Download - RICH detector
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RICH detector
Simon Swordy - PEBS meeting Jan 2009, CERN
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Purpose: to provide mass resolution at high rigidity (>10GV)
RICH volume
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~1m
Spherical mirror
Position sensitive detector
~0.8m
Gas radiator
Gas RICH
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Reflective Light Cone
3 x 3 mm2 SiPM
5mm
Conceptual design of focal plane
Side view
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VERITAS light cones (~3cm diameter)
Injection molded 16ch unit
PEBS focal plane cones
These cones ~30% efficient normalized by area
~5,000-10,000 elements for RICH~3mm rms photon location~300-600 module units
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Mirror options
MAGIC telescope diamond cut metal mirrors
Carbon foam base mirrors
Also glass foam base cold slump mirrors,Can be made of astronomical quality
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Aerogel
Detector
Proximity focused Aerogel RICH
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Cerenkov quality factor N0
N=N0 x L(length) x sin2
N0 => integration over wavelength of detector QE, reflectivity, etc
Best RICHs get N0~120
With these cones we lose light -> x 0.3 (ouch!)
But SiPM QE is larger than typical PMT -> x 1.5
So possibly N0 for Z=1 ~60
But, for Z=2, N0 ~240 (~60 pe for gamma threshold of ~18)
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1.5TV, 5TV MDR(3mm res), N0=120, 60
5TV
1.5TV
Rigidity resolution (blue) and RICH gamma resolution (red)
N0=120
N0=60
Assume radiator gas C4F10 threshold ~18
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1.5TV, 5TV MDR(3mm res), N0=120, 60
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PEBS pbar mass resolution, MDR=5TV, N0=30, rms=3mm @ 80 ± 10 GeV
pbar
K- Pi/Mu-
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Separation He3/4 at 40±5 GeV/nN0 = 120, MDR=5TV, rms 3mm
He3
He4
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Next steps:
• Work with 3x3mm2 SiPMTs
• Develop light cone geometry
• Test manufacture cones, measure collection improvement
• Electronics options
+ 2010
• Mirror design
• Vessel design