Upload
osborne-shields
View
219
Download
3
Tags:
Embed Size (px)
Citation preview
The Poor Man’s RICH Concept: A One-Dimensional Dual
Radiator RICH
Joerg Reinhold
Florida International University, Miami
presented at
Hall C Summer Workshop
August 7, 2009
8/7/09 Joerg Reinhold, FIU 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
8/7/09 Joerg Reinhold, FIU 3
Cherenkov Radiation TriviaPrediction 1889? Noble Prize in Physics 1958
Pavel Alekseyevich Cherenkov Il´ja Mikhailovich FrankIgor Yevgenyevich Tamm
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)
€
cosΘ =1
βn⇒ β thr. =
1
n
d2N
dEdx=
2πα z2
hcsin2Θ or
d2N
dλ dx=
2πα z2
λ2sin2Θ
Np.e. = N0L sin2ΘCh with N0 =370 z2
cm eVεcollεdet dE∫
Typical bi - alkali cathode : εdet dE ≈ 0.27 eV∫Np.e. =100 cm-1 L εcoll sin2ΘCh
See e.g. O. Heaviside, Electromagnetic Theory(Chelsea Publishing Company,New York, 1971)
Oliver Heaviside
8/7/09 Joerg Reinhold, FIU 4
Motivation: Jefferson Lab at 12 GeV
PID with Cherenkov detectors
QuickTime™ and a decompressor
are needed to see this picture.
8/7/09 Joerg Reinhold, FIU 5
Ring Imaging Cherenkov Detector (RICH)
QuickTime™ and a decompressor
are needed to see this picture.
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).
8/7/09 Joerg Reinhold, FIU 6
QuickTime™ and a decompressor
are needed to see this picture.
Ring Imaging Cherenkov Detector (RICH)
8/7/09 Joerg Reinhold, FIU 7
QuickTime™ and a decompressor
are needed to see this picture.
Ring Imaging Cherenkov Detector (RICH)
QuickTime™ and a decompressor
are needed to see this picture.
Example: 1m x 1m area 1cm2 pads => 10,000 channels1cm stripes w/2-sided readout => 200 channels
8/7/09 Joerg Reinhold, FIU 8
Nuclear Instruments and Methods in Physics Research A333 (1993) 458-463North-Holland
A RICH detector for velocity determination of heavy ionsK. Zeitelhack, J. Friese, HA. Körner, J. Reinhold and R. SchneiderPhysik-Department E12, TU Munchen, Germany
QuickTime™ and a decompressor
are needed to see this picture. QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.QuickTime™ and a
decompressorare needed to see this picture.
8/7/09 Joerg Reinhold, FIU 9
Poor Man’s RICH Concept
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and aBMP decompressor
are needed to see this picture.
€
nWLS =1.49⇒ Θcrit. = 42o for total int. refl.
⇒ 49% of shifted photons reach PMTs
with wave shifting Q.E. ≈ 84% ⇒ εcoll ≈ 41%
8/7/09 Joerg Reinhold, FIU 10
Wavelength Shifter PropertiesCharles Hurlbut, ELJEN Technology, Sweetwater TX,
www.eljentechnology.com, private communication
QuickTime™ and aBMP decompressor
are needed to see this picture.
Waveshifting quantum efficiency ~ 84%.
8/7/09 Joerg Reinhold, FIU 11
KEK PS Experiment T554
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and aBMP decompressor
are needed to see this picture.
•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
8/7/09 Joerg Reinhold, FIU 12
T554 Results
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.
8/7/09 Joerg Reinhold, FIU 13
T554 Results
QuickTime™ and a decompressor
are needed to see this picture.
€
1- param. fit :
fixed nrad (λ = 350nm) =1.4767
⇒ εcoll. = 63.2%
2 - param. fit :
nrad =1.49 and εcoll. = 61.5%
w/out reflection losses at radiator/air & air/WLS boundaries
8/7/09 Joerg Reinhold, FIU 14
T554 Results: Discussion
•Digitized Q.E.s & transm.•Fold with Cherenkov spectrumExpect coll~65%
Agrees with external collectionHowever internal ~41%??Need to study theory ofCherenkov in absorbing media
8/7/09 Joerg Reinhold, FIU 15
Monte Carlo Simulation
QuickTime™ and a decompressor
are needed to see this picture.
•10 cm n=1.015 aerogel radiator•100 cm distance aerogel-WLS•50 WLS bars, 1 cm widecoll=61.5%
8/7/09 Joerg Reinhold, FIU 16
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.
MC Disributions & Likelihood PID
€
L Nhits,b, Np.e.,b( ) = Np.e.,b
Nhits,b e− Np.e.,b
Nhits,b!
Only consider "hit" or "not hit":
L Nhits,b = 0, Np.e.,b( ) = e− Np.e.,b
L Nhits,b ≥1, Np.e.,b( ) =1− e− Np.e.,b
LPIDi = L Nhits,b, Np.e.,b( )bars
∏
lnLPID= i = lnL Nhits,b, Np.e.,b( )bars
∑
LPID= inorm =
lnLPID= i
lnLp + lnLK + lnLπ
8/7/09 Joerg Reinhold, FIU 17
PID Efficiencies: 10 cm n=1.015
QuickTime™ and a decompressor
are needed to see this picture.
protons
kaons
pions
€
p ≤11 GeV : ε pp ≈100%
p >11 GeV : ε pp ≈ 98%, εpK ≈ 2%
p ≤ 8 GeV : εKK > 95%, εpK ≈ 2%
p >10 GeV : εKK < 70%, εKp ≈ 30%,εKπ ≈10%
εππ ≈ poor
8/7/09 Joerg Reinhold, FIU 18
Distributions at p=12 GeV10 cm n=1.015 aerogel radiator
QuickTime™ and a decompressor
are needed to see this picture.QuickTime™ and a
decompressorare needed to see this picture.
p
K
p
K
8/7/09 Joerg Reinhold, FIU 19
QuickTime™ and a decompressor
are needed to see this picture.
Dual Radiator10 cm n=1.015 & 100 cm C4F10
QuickTime™ and a decompressor
are needed to see this picture.
proton
kaon
pion
8/7/09 Joerg Reinhold, FIU 20
Comparison with other RICH
QuickTime™ and a decompressor
are needed to see this picture.
[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.
8/7/09 Joerg Reinhold, FIU 21
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