scintillation counters for the cdf muon upgrade dpf 2000, columbus ohio
DESCRIPTION
Scintillation counters for the CDF Muon Upgrade DPF 2000, Columbus Ohio G. Pauletta, for the CDF Collaboration. Outline : Overview upgrade objectives and the role of the scintillation counters The Run I counters Characteristics, performance and problems - PowerPoint PPT PresentationTRANSCRIPT
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CDF
Aug. 20th, 2000 1
Scintillation counters for the CDF Muon Upgrade
DPF 2000, Columbus OhioG. Pauletta, for the CDF Collaboration
Outline:Overview
upgrade objectives and the role of the scintillation counters
The Run I countersCharacteristics, performance and problems
Filling the holes and extending the coverage: New countersdesign and performance
Refurbishing old countersmethod and results
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CDF
Aug. 20th, 2000 2
Muon Upgrade objectives
Trigger on muons at increased luminosity ( >1032) and shorter bunch crossings (396 ns, 132 ns) Increase coverage
RUN I -------- > RUN II
CMU CMP/CSP CMX/CSX BMU/BSUCoverage 0<<0.6 0<<0.6 0.6<<1 1<<1.5drift time 800 ns 1.4 s 1.4 s 800 ns
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CDF
Aug. 20th, 2000 3
The muon trigger
scintillation ctrs. serve to“time stamp” and/or reduceuncorrelated b.g. at level 1
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CDF
Aug. 20th, 2000 4
Muon Upgrade subdetectors
Central Muon eXtension(CSX + CMX)
“miniskirt” (new)lower 90o
Intermediate MuonBMU + BSU + TSU (new)
Central MuonuPgrade (CSP + CMP)(new)(old)
Central Muonchambers
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CDF
Aug. 20th, 2000 5
Old counter design
EMI 9815 PMT
PVT - base scintillator (NE114)
3 m long
30 cm
2 cm thick
CSPs
CSX “minskirt counter”
CSX “arch” counters
~ 2m
~ 2 m
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CDF
Aug. 20th, 2000 6
New counter design
Scintillator: UPS-923A from Monokristal, Kharkov, Ukraine. Polystyrene doped with PTP(2%) and POPOP(.03%)
Ctr. type number dimensions
CSP 150 320cm x 30.5cm x 2 cmBSU 432 164 cm x 17 cm x 1.5 cm
Wls fiber: double - clad Y11 fiber from Kuraray fiber “mirrored at far end.
Hamamatsu H5783 photomultiplier + Cockroft - walton base
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CDF
Aug. 20th, 2000 7
Counter readout
Wls fiber
PAD
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CDF
Aug. 20th, 2000 8
New counter assembly
PAD
LED
LED
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CDF
Aug. 20th, 2000 9
Counter output calibration
Each counter output is calibrated in absolute terms (number of photoelectrons/ADC channel) by exposing it to low - level pulsed light ( ~1 p.e./pulse) and locating the centroid single p.e. distribution.
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CDF
Aug. 20th, 2000 10
Counter response ( in photoelectrons) to cosmic muonsis measured in steps of ~20 cm and the results are fittedto extract counter characteristics
Measurements are automated (4 ctrs at a time)Offline fit
npe(x) = n0(exp(-x/l) + r * exp(-(2L -x)/l))From the fit , one extracts:n0 (zero extrapolation)r (reflection coefficient of fiber mirrors)keeping known fiber attenuation constant at 3 m
npe
distance (x) from pmt
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CDF
Aug. 20th, 2000 11
RUSSIAN L3 COUNTER ASSEMBLY AND TEST RECORDSLum gain at gain at LED
L3 n pe at PMT sens 800 v 950 v Attenuation measurement PLATEAU AMPL at
counter 315 cm s/n E-05 E+05 E+06 n 0 nend r nend' EAST WEST PAD # Voltage PLATEAU
85 24.5 5440 6.91 6.27 2.47 37.1 24.6 0.85 25.0 1 850 8.186 21.7 5436 7.35 4.69 3.44 37.5 23.8 0.76 23.0 1 23587 23.1 4515 7.93 2.62 2.98 30.3 18.3 0.66 18.0 1 950 6.988 27.7 4704 6.20 4.65 3.40 35.1 22.1 0.74 21.0 1 875 9.6
Fermi VS Dubna NPE
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
1 9
17
25
33
41
49
57
65
73
81
89
97
10
5
Fermi NPE
Dubna NPE
CSP Test Results
0
2
4
6
8
10
12
14
16
18
20
Number of photoelectrons at 20cm from end
fre
qu
en
cy
csp yield
Counter parametersand test results using cosmic muons
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CDF
Aug. 20th, 2000 12
Problems with “Old” counters:efficiencies were lower than expected
CSP efficiencies CSX efficiencies
time dependence evident
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CDF
Aug. 20th, 2000 13
Attenuation - length for good an bad counters
Response to cosmic muonsconfirms degradation in
attenuation-lengthand
reveals a correspondingdegradation in light yield
Or LED
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CDF
Aug. 20th, 2000 14
We unwrap some counters
Good NE114 Bad NE114
Most of the countersdisplay pronounced
aging effects
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CDF
Aug. 20th, 2000 15
Old Counter refurbishment:wls fiber ribbon addes to one side and routed to
existing pmt
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CDF
Aug. 20th, 2000 16
CSP Repair: Work at Lab 5
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CDF
Aug. 20th, 2000 17
npe at 20 cm from end
0
2
4
6
8
10
12
14
16
18
20
1 4 7 10 13 15 19 22 25 28 31 34 37 40
npe
freq
. Series1
Series2
npe at 20 cm from PMT
0
2
4
6
8
10
12
14
16
npe
frew
. Series1
Series2
Distributions of fixed counter outputs
Average npe = 16 p.e. Average npe = 58 p.e.
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CDF
Aug. 20th, 2000 18
Muon Upgrade objectives
Trigger on muons at increased luminosity ( >1032) and shorter bunch crossings (396 ns, 132 ns) Increase coverage
RUN I -------- > RUN II
CMU CMP/CSP CMX/CSX BMU/BSUCoverage 0<<0.6 0<<0.6 0.6<<1 1<<1.5drift time 800 ns 1.4 s 1.4 s 800 ns