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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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Timothy carlisle oxford

Timothy Carlisle

Oxford

Tracker Reconstruction


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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