# Presentation: 274984

## LC Muon Detector Studies Overview

- (mostly recent prototype hardware development plans)
- Fermilab
- A. Bross, B. Choudhary, G. Fisk, K. Krempetz, A. Para, O. Prokovief, R. Stefanski
- University of California at Davis
**M. Tripathi**, B. Holbrook, J. Lizarazo, Y. Bansal
- Northern Illinois University
- G. Blazey, A. Dychkant, D. Hedin, D. Chakraborty,G. Lima, **A. Maciel**, C. Milstene
- University of Notre Dame
- M. McKenna, M. Vigneault, B. Baumbaugh, **M. Wayne**
-  Wayne State University
**P. Karchin**, A. Gutierrez, R. Medipalli

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## Fe Cross Section

- 4.45m

- 6.55m

**Fe Thickness = 10 cm**
**         ****Gap  =  5 cm**

**1.5 cm**

- 

**5 cm**

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## 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.

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

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

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

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## Scintillator Layout and Strips

- Scintillator:  4.1 X 1 cm2
- co-extruded strips with
- 1 mm dia. WLS fiber and
- outer reflector of TiO2.

- U/V strips with wls shifted light exiting
- both ends.  Add left/right signals from
- clear fibers with optical OR to provide
- one signal per strip.

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## Prototype Module Layout

- 2.5m

- 5.0 m

**43 full strips**

- 3.6m (L) x  4.1cm (W) x 1cm (T)

**43 short strips**

- 3.6m => 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

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## 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**

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## MINOS Hamamatsu H6568 Multi-anode PM16 anodes ea. 4 x 4 mm2

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## MINOS – MAPMT with fiber guide

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## 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).
- 	=> 2.88km
- 	Kuraray 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 =  76m
- 	Full strips:  43*(3.6m +1.3m) = 211m
- 	Short 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

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## Multi-anode Photomultipliers

- 16 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

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## Other R&D Items

- Al 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

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## Incomplete R&D Cost Estimate

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## 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.

- Cornell ALC Workshop    Gene Fisk

- July 14 2003

## Slide 15

- Cornell ALC Workshop    Gene Fisk

- July 14 2003