The Design of High-Intensity Muon Channels for a Meson Facility

This paper describes a general computer program which calculates the pion acceptance and emittance spectra together with the muon emittance spectrm for a muon channel composed of any arbitrary arrangement of quadrupole magnets and drift spaces. The calculation procedure does not rely on the thin lens approximation nor does it make any assumtions about the length or periodicity of the structure or about the distribution of particles across the acceptance ellipse. This program was used to evaluate the effects on the pion acceptance and muon emittance spectra of varying the spacing, length and field intensity of the quadrupole magnets, of varying the initial drift distance from the target to the start of the channel and of turning off certain magnets in the channel. The results of these calculations are discussed as they relate to the design of muon channels for a high intensity meson facility.