The%20Double%20Chooz%20Monte%20Carlo%20(selected%20topics%20!)

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The Double Chooz Monte Carlo(selected topics !)

• Dario Motta (Irfu/SPP)
• Anatael Cabrera (APC)

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Performance
Detector Monte Carlo
Backgrounds
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The Double Chooz Monte Carlo
Geant4-based, detailed detector description,
however several extensions

• Scintillation and optical model
• PMT geometry and optics
• Read-out System simulation
• User-friendly interfaces for event generation
• Data-Base handling

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Optical model light attenuation
Target scintillator

• Partial attenuation lengths calculated by using
• Molecular extinction coefficients (DC
  spectrophotometric measurements)
• Concentrations in the mixture

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Optical model wavelength-shift

• Partial re-emission probabilities calculated by
  using
• Partial att. length (see above) to get the
  partial absorption probabilities
• Molecular re-emission yields (from literature
  and fluorimetric measurements)

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Optics of an absorbing thin filmThe experimental
input for the model
(D. Motta S. Schönert, NIMA 539 (2005), pp.
217-235)
photocathode thickness, which is quite typical
20 - 30 nm
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PMT Model

• A(q,l) R(q,l) and T(q,l) calculated for any
  impinging photons QE(q,l)medium QE(0,l)air x
  A(q,l)/A(0,l)air ? QE/A const

Relevant QE
Measured QE
Calculated
Assumed
l 410 nm
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Thank you !
Yes, this is the end