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ILC/SiD Muon System Progress Colorado State – D. Warner, R. Wilson
Fermilab – G. Fisk, C. Milstene
UC Davis – J. Lizarazo, M. Tripathi
Indiana University – R. Abrams, R. Van Kooten
Northern Illinois University – G. Blazey,
D. Chakraborty, A. Dychkant, G. Lima, A. Maciel, V. Zutshi,
University of Notre Dame – M. Wayne
Wayne State University – P. Karchin
University of Wisconsin – H. Band
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ILC/SiD Muons - Organization
• Simulation: A. Maciel, G. Lima, C. Milstene
• Scintillator-strips: A. Dychkant, G. Fisk, R. Abrams, M. Wayne, M. McKenna, FNAL/NIU
• Multi-anode PMTs: P. Karchin
• GM-APDs – D.Warner, R. Wilson
• RPCs – H. Band
• Strip Plane Assembly: at UND: M. Wayne
• Electronics: M. Tripathi, R. Abrams
• Testing: R. Abrams, R. VanKooten, G. Fisk
• Testbeam: D. Chakraborty, V. Zutshi, R. Abrams, et al.
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Snowmass and SinceAt Snowmass:
• 2.4 m radial Fe for central B flux return. => 24 X 10cm gives 23 - 5cm gaps for detector planes.
• For study: ~0.5mm defn of incoming ’s may be useful for: multi-muons, high energy ’s & separation of ’s & hadrons.
• Need for a separate muon detector.
Both hardware and software studies needed.
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Strip-Scintillator Hardware R&D Goals:• Understand
existing tech.• Establish LC -
det. specs.• Electronics
specs.• Estimate costs.• Iterate on
design/R&D/costTwo 2.5 m X 1.25m 64 strip planes being tested. H7546B MAPMT
and a standard single anode PMT are being used for initial tests.
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1
2
64
Scintillator Strips
Wavelength-Shifter Fibers
Cookie MAPMT
Connector Box RG/174
Cables
12
64
Clear FibersRG/174
Cables
2249A ADC
2249A ADC
2249A ADC
2249A ADC
Trigger Gate
DAQ/PC
CAMAC
8 x 8 arrayDiscr& coinclogic
ScalersDelay
NIM
Test Setup in Lab 6
R. Abrams
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ILC Scintillator-based Muon Detector R&DUC Davis, Indiana, Notre Dame, Wayne State, Fermilab
Cosmic Ray Trace - Anode 8 ABF(3/3)
-35.00
-30.00
-25.00
-20.00
-15.00
-10.00
-5.00
0.00
5.00
-190.00 -170.00 -150.00
Time(ns)
Vo
ltag
e(m
V)
TEK060 CS137 Source, 50 mV Threshold, Anode #8
-0.12
-0.1
-0.08
-0.06
-0.04
-0.02
0
0.02
-1.00E-08 -5.00E-09 0.00E+00 5.00E-09 1.00E-08
• Scintillator –strip tests in Lab 6 on two 1.25m X 2.5 m planes.• MAPMT H7546B photo-detector (64 anodes). Integration of
the current for the right-hand plot signal gives Q = -3.8 pC= 2.4 E07 electrons. WLS decay time ~12 ns.
5 ns/div.
Cs Source
<= 15 ns =>
Cosmic Rays
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Preliminary Data and Analysis• Rise-time is very fast ~1ns; WLS (Y-11) decay time
is much slower. It is recently measured to be 12.1 ns in 1mm dia fiber.
• Multiple pulses are observed and also reflected light.
• Our plan was to use time-over-threshold to measure charge. Our new plan is to integrate the MAPMT pulses using LeCroy 2249a ADCs to measure charge collected vs. longitudinal position of charged particles that pass thru the scintillator strips.
• When we have independently measured the MAPMT gain vs. HV we will then know the number of photo-electrons.
• Need more than eposodic data and analysis!
8
Further Tests and Issues• Presently drafting an MOU with Fermilab
to use the Mtest beam to test 4 modules – two shown in the picture and two that are being finalized at UND.
• Some data before the end of February when a 14 week shutdown will occur?
Limited scope for first tests: • ADC measurement of PMT pulse charge;
Also need bench meas. of Gain vs. HV.• If possible charge vs. longitudinal pos’n
along several strips on the 4 planes.
