1

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

2

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.

3

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.

4

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.

5

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

6

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

7

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.

9

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?

10

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

_

11

B-pair Event

C. Milstene

12

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.

13

P Distribution for P3 GeV & P < 3GeV

in Barrel & EndCaps

14

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

_

15

Layers with non-zero HitsHCal & MuDet

MuDet

Coil

HCal

# of s 2.6 3.8 4.8 6.8 7.3 7.8

16

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

18

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

19

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

20

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