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Timothy Carlisle Oxford. Tracker Reconstruction. Reconstruction in G4MICE. Simulate  Digitize  Reconstruct TrackerRec / package 4 or 5 point tracks ( Kalman fit) root files for each Tracker Station No TrackerRef Plane as yet Use station 1 as ref.  innermost stations.

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reconstruction in g4mice
Reconstruction in G4MICE
  • Simulate  Digitize  Reconstruct
  • TrackerRec/ package
  • 4 or 5 point tracks (Kalman fit)
  • root files for each Tracker Station
    • No TrackerRef Plane as yet
  • Use station 1 as ref.  innermost stations
track fitting efficiency
Downstream Tracker

Upstream Tracker

Track Fitting Efficiency

99%

99%

Inner station

Inner station

10,000 muons

6mm beam

Two Trackers, no material

Step IV fields

x resolution
x Resolution
  • 10,000 events, e =6mm
  • Res. 0.7 mm at stations 1 & 2
  • Res. ~1.2 mm at outer stations
  • Feature of fitting algorithm?

Station 5

Station 1

10,000 muons

6mm beam

Step IV fields

momentum resolution
Momentum Resolution

Px

Pz

  • (mcPx-TrkPx) ~ 1 MeV/c
  • (mcPz-TrkPz) ~3.7MeV/c

10,000 muons

6mm beam

Step IV fields

de dx
dE/dX?
  • Landau distribution is ~3 MeV wide
  • Ptotal resolution ~ 3.9 MeV/c
  • Pz res. the weak link
  • EMR / ToFs?

Ptotal

transverse amplitude
Transverse Amplitude
  • Single particle emittance
  • Useful for selection cuts
  • Beastly:
  • Calc. using mc trutha b g for beam envelope
amplitude resolution
Amplitude Resolution
  • 0.3mm < DAmpSq< 0.8mm depending on the station
  • Unclear why sign change...

Station 5

Station 1 (Inner)

10,000 muons

6mm beam

Step IV fields

crude cooling measurements
[Crude] Cooling Measurements
  • 35cm LH2
  • Calc. e at each station
  • Inner station  ref. plane
  • 4.5% cooling (mc truth)
  • TrkMC: 5.5%
  • TrkRec: 3.8%

Emittance

[mm]

Black – mc [Virtual Planes], 98.5% Transmitted

Green – Trk mc

Blue – reconstructed

10,000 muons

6mm beam

Two Trackers, LH2

Step IV fields

Abs(mc – rec) < 50 for x, y, px, py

energy
Energy
  • few MeV loss due to stations
  • Rec. Energy ~ const.
  • Averaged for rec. tracks?

Av. Energy

[MeV]

Black – mc [Virtual Planes]

Green – Trk mc

Blue – Trk reconstructed

summary
Summary
  • TrackerRec/  Station by Station output at present
  • Efficiency 98-99%
  • Position resolution dep. on station
  • At inner station:
  • Energy resolution ~ 4MeV
    • Beyond Landau width- use EMR / ToFs?
  • Amplitude resolution appears < 1mm
  • sDx, Dy~0.7mm
  • sDPx,DPy~ 1 MeV/c
  • sDPz~ 3.7 MeV/c
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