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More Issues
• Mtest in July and beyond - Muons and PWCs to measure efficiency vs. transverse pos’n.
• Collaborate with ANL/NIU on calorimeter/tail catcher preliminary measurements.
• SiPMs – Will work with NIU, Russians, Irish, Asians to test Si detectors.
• Faster WLS – longitudinal pos’n from timing.• Readout on both ends needed?• Two 1.2mm fibers in one 2mm X 2mm pixel?• RPCs?• International collaborators?
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Muon ID with b – b Events HCal & MuDet
• 10,000 inclusive b-pair events.• Use charged tracks in the barrel.• 0.9 2.2• P 3 GeV/c
Caroline Milstene
_
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B-pair Event
C. Milstene
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P-Distribution of & Generated vs Detected from 10000 B-Bbar
•Generated Pions Yellow•Generated Muons light blue •Detected Muons• navy blue •Pions Detected as Muons in Red.
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P Distribution for P3 GeV & P < 3GeV
in Barrel & EndCaps
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10,000 b – b Events
Barrel μ π K Protons
Generated 1147 55805 8310 2816
Generated
P>3 GeV 787 18666 4473 1622
Recons.
P>3GeV
Fitted
739
715
18024
17120
4304
4072
1614
1579
_
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Layers with non-zero HitsHCal & MuDet
MuDet
Coil
HCal
# of s 2.6 3.8 4.8 6.8 7.3 7.8
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Muon ID Algorithm1) Project charged tracks into Hcal and MuDet.
2) (mr Hcal
(mr MuDet
Road in Hcal = (23)
Road in MuDet = (22)
• Examine the # of hits in the angular road: – minimum ionizing = 1 or 2 hits (boundary Xing)h - # of hits > min-I and/or gaps in layers = 0’s.
(4) Ns = No exp(-l/) Require min-I+ in last 5 gaps HCal
17
Example of Muon ID With HCal BarrelRequiring 24 hits/24 layers
Conditions for
10000bb_bar
Tracker Recons
& Final Tracks
Muons
739
Pions
18024
Kaons
4303
Protons
17120
Good Fit
Tracker
715 17120 4072 1579
1≤ minHCalHit ≤2
1≤ 5lastHCalLay ≤3
715
681
2874
222
966
127
140
9
HCal
≥24hits,≥24layers 681 182 112 5
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Example of Muon ID MuDet Barrel12 hits/ 12 layers
Conditions for
10,000 b Pairs:
Tracker Recons
& Final Tracks
Muons
739
Pions
18024
Kaons
4303
Protons
1712
Good Fit
Tracker
715
(705)
17120 4072 1579
1≤ minHCalHit ≤2
5lastHCalLayer >0
700
700
588
357
249
204
26
15
Mudet
≥ 12hits ≥ 12layers
671 77 50 5
Min Mudet Hits ≤2
Max Mudet Hits≤7
670 69 39 5
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Efficiency & Purity vs. #
Eff. & Purity vs. Interaction Lengths
0
0.2
0.4
0.6
0.8
1
0 2 4 6 8Interaction Lengths
Eff
icie
nc
y/P
uri
ty
Eff
Purity
• Eff. ~95%
• Purity improves w/ increasing λ
~69% => ~86%End Of HCal
C. Milstene
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Conclusions & Comments• First measurements from ¼ scale strip scintillator
planes obtained.• Need more systematic studies => beam tests
indicated; Mtest MOU coming.• Calibration of MAPMT gains, on-board calib.?• Too many loose ends to make an adequate cost
estimate; double ended readout, SiPMs, faster WLS, etc. Existing scintillator/MAPMTs look OK, but perhaps there is something better (Si). Longitudinal pos’n from timing?
• Muon ID studies indicate the need for a muon system. 7 is not enough.
• Need to look at other physics benchmarks to test present Muon ID algorithms. Continue muon software efforts.
• Forward muons need a sponsor!
21
P Distribution of//K/p Identified as ’s
22
23
24
Hardware Development
P. Karchin – Scintillator Based Muon System Collaboration page 14 1/8/2004
Layout of Scintillator Strips in one Plane
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