July 14 2003 Cornell ALC Workshop Gene Fisk 1

LC Muon Detector Studies Overview

(mostly recent prototype hardware development plans)

FermilabA. Bross, B. Choudhary, G. Fisk, K. Krempetz, A. Para, O. Prokovief, R. Stefanski

University of California at DavisM. Tripathi, B. Holbrook, J. Lizarazo, Y. Bansal

Northern Illinois UniversityG. Blazey, A. Dychkant, D. Hedin, D. Chakraborty,G. Lima, A. Maciel, C.

Milstene

University of Notre DameM. McKenna, M. Vigneault, B. Baumbaugh, M. Wayne

Wayne State UniversityP. Karchin, A. Gutierrez, R. Medipalli

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Steel Cross Section

Steel Cross-section

4.45m

6.55m

Fe Thickness = 10 cm

Gap = 5 cm

Fe Cross Section

Gap View

5.95

6.15

2.4 2.6

1.5 cm

5 cm

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The Big Picture - Orientation

• Scintillator based muon system aims to do both muon identification via their penetration through the solenoid return yoke (> 1.4m Fe) and the measurement of hadronic shower energy that escapes out the back of the Hcal. Our candidate geometry for the detector planes consists of scintillator strips with 1.2mm dia. WLS fiber that captures light and pipes it to multi-anode PMTs outside the return yoke Fe. The strips are oriented at 45o w.r.t. the beam axis to make alternating u and v planes with increasing radius.

• From measurements that MINOS has done we expect a m.i.p. will give ~ 15 p.e. per hit.

• The expected hadronic energy resolution Eh/Eh~ 1/√E, but this must be measured.

• Simulation studies show that muon ID is efficient using this prototype design and that in most cases the muons can be tracked back into Hcal.

• Over the past year, the universities who have joined the LC muon detector studies, have organized to embark on the development of prototype detector planes.

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50 GeV - event 11 run 0 EyeFish View-18 hits in Muon Detector

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Strip Layout

0

0.5

1

1.5

2

2.5

3

0 1 2 3 4

meters

met

ers

Scintillator Layout and Strips

Scintillator: 4.1 X 1 cm2

co-extruded strips with1 mm dia. WLS fiber and outer reflector of TiO2.

U/V strips with wls shifted light exiting both ends. Add left/right signals fromclear fibers with optical OR to provideone signal per strip.

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Prototype Module Layout

2.5m

5.0 m

43 full strips

3.6m (L) x 4.1cm (W) x 1cm (T) 43 short strips3.6m => 0m long

Read out: both ends of full strips; one end of short strips (except the shortest 22).2*(43 + 21) fibers/side =128 channels = 8 (1.2mm dia) fibers/pix * 16(4 x 4mm2) pixels => Equivalent of One MAPMT/prototype plane

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How many prototype planes & strips?

• Each plane is the equivalent of 86 strips that are 3.6 m long. Each strip has a mass of 1.52 kg or 3.3 lbs.

• The weight of a plane (86 strips) is 131 kg or 288 lbs. Order 15% extra scintillator – 100 strips per plane or 330 lbs (152kg).

• 3 u & 3 v to over-constrain a straight line = 6 planes + one spare to use for resolving multi-hit ambiguities. => 7 planes.

• Total scintillator is 2,341 lbs (1.17T) or 700 strips or 1.064 Tonnes.

• Scintillator Cost - MINOS paid ~ $10/kg or $10K/tonne. Assume a 50% add’l cost for a small order:

$16K

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MINOS Hamamatsu H6568 Multi-anode PM

16 anodes ea. 4 x 4 mm2

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MINOS – MAPMT with fiber guide

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Fiber quantities and costs• WLS Fiber

Buy enough to instrument every strip: 100 strips*3.6m/strip = 360 m times 8 planes (one to learn on).=> 2.88kmKuraray quote of $3.29m => $9,475 plus shipping & duty

so add $1,500, which brings the total to: $11K WLS• Clear Fiber

From engineering drawing:Short near strips: 21*3.6 m = 76mFull strips: 43*(3.6m +1.3m) = 211mShort far strips: 21*3.3m = 69m

Total 356m => 390m times 8 planes

3,120 m Clear cost = 3.12km*$3.11K/km = $9.7K +$1.5K = $11.2K

Clear

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Multi-anode Photomultipliers16 channel multi-anode PM

30mm

Hamamatsu H6568

16 anode PM’s come in two varieties: w/ or w/o base.

H8711-10 with base $1290.85 ea. for 6 or more.

R7600-00-M16 w/o base $1011.37 ea. for 6 or more.

We will need at least 14 MAPMTs for R&D:

8 for the 7 planes;

2 to replace two loaner tubes (spares);

4 for bench tests of electronics;

Procure 7 w/bases; 7 w/o bases.

Cost: $9,036 + $7,080 = $16,116

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Other R&D ItemsAl skins: (top and bottom) 150 lbs. @ $3/lb => $450/plane;

8 * 450 = $3,600

Epoxy: $1000

Routing, connectors & clear wave guides: Mitch Wayne – Notre Dame

Calibration Scheme/Hardware: Paul Karchin – Wayne State

FE & readout electronics: Mani Tripathi – UC Davis & Paul Karchin – Wayne State

Cables, PS, Crates, Trigger, DAQ: Mani Tripathi – UC Davis

Testing: QC for scintillator/fiber – Fermilab, NIU & ND Cosmic Ray & Source tests at Fermilab – All Beam Tests – Not yet planned

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Incomplete R&D Cost Estimate

Item Cost (K$) Institutions Scintillator Strips 16 FermilabWLS Fibers 11 Fermilab/Notre DameClear Fiber for planes 11 Fermilab/Notre DameMAPMTs 16 UC Davis/Wayne St.Al skins, epoxy, misc. 5 Fermilab Sub-total 59 Contingency(40%) 24 Total 83

Fiber connectors./Wave guidesCalibration scheme, light pulserPower supplies (LV & HV) PREP?Front-end & readout electonicsADC system (use existing eq., PREP)Trigger & DAQ system (old eq.)Test equipmentTest stand development (resuscitate Lab 3 w/some costs)

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Outlook• We will order scintillator strips and fiber after appropriate

review of our R&D prototype design.

• There is effort on most R&D topics, but not all; e.g. multiplexing scheme needs study. With the scintillator extrusion machine in Lab 5 at Fermilab, there are a number of questions that could be investigated, some of which require event simulation studies, e.g. optimal strip width.

• We are making slow, but positive progress. Pace is largely dictated by money and manpower. Manpower needs to increase significantly for more rapid progress. University collaborators would do more with increased funding which, we hear, is, or will happen.

• Muon detector studies are at an interesting point, both with regard to software, such as muon identification, and hardware, such as prototype detector development.

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