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Muon System Studies for Linear Collider: Specifications, Detectors, and R&D Issues

Explore sources of muons, conventional and new physics, Higgs production, beamline muons, and muon rate summary. The text covers conventional and new physics muon events, beamline muons for NLC, JLC, and TESLA, and TESLA detector specifications. It delves into Fe thickness in TESLA detectors, muon system specifications for identification and tracking, and technologies like RPC and scintillator-based detectors. Touching on muon momentum, efficiency, and energy resolution, it discusses scintillator features, layout, and calibration. Additionally, it details proposed scintillator module layout, electronics, and mechanical engineering considerations for the muon system in the linear collider.

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Muon System Studies for Linear Collider: Specifications, Detectors, and R&D Issues

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  1. Gene Fisk – Fermilab 1/7/2002 Chicago LC Workshop Muon System Studies • Sources of Muons • Muon System Specifications • RPC Detector Studies • Scintillator Detector Studies • R & D Issues

  2. Sources of Muons • Conventional EW Physics • New Physics • Beamline Muons

  3. Conventional Physics –Muon Sources

  4. Higgs Production From J. Bagger et al, The Case for a Linear Collider ..

  5. *BR of H to one or more muons for H(140), ignoring Z =>bb +> m for H(350), …. BRH = BR(H=WW*2*BR(W=>m) + BRH = BR(H=WW*2*BR(W=>m) + BR(H=>bb*2*BR(b=> m) BR(H=>ZZ)*2*BR(Z=> m) + BR(H=>tt)*2*BR(t=> m) = 0.48*2*(1/9) + 0.37*2*0.1 = 0.68*2*(1/9) + = 0.181 0.31*2*0.03367 + 0.01*2*0.19 = 0.176

  6. BeamLine Muons T. Tauchi, LCWS_Sitges pg 811, and LCWS_2000 pg 107 Collimation using concentric magnetized axial toroids. B = 10KG; B+ for 1 < r < 10 cm; B- for 10 <r < 30 cm. ~1010 e’s/RF bucket with 0.1 - 1% lost in phase-space tails. Attenuation: ~1 X 105 - No shield ~3 X 107 - Collimation (x, y, px, py) w/o B ~109 - 1010 - Collimation w B Also will attempt to eliminate phase-space tails at 8 GeV. Expect < 1 to 10 beamline m’s per pulse.

  7. Muon Rate Summary • One year (107 s) at 1034 cm-2 s-1 is 100fb-1. • Conventional sources of muons: • 2 pb * 100fb-1 * 50% eff. = 100K events. • New Physics: Higgs => muons • 25 – 50 fb * 100fb-1 * 50% = 3 –5 K events • Beamline Muons: Assume 1m for each 1012 • electrons. • NLC: 190 pulses w/0.75 E10 e’s/pulse in • 266 ns => 1.46 m’s per train. • JLC: 72 pulses w/ 1.1 E10 e’s/pulse in • 202 ns => 0.8 m’s per train. • TESLA: 2820 pulses in 0.95ms => 29 pulses • in 10ms w/ 2E10e’s/pulse, => • 0.58 m’s per 10 ms.

  8. TESLA Detector • The Fe thickness is determined by: • Fe cross-sectional area for B flux return; • Muon identification requirements. • These imply 1.6m for the total Fe thickness.

  9. Muon System Specifications • Muon Identification by penetration through 12 – 14l. • Muon Charge & precise Momentum from central tracking. • Muon Tracking and Link-up with cent. tracking: ~15 hits • High Tracking Efficiency. • Tail-catcher Calorimeter. • Must identify conventional and new physics muons and background muons from the beams and cosmic surces. Candidate technologies: (1) Resistive Plate Chambers (2) Scintillator Based Detectors

  10. Central Tracking Momentum Resolution From: “Detectors for the Next Linear Collider” ed. J. Brau et al; Snowmass 2001

  11. Hit Density for b b Events Max. hit density (/sq. cm) From TESLA Design Report – M. Piccolo et al

  12. Efficiency vs. Muon Momentum Monte Carlo Muon Momentum From TESLA Design Report – M. Piccolo et al

  13. Leakage Hadronic Energy Resolution From: TESLA Design Report – M. Piccolo et al Calorimetric Energy for Hadrons Entering the Muon System

  14. Scintillator Based Muon System • Why scintillator? - Additional calorimetry needed. Cal depth is: 3.2l , 5.4l, 6.7l for NLC(P),TESLA, NLC(L) Example from Dishaw et al - Demonstrated technology. Robust. Used in many neutrino expts for m’s & h’s. MINOS, e.g. - Detectors can be calibrated – with effort. LED pulser plus initial beam tests. - With scintillator strips, m ’s can be tracked. - The precise measurement of of pm is done via central tracking. • Proposed Layout - 16 – 5cm gaps between 10cm thick Fe plates. - Module sizes: 940(L)X(174 to 252)(W)X1.5 cm3. - 4.1 cm X 1 cm extruded scint.: 8u & 8v planes. - Light output from both ends: 11(n) + 6(f) p.e.s. - Use multi-anode PM; 94K fibers X2 channels. - Expect ~ 1/√E for calorimetry.

  15. Sampling Calorimeter E379 P. Dishaw Thesis SLAC-216 Fe & Plastic Scintillator 30” H X 30” W Plates: 1 – 20 1.5” Fe 21 – 45 2” Fe 46 – 49 4” Fe 7.58l 11.52 l <E> = 389 GeV <E> = 400 GeV

  16. Steel Cross-section 4.45 m 6.55 m Fe thickness = 10 cm, Gap = 5 cm

  17. Scintillator Layoutu and v strips

  18. MINOS Scintillator One of the best modules Number of observed photoelectrons Distance along the module (m) Q.E. 13.5% 3.6 m Far – proposed geometry 6±2 p.e.s Near 11±3 p.e.s Light output using the full MINOS apparatus: Connectors, clear fibers, multi-anode PMTs, ….

  19. R & D Issues • Physics analysis for detector designs: • Shower leakage into the muon system; • Tracking studies for detector options; • Energy flow analysis using the muon system; • Muon system response to the broad spectrum of physics processes; • Muon system performance at 1 TeV. • Detector design questions: • Module layout; • cell sizes, materials, readout techniques • Electronics: • Evaluation of existing designs. For scintillator, what photo detector? What size and fiber arrangement? • Cables/fibers and cable/fiber routing; • FE electronics, multiplexing, readout, .. • Software vs. firmware; • Mechanical engineering: • Fe structures, installation problems, • detector module layout, tooling, ..

  20. R & D Issues (cont.) • Prototype detectors: • R&D Proposal and Schedule • Manpower and Budget • Testing facilities • Test Beam: • Test Beam Proposal • Experiment Proposal

  21. m & PID Parallel Session TalksTuesday 1/8/02 2pm Rm 208 1.    Robert J. Wilson: Hadron ID Fast Simulation in the LCD JAS Package: Status  - 10 min.  2.    M. Piccolo: TESLA Muon System Design: Progress and Plans   -   15 min.  3.    O. Prokofiev:  Aging Studies of CMS Muon Endcap Chambers  -  20 min.  4.    A. Para: MINOS Scintillator: Production and Test Results  -  15 min.  5.    D. Chakraborty: Preliminary Studies of Hadronic Shower Leakage into the LC Muon System   -  10 min.  6.    R. Stefanski  -  Costing Methodology   -   10 min. 

  22. Efficiency for BELLE RPC’s From the BELLE Website: http://beauty.bk.tsukuba.ac.jp/belle/nim/total/node88.html

  23. Channel Count, etc.

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