1. March 28, 1999Doris Y. Kim, UIUC1 Plan for the muon detector and the toroid system simulation Content –What we want to do: Design Update. Toroid. Muon Trigger. –Current MC Situation. –Man-power. –Plan. Doris Y. Kim UI Urbana-Champaign. For the sake of March 28, 1999 BTeV Meeting

2. March 28, 1999Doris Y. Kim, UIUC2 What we want to do: Design Update. – The design of the muon system is changed since last TDR. Chuck Brown’s Station 0 omitted. Nominal IP constraint instead of (  0,  1 ) Shielding vs. Toroid? 11 22 33 Last TDR

3. March 28, 1999Doris Y. Kim, UIUC3 Design Update vs Resolution – Analytic study by Jim Wiss.  = 90, 0, 270 degrees One vs. two toroids 2 (  2,  3 ) vs. 3 (  1  2  3 ) stations. Nominal beam center constraint is used. Assumed rms spatial res 2.5mm. Interference between dipole and toroidal fields is reduced with 2 toroids instead of 1. With 2 toroids, res. difference between 2 and 3 station cases is small, but this is ideal situation. dipole field toroid field

4. March 28, 1999Doris Y. Kim, UIUC4 Toroid – Study by Chuck Brown. Thickness of toroid: 34, 51, 68 inches? Shape not final: Octagonal or Box? CERN POISSON

5. March 28, 1999Doris Y. Kim, UIUC5 Muon Trigger Requirement 1st level: With nominal beam spot constraint + r information from the last two stations (within the same  segment), achieve dimuon Pt trigger. Also, from the detachment information from silicon detector, try single muon trigger.

6. March 28, 1999Doris Y. Kim, UIUC6 Current Situation of the muon system simulation. In Mcfast – Considerable material in event generation, the silicon tracking system and the calorimeter system. – But just skeleton of the muon system. Geometry is not correct: For each arm, two tube-shaped iron absorbers instead of toroids, etc. No muon trigger simulation in both 1st (stand-alone) and higher levels (conjunction with other detectors). No  punch-through coming in from the calorimeter side simulated, even though the effect for the upmost station will be huge. No delta-ray simulation.

7. March 28, 1999Doris Y. Kim, UIUC7 Man-Power / Division of Labor. – Geometry, delta-ray : – Trigger : –  punch-through : Doris Kim (UIUC) Kevin Stenson (Vanderbilt) Weijun Xiong (Puerto Rico)

8. March 28, 1999Doris Y. Kim, UIUC8 Plan / How we will proceed. – For the sake of coming TDR, simplify as much as possible. Geometry Put two ideal toroids (1.5 T) each arm: B(  ) in  direction. Put stainless-steel muon stations with a varying inner radius. Put aluminum shields to reset delta- rays.  punch-through Parameterize no. and position of particles from punch-through, either by measurement or detailed simulation (Geant) information. Search for the best geometry of the absorber. Getting preliminary results now, any suggestions welcome.

9. March 28, 1999Doris Y. Kim, UIUC9 Plan for Trigger Simulation Trigger (Noise) + delta-rays+  punch- through simulation will be in. 2 vs 3 stations scenario will be revisited. (see plot.) Current strategy: Ideal track + smearing + efficiency reduction. 11 22 33 low energy muon a delta-ray faking high energy muon   station as a discriminator? – Effect of Delta-rays toroid(toroid)