Multianode Multianode Photo Multipliers for Photo Multipliers for Ring Imaging Cherenkov Ring Imaging Cherenkov Detectors Detectors Introduction Multianode Photo Multiplier Tubes R&D Results – Light Scanning Facilities – CERN Test Beam Conclusions Osaka 29.7. 2000 Franz Muheim University of Edinburgh
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Multianode Photo Multipliers for Ring Imaging Cherenkov Detectors
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MultianodeMultianodePhoto Multipliers for Photo Multipliers for
Ring Imaging Cherenkov Ring Imaging Cherenkov DetectorsDetectors
Yield of p.e. corrected for – common-mode,– cross-talk,– a few dead pixels,– background 0.26 p.e.
Observe in data6.51 0.34 p.e.
Expect from simulation 6.21 p.e.
Yield of different tubes
With quartz lenses
Photo Electron YieldsPhoto Electron Yields
059 1.09 0.66
1.00 0.00 1.13
0.60 0.83 0.61 Signal > 5 threshold
F. MuheimOsaka 29.7.2000
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Photon YieldsPhoton YieldsNo lenses Quartz lenses
Demonstrates lens effect yield ratio with/without lenses = 1.45
F. MuheimOsaka 29.7.2000
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Single MAPMT Test BeamSingle MAPMT Test Beam
Air radiatorLensPressure
Run 2059Yes
49 mbar
Run 2057No
49 mbar
Run 2042Yes
960 mbar
Run 2039No
960 mbarNumber ofdetectedphotoelectrons
DataSimulation
0.300.29
0.320.32
1.141.16
0.930.89
Good agreement
Photo electron yield CAMAC electronics RICH 1 prototype
F. MuheimOsaka 29.7.2000
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Charged ParticlesCharged Particles
Multiplicity from charged particles – [5..10] for for most
angles– up to 30 for angles
around 45o
small background
Charged particles traversing the lens & MAPMT produce background hits
F. MuheimOsaka 29.7.2000
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Magnetic Field TestsMagnetic Field Tests
LED Pin hole mask -metal shield (0.9mm)
MAPMT tested with Helmholtz coil B = 0, 10, 20, 30 Gauss
F. MuheimOsaka 29.7.2000
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Magnetic Field ResultsMagnetic Field Results
B Transverse– MAPMTs are insensitive
up to mag. fields of 30 G
– Expect mainly By 30 G
B longitudinal – Sensitive to Bz 10 G
gain loss, edge rows
– Expect Bz < 10 G
-metal: – Extension d
= 10,13, 32 mm– Reduces loss
no structure (d = 32 mm)
F. MuheimOsaka 29.7.2000
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ConclusionsConclusions
Successful test of 3x3 array of MaPMTs– Quartz lenses and close packing work – Measured photon yield as expected– Demonstrated 40 MHz read-out– MaPMT works in LHCb environment
MaPMT fulfills RICH requirements
MaPMT selected as LHCb backup photo detector due to high cost