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SMRD optimization studies

SMRD optimization studies. Paweł Przewłocki Warsaw Neutrino Group. The problem. Side Muon Range Detector – measures muon direction and momentum Important for neutrino interactions and cosmic-ray muons (for calibration) We have 15 layers of gaps suitable for scintillator slabs

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SMRD optimization studies

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  1. SMRD optimization studies Paweł Przewłocki Warsaw Neutrino Group

  2. The problem • Side Muon Range Detector – measures muon direction and momentum • Important for neutrino interactions and cosmic-ray muons (for calibration) • We have 15 layers of gaps suitable for scintillator slabs • But the number of slabs is limited. Therefore we have to optimize their configuration in order to maximize our measurement capabilities.

  3. Nd280 off-axis detector – side view Rings: 1 2 3 4 5 6 7 8 15 layers POD TPC TPC TPC

  4. Front view Upper part Left lateral part Right lateral part Bottom part

  5. Our ends… • Cosmic-ray muon considerations – Piotr’s presentation • My area of interest –measurement of muons from neutrino interactions • Muons are mainly measured by TPC – SMRD is important for events that cannot be handled by TPC • Question: what is the optimal SMRD layout to measure muons that cannot be seen in TPC?

  6. …And means • Let’s look at the numbers of the outermost layer reached by muons that are of our interest • The tools: • Geant4 ND280MC simulation • Input: NEUT files on water (for the time being)

  7. Outermost layer in SMRD • 60.000 events from FGD • Energy deposition cut – must have at least 0.5MeV to be a valid hit (I will come back to it later) • TPC distance cut – muon has to travel maximum 60cm in TPC (longer tracks are reconstructed in TPC and don’t need any additional info from SMRD) • „QE” events definition: • One muon • No pizeros • No pipluses over 200MeV in energy • In some cases I split the SMRD into lateral and upper/bottom parts to show the influence of the coil (present only on top and bottom of the basket)

  8. Outermost layer distribution 60cm TPC distance cut applied Red – lateral smrd Black – lateral + upper/bottom Lateral parts are more populated Lateral + upper/bottom Lateral All Lateral + upper/bottom Lateral QE

  9. Outermost layer - upper vs bottom 60cm TPC distance cut applied Only bottom/upper part of smrd Red – bottom smrd Black – upper+bottom Much more tracks go to the bottom part

  10. Some statistics • All: Percentages with respect to all events reaching smrd • QE: percentages with respect to all qe evts reaching smrd

  11. Incoming nu energy distributions Black – all events Red – with 60cm TPC dist cut applied Blue – as above + reaching smrd All QE

  12. Incoming nu energy distributions Black – TPC dist cut + reaching smrd Red – at least 4 layers Blue – at least 5 layers Green – at least 6 layers All QE

  13. Problematic features of the MC DStream ECal FGD POD the pion the hit The pion produced in FGD got caught in downstream Ecal. Three neutrons produced flew in different directions. One went into the SMRD, produced a proton which gave a hit that was attributed by the MC to the pion

  14. Energy deposition in the slabs 0.5MeV cut

  15. Conclusions – proposed module distribution • Work in progress! Preliminary table prepared by Thomas Kutter based on results presented here and some other studies

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