MICE Beamline PID w Aerogel Counters
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Transcript of MICE Beamline PID w Aerogel Counters
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MICE Beamline PID w Aerogel MICE Beamline PID w Aerogel CountersCounters
•Lucien Cremaldi Aerogel R&D and Test Beam•Ghislain Gregoire Design and Simulation•Don Summers Aerogel Procurement & Mirrors
•Jim Reidy Jr. -Quarknet Teacher - TB Aerogel Counter•David Sanders, Peter Sonnek, Brooke Rankins- R&D, DAQ•Mike Reep and Scott Watkins- Machine Shop•Romulus Godang - GEANT4, RECO
•Matsusita- Aerogel Samples
•Hideyuki Sakamoto G4MICE
•Vittorio Palladino PID Watchdog Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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2 Threshold Aerogel Counters2 Threshold Aerogel Counters
Aerogel Counter
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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A
B
C
ISIS Beam Line ISIS Beam Line
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Beam Spot at z = Beam Spot at z = 20.76m
• 4x4 Aerogel Array Provides ample coverage.• ~95% containment in 3x3.• Array is offset from x,y = 0,0.• Triangle tiles can reduce cost.• Variation of Beam Spot size over counter length is minimal.
Triangle tiles
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Matsushita Electric WorksMatsushita Electric Works
1.030+-0.001
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Matsushita Aerogel SamplesMatsushita Aerogel Samples
n=1.03 n=1.07(1.08) n=1.12
115 x 115 x 10.5 mm3 115 x 115 x 11.5 mm3 115 x 115 x 11.5 mm3
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Matsushita Aerogel Samples(2)Matsushita Aerogel Samples(2)
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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0
20
40
60
80
100
200 300 400 500 600 700 800
Forward Transmission
%T
λ ( )nm
0.638
C =0.041
0.252
T = A exp{ -t C/λ4} Rayleigh-like
n A C1.03 98.99 0.0411.08 98.84 0.2521.12 96.96 0.638
t(nm) sample thicknessλ(nm) wavelength
Forward TransmittanceForward Transmittance
• Blue photons are re-scattered w dN/dq = 1+cos2. • Absorption believed to be minimal.
1.03
1.07
1.12
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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0.1
1
10
100
300 400 500 600 700 800
Aerogel Scattering Length
x112
x103
X108
Scattering Length Xo (cm)
Wavelength (nm)
Scattering Length Scattering Length T=To T=To exp(-x/xo)exp(-x/xo)
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Muon Momentum SprectraMuon Momentum Sprectra
• Run Configuration of good Mu/Pi (T.Roberts)• Muons Peaking at 220 MeV/c• Pion show high energy tail (p>350 MeV/c removed by tracking??)
16200
280
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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PE Threshold PlotsPE Threshold Plots
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Muon Detection EfficiencyMuon Detection Efficiency
The efficiency at low momenta could be improved by increasing the thickness of the radiator
The efficiency drop at low momenta is due to the proximity of the muon threshold in n=1.12 aerogel
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Unambiguous separation of muons and pions
Misidentified pions in the range 285 to 320 MeV/c (32 pions / 385
muons)
Remember: the pion sample is exaggerated by a factor 40
002.0385
4032
=i.e. an actual pion impurity in this configuration only
There is no need for a momentum cut
Momentum Distributions of Triggers
112on/107off
112on/107on
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Purity Matrix(4)Purity Matrix(4)
• Purity = Percent of good muons for a particular Trigger Configuration.• Muon Purity >99% Pion Misid < 1.2 x 10-4
PurityPurity
107off/112off 107off/112on 107on/112on
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Aerogel CounterDesign (1)Aerogel CounterDesign (1)
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Aerogel Counter Design (2)Aerogel Counter Design (2)
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Dimensions (3)Dimensions (3)
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Radiator (4) Radiator (4)
Collection Mirror3mm Lexan Sheet
Radiator Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Conical Mirror (4)Conical Mirror (4)
2-axis elliptical cone
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Paper Model (5)Paper Model (5)
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Test Beam(1)Test Beam(1)
•Fermilab Meson Test July'06•Beam 150 GeV p (b=1)•Aerogel 1.03, 1.07, 1.12
200 GeV/c p
aerogel
Tyvek
Rotating Table
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Test Beam(2)Test Beam(2)
20 PE
24 PE
107 ADC counts
112 ADC counts
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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Road MapRoad Map
Price (2 det) -64 Aerogel x $350USD ~ -64 Aerogel x $350USD ~
$25K$25K
-Reflectors -Reflectors $5K $5K
-Steele Boxes -Steele Boxes $5K$5K
-Table -Table $5K$5K
-Installation and checkout-Installation and checkout$5K$5K
-Shipping-Shipping $5K$5K
-(8-12) PMTs HARP-(8-12) PMTs HARP okok
~50-~50-60K60K
-Parts Fabricated in UM shop.-Parts Fabricated in UM shop.
-Mechanical Drawings GG.-Mechanical Drawings GG.
-Mirrors Coated by Outside Vendor.-Mirrors Coated by Outside Vendor.
Summer ‘06Summer ‘06 = 1 @ FNAL = 1 @ FNAL1x1x1 module1x1x1 modulewhite reflectorwhite reflectorMeasure pe yieldsMeasure pe yields
May ‘07May ‘07Mechanical AssemblyMechanical Assembly
Fall- 06Fall- 06Mechanical fabrication Mechanical fabrication Reflectors/ConesReflectors/ConesAerogel purchase??Aerogel purchase??
Summer ‘07Summer ‘07Aerogel Installation at RALAerogel Installation at RAL
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,
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• Aerogel Technology well suited to augment m p PID in MICE beamline.
• Photoelectron yield adequate for high efficiency and low misid rate.
• Mechanical design highly advanced.
• Fabrication staightforward.
• Ready to install in MICE in Fall ‘07.
• TRD Update & Saftey Sheets completed (Ghislain).
• PID Review set for Oct. 12-13 at RAL Meeting.
SummarySummary
Lucien Cremaldi*, MICE Collaboration Meeting Oct 8-11, RAL.,