
TRANSCRIPT
Development of Resistive Plate Chamber for charge particle detection
Suryanarayan DashUnder the guidance of Prof N K Mondal
TIFR,Mumbai
Objectives:
• 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
• 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.
After graphite coating the surface resistivity 200-400 kΏ/Finished RPC Frame
Equivalent circuit of glass RPC
RPC principles of operation
Pulse height ~100 mV
μ
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 .