CID Cherenkov Imaging Detectors

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CID Cherenkov Imaging Detectors

• RICH software at HERMES, Ralf Kaiser, Glasgow
• Present status of DIRC, C.S., GSI
• Spiralling electrons, Klaus Föhl, Edinburgh
• ...

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Present status of DIRC

• GSI Design proposal
• Working principle (BaBar)
• TOP (Belle)
• Photondetectors
• TR

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GSI Design Proposal (CID)
PANDA Spokesperson Jim Ritman, Deputy Guenther
Rosner
2.280 TEuro
PANDA1 (CID) Leading Part. GSI, Task
Coordinator C.S.
430 TEuro
RICH Glasgow Guenther Rosner 163
TE Edinburgh Klaus Foehl 20 TE
DIRC Darmstadt C.S.
173 TE Mainz Josef Pochodzalla 49
TE Vienna Johann Marton 25 TE
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Ring Imaging Cherenkov Detectors RICH
PID tracking p, RICH b
m
CID Cherenkov Imaging Detectors
DIRC Detecting Internally Reflected Cherenkov
light
RICH focus or proximity focusing
pin point focus (camera obscura)
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Charged particle identification with DIRC
How to perform PID within a magnetic field in
front of an EMC as compact as possible (material,
costs)
B
target
DIRC
For pGeV SiO2 (n1.47)
Aerogel, C6F14 (n1.02, 1.24)
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DIRC
10000 PMTs !
Detecting Internally Reflected C-light (exsting
at BaBar)
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DIRC
degree
degree
degree
degree
degree
degree
degree
degree
?2/n2.4 pion b0.9745 47 photons
K eff.
K eff.
? miss-id.
? miss-id.
reaction pp --gt????at ?s 3.6 GeV/c2
reaction pp --gt????at ?s 3.6 GeV/c2
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Mechanical radiator quality
Edge losses
Sharpness of edges should be ? 50 ?m
Needs special care for handling
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DIRC-TOP Time Of Propagation
T1
T2
(discussed at Belle)
?reduced of PMT for Kaon PID ?very good
time resolution required ( 100 ps)
?T ,
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Mechanical support
quartz slabs embedded in honeycomb structure
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Photon detector test
ALADIN magnet
MCP-PM Burle Planacon 85001-501
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Micro Channel Plate PM Planacon 85001-501, Burle
Photocathode
glass tube
MCP
pixelized photoanode
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Micro Channel Plate PM Planacon 85001-501, Burle
light LED
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Photon detector candidate PMT-MCP
Photocathode
glass tube
MCP
pixelized photoanode
works up to 2.2 Tesla amplification up to
107 fast 0.1 ns
Anashin et al. NIMA 504 (2003) 276
pores 9 ?m
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DIRC Topics for Technical Report

• Geometry of slabs
• 17 x 30
• 10 x 30
• 5 x 30 mm2
• 10 x 120
• 10 x 240 mm2

• Cherenkov angle resolution ??C
• tracking (photon det.)
• dispersion (ph??)
• transport

BABAR
TOP
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RICH topics for Technical Report

• Thickness of radiator(s)
• ph vs. Rayleigh scattering
• Refractive index
• Cherenkov angle resolution ??C