On super high-energy intense neutrino beam shaping

Results of calculating a focusing system for a neutrino channel are presented. The system consists of two lithium lenses and a symmetrical triplet of quadrupole lenses. Optimization calculations showed that parameters of lithium lenses No.1 and No.2 should constitute respectively: the length 20 and 18 cm, the radius 1.4 and 2.8 cm and the current 500 and 630 kA. The triplet of quadrupole lenses consists of lenses with gradients of 1300 Oe/cm, a length of 2 m (the outer ones) and 4 m (the central one), and an aperture of 20 cm. Angular envelopes of particle beams at the output of the combined system and system comprising axially symmetrical elements are given. A marked effect in the envelope behaviour is observed in the region of great particle momenta. In using both the combined and the axially symmetrical systems the neutrino and antineutrino spectra coincide throughout the momentum range with increasing the neutrino and antineutrino flux 3 times and more. The integrated flux of background particles when the combined system is used is 1.6 times higher