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Near Detector Flux and R&D

Near Detector Flux and R&D. International Scoping Study Meeting 27 April 2005 Paul Soler University of Glasgow. Neutrino Factory Beams. Neutrino beams from decay of muons:. Polarisation dependence. Spectra at Production (e.g. for 50 GeV muons). Number CC interactions.

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Near Detector Flux and R&D

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  1. Near Detector Flux and R&D International Scoping Study Meeting 27 April 2005 Paul Soler University of Glasgow

  2. Neutrino Factory Beams • Neutrino beams from decay of muons: Polarisation dependence Spectra at Production (e.g. for 50 GeV muons) Number CC interactions 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  3. Near detector beam flux • Near detectors should be able to measure flux and energy of and • Calibration and flux control (see Blondel talk): • Event rates at near detector (McFarland) leading to far detector rates: • Try and develop beam simulations to reproduce these results E.g. at 25 GeV, number neutrino interactions per year: 20 x 106 in 100 g per cm2 area. 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  4. shielding the charm and DIS detector Cherenkov Polarimeter the leptonic detector storage ring Near detector beam flux • Near detector(s) are some distance (d~30-1000 m) from the end of straight section of the muon storage ring. • Muons decay at different points of straight section: near detector is sampling a different distribution of neutrinos to what is being seen by the far detector d 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  5. shielding the charm and DIS detector Cherenkov Polarimeter the leptonic detector storage ring Near detector beam flux • Different far detector baselines: • 730 km, 20 m detector: q~30 mrad • 2500 km, 20 m detector: q~8 mrad • 7500 km: 20 m detector: q~3 mrad • If decay straight is L=100m and d =100 m, neutrinos are generated between 30-130 m from detector. E.g. at 8 mrad, lateral displacement of neutrinos is 0.25-1.0mm to subtend same angle. d 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  6. shielding the charm and DIS detector Cherenkov Polarimeter the leptonic detector storage ring Near detector beam flux • I have inherited some neutrino factory beam, event generator and detector code from A. Cervera and JJ Gomez (Thank you!) • It needs o be adapted to generate events at a near detector • At the moment events are generated from a point neutrino source. • Need to implement decays along straight decay sections • Only looked at fluxes and number of events expected in detectors • Can observe energy shift as a function of distance d 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  7. Near detector beam flux d=30 m, r=0.5 m d=130 m, r=0.5 m d=1km, r=0.5 m Flux Anti-nm 34.1 GeV 21.6 GeV 17.8 GeV ne 18.5GeV 29.2 GeV 15.3 GeV 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  8. Near detector event rates d=30 m, r=0.5 m d=130 m, r=0.5 m d=1km, r=0.5 m Event rates Anti-nm 37.1 GeV 25.5 GeV 26.6 GeV ne 32.5 GeV 22.3 GeV 23.2 GeV 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  9. Far detector flux and event rates d=2500 km, r=20 m Event rates 35.8 GeV Anti-nm 38.1 GeV 30.0 GeV 33.3 GeV ne 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  10. Far detector flux and event rates Sofia group are implementinmg full decay along straight sections (500 m) with Polarities +1: Roumen Tsenov, Yordan Karadzhov 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  11. Far detector flux and event rates Sofia group are implementinmg full decay along straight sections (500 m) with Polarities -1: Roumen Tsenov, Yordan Karadzhov 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  12. Far detector flux and event rates Sofia group are implementinmg full decay along straight sections (500 m) with Polarities +-1: Roumen Tsenov, Yordan Karadzhov 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  13. Far detector flux and event rates Sofia group are implementinmg full decay along straight sections (500 m) with Polarities +-1: Roumen Tsenov, Yordan Karadzhov 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

  14. Plans • We are now getting the beam simulations in place. Need to implement proper decays along straight sections • Need to implement detectors into the beam simulations, and interface to neutrino generators (Genie, home grown?) • Already beam simulations show that you need good granularity in near detector to be able to obtain fluxes that are relevant for far detector and to minimise systematics (plot in radial bins). • Good granularity would imply something like a silicon pixel/strip detector or emulsion to achieve good vertexing and accurate divergence (can emulsion handle the rate??) • DEPFET, Monolithic Active Pixels, Hybrid pixel detectors could do job: detector R&D ….. • Need more manpower 3rd International Scoping Study Meeting Rutherford Appleton Laboratory

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