M13 is a low energy pion/muon beamline, taking particles from 1AT1, and having a good final spot, but lower rate and less versatility than M20 or M15. When used for µSR, M13 is fitted with a small beam separator and an extra quadrupole triplet which give a fairly positron-free muon beam but only with longitudinal polarization.

The TRIUMF µSR Facility msrorg@triumf.ca