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Fluxes and timing in the CNGS muon pits A. Ferrari P. Sala

Fluxes and timing in the CNGS muon pits A. Ferrari P. Sala. Geometry. BLMs. Here: pit1. (pit2 is the same) . Approximated layout of detectors: ( the timing results are not affected by 2 nd order details) supports: 3 mm Al plates, in front and behind diamonds

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Fluxes and timing in the CNGS muon pits A. Ferrari P. Sala

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  1. Fluxes and timing in the CNGS muon pitsA. FerrariP. Sala

  2. Geometry BLMs • Here: pit1. (pit2 is the same) . Approximated layout of detectors: • ( the timing results are not affected by 2nd order details) • supports: 3 mm Al plates, in front and behind diamonds • Detectors: 100μm C density 3.52 • Two positions : • Detector1 at 10 cm from the pit entrance wall, • Detector2 just before the BLMs Detector 1 Concrete Detector 2 beam Beam dump Air of pit 1 325 cm 5 m

  3. Spectra in 1st pit Lethargy spectra of muons and background particles Dominant bg: electrons and photons

  4. Spectra in pit 2 Pit 2, same structure. Backgr. Is regenerated by muons ( hadrons and neutrons via photonuclear reactions)

  5. MUONS spatial distributions pit1 pit2

  6. Electron spatial distr. pit1 pit2

  7. Photon spatial distribution pit1 pit2

  8. Pit 1 (det 1): energy dep. vs time Log-y scale! Full range : 250 ns Position of small secondary peaks consistent with reflections in the pit

  9. Pit 1 (det 2): energy dep. vs time Log-y scale! Full range : 250 ns

  10. Pit 1 (det 2): energy dep. vs time Extended time interval Full range :5 μ s

  11. Pit 2 (det 1): energy dep. vs time Log-y scale! Full range : 250 ns

  12. Pit 2 (det 2): energy dep. vs time Log-y scale! Full range : 250 ns

  13. Pit 1: det 1 vsdet 2 Each x-axis division is 5 ns long

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