Plan for the muon detector and the toroid system simulation

1
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
What we want to do Design Update.

• The design of the muon system is changed since
  last TDR.

m1
m2
m3
Station 0 omitted. Nominal IP constraint instead
of (m0, m1) Shielding vs. Toroid?
3
Design Update vs Resolution

• Analytic study by Jim Wiss.

• f 90, 0, 270 degrees
• One vs. two toroids
• 2 (m2, m3 ) vs. 3 (m1 m2 m3) 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.

4
Toroid

• Study by Chuck Brown.

• Thickness of toroid 34, 51, 68 inches?
• Shape not final Octagonal or Box?

CERN POISSON
5
Muon Trigger Requirement

• 1st level With nominal beam spot constraint r
  information from the last two stations (within
  the same f segment), achieve dimuon Pt trigger.
• Also, from the detachment information from
  silicon detector, try single muon trigger.

6
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 p 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
Man-Power / Division of Labor.

• Geometry, delta-ray
• Trigger
• p punch-through

• Doris Kim (UIUC)
• Kevin Stenson (Vanderbilt)
• Weijun Xiong (Puerto Rico)

8
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(r) in
  f direction.
• Put stainless-steel muon stations with a varying
  inner radius.
• Put aluminum shields to reset delta-rays.

• p 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
Plan for Trigger Simulation
a delta-ray faking high energy muon

• Effect of Delta-rays

• Trigger
• (Noise) delta-rays p punch-through simulation
  will be in.
• 2 vs 3 stations scenario will be revisited. (see
  plot.)
• Current strategy Ideal track smearing
  efficiency reduction.

toroid
(toroid)
low energy muon
m1
m2
m3
m1 station as a discriminator?