The Poor Man

1
The Poor Mans RICH Concept A One-Dimensional
Dual Radiator RICH

• Joerg Reinhold
• Florida International University, Miami
• presented at
• Hall C Summer Workshop
• August 7, 2009

2
A poorly funded pet projectin collaboration
with

• Michael Carl, FIU M.S. 2003
• M. Carl, J. Reinhold, et. al., NIM A527
  (2004) 301.
• Brian Beckford, FIU M.S. 2008
• Naipy Perez, FIU M.S. 2006
• Tohoku University

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Cherenkov Radiation TriviaPrediction 1889?
Noble Prize in Physics 1958
Oliver Heaviside
Pavel Alekseyevich Cherenkov
Ilja Mikhailovich Frank
Igor Yevgenyevich Tamm
See e.g. O. Heaviside, Electromagnetic
Theory (Chelsea Publishing Company, New York,
1971)
Cerenkov, C. R. Ac. Sci. U.S.S.R. 8, 451
(1934) Frank and Tamm, C. R. Ac. Sci. U.S.S.R.
14, 109 (1937)
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Motivation Jefferson Lab at 12 GeVPID with
Cherenkov detectors
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Ring Imaging Cherenkov Detector (RICH)
Image from P.A. Cerenkov, Radiation of Particles
Moving at a velocity exceeding that of light, and
some of the possibilities for their use in
Experimental Physics. Nobel Lecture (1958).
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Ring Imaging Cherenkov Detector (RICH)
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Ring Imaging Cherenkov Detector (RICH)
Example 1m x 1m area 1cm2 pads gt 10,000
channels 1cm stripes w/2-sided readout gt 200
channels
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Nuclear Instruments and Methods in Physics
Research A333 (1993) 458-463North-HollandA RICH
detector for velocity determination of heavy
ionsK. Zeitelhack, J. Friese, HA. Körner, J.
Reinhold and R. SchneiderPhysik-Department E12,
TU Munchen, Germany
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Poor Mans RICH Concept
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Wavelength Shifter PropertiesCharles Hurlbut,
ELJEN Technology, Sweetwater TX,
www.eljentechnology.com, private communication
Waveshifting quantum efficiency 84.
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KEK PS Experiment T554

• 30 cm x 10 cm x 1 cm WLS
• 2 5-inch PMTs (Photonis)
• 8-mm fused silica radiator
• Hadron beam line with p, K, ? up to 2 GeV/c
• Scintillator TOF for PID

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T554 Results
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T554 Results
w/out reflection losses at radiator/air air/WLS
boundaries
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T554 Results Discussion

• Digitized Q.E.s transm.
• Fold with Cherenkov spectrum
• Expect ?coll65
• Agrees with external collection
• However internal 41??
• Need to study theory of
• Cherenkov in absorbing media

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Monte Carlo Simulation

• 10 cm n1.015 aerogel radiator
• 100 cm distance aerogel-WLS
• 50 WLS bars, 1 cm wide
• ?coll61.5

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MC Disributions Likelihood PID
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PID Efficiencies 10 cm n1.015
protons
kaons
pions
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Distributions at p12 GeV10 cm n1.015 aerogel
radiator
?
?
K
K
p
p
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Dual Radiator10 cm n1.015 100 cm C4F10
proton
kaon
pion
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Comparison with other RICH
14 N. Akopov et al. The HERMES dual-radiator
ring imaging Cherenkov detector. Nuc. Inst. Meth.
Phys. Res. 479 (2002) 511-530. 37 P. Di Nezza,
Hadron Suppression in DIS at HERMES. J.Phys.G
Nucl.Part.Phys.30(2004)S783-S790. 38
K.Suetsugu, Performance of Pion and proton
identication with Ring Imaging Cerenkov Counter
of HERMES. Master's thesis, Tokyo (February
2001). DESYTHESIS-2001-016. 40 A. Papanestis,
The Ring Imaging Cherenkov Detectors for LHCb.
International Europhysics Conference on High
Energy Physics, PoS(HEP2005)375. 41 E. Nappi,
Particle Identication Techniques. PhD
Dissertation, 2005.
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Summary Outlook

• WLS collection efficiency 62
• 1-dim RICH w/PID comparable to existing RICH
• WLS are low-cost options for large area segmented
  photon collectors
• Need more realistic MC angular distributions,
  Rayleigh scattering,
• Measure ?coll for thin long WLS