march 28, 1999doris y. kim, uiuc1 plan for the muon detector and the toroid system simulation...
TRANSCRIPT
March 28, 1999 Doris Y. Kim, UIUC 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
March 28, 1999 Doris Y. Kim, UIUC 2
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 2 3
Last TDR
March 28, 1999 Doris Y. Kim, UIUC 3
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.
x
y
dipole fieldtoroid field
March 28, 1999 Doris Y. Kim, UIUC 4
Toroid– Study by Chuck Brown. • Thickness of toroid: 34, 51, 68 inches?
• Shape not final: Octagonal or Box?
CERN POISSON
March 28, 1999 Doris Y. Kim, UIUC 5
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.
March 28, 1999 Doris Y. Kim, UIUC 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 punch-through coming in from the calorimeter side simulated, even though the effect for the upmost station will be huge.• No delta-ray simulation.
March 28, 1999 Doris Y. Kim, UIUC 7
Man-Power / Division of Labor.
– Geometry, delta-ray :
– Trigger :
– punch-through :
Doris Kim (UIUC)
Kevin Stenson (Vanderbilt)
Weijun Xiong (Puerto Rico)
March 28, 1999 Doris Y. Kim, UIUC 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() 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.
March 28, 1999 Doris Y. Kim, UIUC 9
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 2 3
low energy muon
a delta-ray faking high energy muon
station as a discriminator?
– Effect of Delta-rays
toroid(toroid)