A Neutrino Horn Based on a Solenoid Lens
نویسندگان
چکیده
This note considers variations on the theme of a solenoid magnet (i.e., a magnet whose field has axial symmetry) as a lens for charged particles. A related problem has been posed in [1]. Recall that if a device is to be a lens with optic axis along the z axis in a cylindrical coordinate system (r, φ, z), then as particles leave the device they must have no azimuthal momentum, Pφ = 0, and their radial momentum must be proportional to their radial coordinate, Pr ∝ r. Special cases are (1) that all particles have r = 0 at the exit of the device, which is a focal point; and (2) that all particles have zero radial momentum.
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