Continuous extracted beam in the AGS fast external beam line

A method to split off a few percent of the 6x10/sup /spl and//13 AGS beam delivered to the slow external beam (SEB) lines and send it down the fast external beam line (FEB) has been developed. The mission is to feed a counter experiment off the FEB that directly measures the neutrino mass using the muon storage ring. The use of normal thin septum splitters would have an excessive loss overhead and been optically difficult. The AGS slow extraction uses a third integer resonance with sextupole strength so the resonance width is a few percent of the beam width. This results in a low density tail which will be clipped by a bent crystal and deflected into the FEB channel. This clipping off of the tail should reduce losses in the SEB transport line. Details of modelled orbits, particle distribution and extraction trajectories into and out off the crystal will be given.