Simulation Theodore Tomalty Thursday July 18, 2013 1 Muon hit to - - PowerPoint PPT Presentation

Simulation

Theodore Tomalty Thursday July 18, 2013

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Muon hit to truth trajectory matching

• First step in:
• Tracking algorithm (which we will need to find a reasonable

minimum energy for each strip/wire)

• Study of muon multiple scattering (how well the muons follow a

straight line)

• Muon position is measured by taking the average of the strip/wire

position weighted by their respective energy levels.

• x = (StripEnergy[0] * StripPosition[0] + ... + StripEnergy[19] * StripPosition[19]) /

(StripEnergy[0] + ... + StripEnergy[20])

• y = (WireEnergy[0] * WirePosition[0] + ... + WireEnergy[19] * WirePosition[19]) /

(WireEnergy[0] + ... + WireEnergy[20])

• The measured position is compared to the theoretical position, that

is determined by the initial position and momentum given by Geant.

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Strip Width = 40mm | Wire Spacing = 40mm

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Stopping Power of Lead Layer

• The lead layer is placed just above the bottom scintillator to stop
• ncoming low-energy muons.
• These plots show the ratio of muons that hit the bottom

scintillator to the ones that should have hit it (based on initial information) for each muon energy level.

• Registered hits were required to have a minimum energy of

1MeV to prevent scattered electrons from being counted as a hit.

• These will be used to chose a lead thickness if any based on the

results of the muon multiple scattering analysis.

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10cm 14cm 19cm 14cm 14cm 14cm 21cm

Fraction of events depositing energy in bottom scintillator Fraction of events depositing energy in bottom scintillator Fraction of events depositing energy in bottom scintillator Fraction of events depositing energy in bottom scintillator Muon initial kinetic energy [MeV] Muon initial kinetic energy [MeV] Muon initial kinetic energy [MeV] Muon initial kinetic energy [MeV]

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