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Update on shintake background simulation

Update on shintake background simulation. Hayg Guler Marc Verderi 14 th october , 2009 LLR – Ecole polytechnique. Shintake detector model. Geometry: 4 CsI layers, 10 mm thick 50 mm high 100 mm wide 3 CsI blocks, 30 cm long Correct ?

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Update on shintake background simulation

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  1. Update on shintake background simulation HaygGuler Marc Verderi 14thoctober, 2009 LLR – Ecolepolytechnique

  2. Shintake detector model • Geometry: • 4 CsI layers, 10 mm thick • 50 mm high • 100 mm wide • 3 CsI blocks, 30 cm long • Correct ? • In the following 4 front layers are labeled 1 to 4, the 3 CsI blocks are grouped all together to form “layer #5”

  3. Check of simulated Shintake detector response • Shoot: • Monochromatic 30 MeV photons • To mimic the “signal” photons • Exponentially decaying spectrum • To mimic Brem photons • Plot related energy deposit profiles

  4. Beam dump model Detail of central/copper part

  5. Beam dump + Shintake detector(view from top) • Place (roughly) the Shintake detector with respect to the beam dump • No shielding nor collimators placed here, but doable (models exist). • Note that only a macro file is used to place these beam dump and Shintake detector models

  6. Same with 50 1.3 GeV e- in dump • Left picture is obtained by shooting 50 electrons in dump. • Leading background are • photons, back shined from dump (not in Shintake detector direction) • Neutrons (“brownian” aspect tracks) • Difficulty: • Processing 10K electrons lead to only one deposit in the Shintake

  7. Next • Simulate the end line with BDSIM • Merge our “standalone” simulation with BDSIM • Consider to bias the simulation • Low statistics in simulation is expected for background from dump • But will be likely the same with the BDSIM for EM background • Options (not mutually excluding) • Geometry biasing in dump • Physics biasing elsewhere • we started to investigate how we could bias the Geant4 brem process to enhance production towards detector direction(s).

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