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Update on Shintake Background Simulation: Insights from Hayg Guler & Marc Verderi (Oct 14, 2009)

This update presents insights into the Shintake detector model's background simulation, focusing on geometry and response characteristics. The model features four 10 mm thick CsI layers and three long CsI blocks, evaluating photon and neutron contributions to background via simulated 30 MeV photon shoots. We explore the placement of the Shintake detector relative to the beam dump and discuss the challenges faced, including processing emitted electrons and potential biases in simulation results. Further discussions cover options for enhanced background statistics and methods for optimizing simulations.

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Update on Shintake Background Simulation: Insights from Hayg Guler & Marc Verderi (Oct 14, 2009)

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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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