Low energy ν-beam for EUROSB Marcos Dracos, Nikos Vassilopoulos IPHC Strasbourg, IN2P3/CNRS.

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Presentation transcript:

Low energy ν-beam for EUROSB Marcos Dracos, Nikos Vassilopoulos IPHC Strasbourg, IN2P3/CNRS

ν-storm 26/3/2013 CERN Aim is to use the low energy μ-beam to produce ν s with with = 300 MeV in order to measure their cross section Study a target-horn system optimized for 5 GeV/c focusing (initiated by Sergei’s talk on 18/3/2013 meeting + ν-storm papers) Also look at the GeV/c π + - production-focusing Beam: protons E = 60 GeV, σ x = σ y = 0.1 cm Target: graphite, L = 95 cm, r = 0.3 cm, d = 1.81 gr/cm 2 Horn, Aluminum thickness = 0.3 cm, 5 GeV/c focusing, (horn shape as NIM A 383 (1996) , CNRS Technical Report) MC: FLUKA /latest + Flair interface

Lower ν-energies for ESS & SPL SBs ν-storm 26/3/2013 CERN ν-storm

Low Energy  beam 4 Alan Bross Intensity Frontier Neutrino Subgroup WS - SLAC March 7, 2013 After 3.48m Fe, we have   /pulse in 100 < P(MeV/c) < 300 At end of straight we have a lot of  s, but also a lot of  s with 4.5 < P(GeV/c) < 5.5 Decay pipe

5 GeV/c π + angular distribution at target ν-storm 26/3/2013 CERN 90 % of π 100 mrad Design a horn with 100 mrad acceptance for 5 GeV/c pions

Horn 5 GeV/c, 100 mrad focusing ν-storm 26/3/2013 CERN L = 1.5 m, R neck = 1.5 cm, R out > 10 cm, aluminum thickness = 0.3 cm, 100 mrad 5 GeV λ upstream plate R =10 cm 100 mrad ray 10 mrad ray

ν-storm 26/3/2013 CERN π + yield vs theta with respect to horn’s r < 20cm 0-2 GeV/c 4-6 GeV/c π + yield vs target’s exit Horn II

Results/further thoughts GeV/c r < 20 cm5 ± 0.5 GeV/c r < 20 cm4 - 6 GeV/c ν-storm 26/3/2013 CERN π + per proton at horn’s exit After focusing most of 5 GeV π + have less than 20 mrad angle with respect to the beam-axis while wider angle for 0-2 GeV/C Thanks Could we use the low energy μ-beam modified to our needs for the low ν- energy SBs with = 300 MeV ? Now an idea … Studies are needed…

π + spectra at target exit ν-storm 26/3/2013 CERN