Highlights from RICH2007. PPD Seminar. S.Easo, A.Papanestis, S.Ricciardi. Contribution from S.Easo. 28-11-2007. Outline. RICH detectors in accelerator based experiments:. Review of Advantages and Limitations of RICH for PID. R&D for new RICH systems.
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S.Easo, A.Papanestis, S.Ricciardi
Contribution from S.Easo
1934-44 P.Cherenkov + Frank + Tamm
1960 Arthur Roberts : First Proposal for RICH
1976 T. Ypsilantis + J. Seguinot :
Pioneering the construction of the first RICH
For momenta well above threshold
p/K separation-limiting case
n=1.474 (Fused Silica)
n=1.27 (C6F14 CRID)
n=1.02 (Typical Silica Aerogel)
n=1.001665 (C5F12/N2 CRID Mix)
and maximize the Positive ID efficiency.
in other parts of the detector etc.
Discussion: Why RICH is not used in General Purpose Detectors at LHC, ILC:
Large Momenta Low Refractive Index Gas Radiators of Length 1 to 2 meters.
Increase the size and hence cost, of calorimeter & muon detectors, downstream of a RICH
RICH covers the large Momentum range 1-100 GeV/c : using three radiators: Aerogel, C4F10 and CF4.
encapsulated in the vacuum tube.
HPDs in RICH2
Single Photon Cherenkov Angle Resolutions in mrad.
LHCb RICH PID Performance
After using RICH, background at 10% level from 10 times level
Burle 85011 MCP-PMT( sTTS = 50-70 ps),
3 X 12 mm Hamamatsu H9500 Flat panel PMT ( s TTS =220ps).
Npe = 28 for 1.7 cm quartz
4cm thick aerogel
2 layers of 2cm thick
p/K separation with focusing configuration ~ 4.8s @4GeV/c
producing Cherenkov photons from
a cosmic ray setup and Hamamatsu SiPM
LiF radiator with 20 m 2 of CH4+TEA in MWPC.
GEM detectors : 0.31.6 ns readout time.
focusing on a plane at ROC/2.
Result of ALICE upgrade simulation
Gas based Detectors
D0 K - p +