Abstract
A simple device for producing a high-band neutrino beam is proposed; it consists of a quasi-parabolic profile magnetic horn followed by a narrow circular slit. As an example evaluations are carried out for the West Hall neutrino beam proposed at the CERN SPS, for a primary proton energy E 0 = 400 GeV. The collimation of the resulting parent hadron beam is excellent, giving a spot of ≈ 40 cm maximum radius at the hadron filter, with a very tenuous halo. The overall attenuation of the event rate with respect to the ideally focussed neutrino beam production is ≈ 65%, entirely due to the partial suppression of the low energy neutrinos (E ν ≲ 1 3 E 0) .
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