July Cornell ALC Workshop Gene Fisk1 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

July Cornell ALC Workshop Gene Fisk2 Steel Cross Section 4.45m 6.55m Fe Thickness = 10 cm Gap = 5 cm Fe Cross Section 1.5 cm  5 cm

July Cornell ALC Workshop Gene Fisk3 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 45 o 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  E h /E h ~ 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.

July Cornell ALC Workshop Gene Fisk4 50 GeV  - event 11 run 0 EyeFish View-18 hits in Muon Detector

July Cornell ALC Workshop Gene Fisk5 Scintillator Layout and Strips Scintillator: 4.1 X 1 cm 2 co-extruded strips with 1 mm dia. WLS fiber and outer reflector of TiO 2. 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.

July Cornell ALC Workshop Gene Fisk6 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*( ) fibers/side =128 channels = 8 (1.2mm dia) fibers/pix * 16(4 x 4mm 2 ) pixels => Equivalent of One MAPMT/prototype plane

July Cornell ALC Workshop Gene Fisk7 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 Tonnes. Scintillator Cost - MINOS paid ~ $10/kg or $10K/tonne. Assume a 50% add’l cost for a small order: $16K

July Cornell ALC Workshop Gene Fisk8 MINOS Hamamatsu H6568 Multi-anode PM 16 anodes ea. 4 x 4 mm 2

July Cornell ALC Workshop Gene Fisk9 MINOS – MAPMT with fiber guide

July Cornell ALC Workshop Gene Fisk10 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

July Cornell ALC Workshop Gene Fisk11 Multi-anode Photomultipliers 16 channel multi-anode PM 30mm Hamamatsu H anode PM’s come in two varieties: w/ or w/o base. H with base $ ea. for 6 or more. R M16 w/o base $ 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

July Cornell ALC Workshop Gene Fisk12 Other R&D Items Al skins: (top and bottom) 150 $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

July Cornell ALC Workshop Gene Fisk13 Incomplete R&D Cost Estimate

July Cornell ALC Workshop Gene Fisk14 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.

July Cornell ALC Workshop Gene Fisk15