A High Flux Muon Channel Incorporating a High Quality Spectrometer Field

In a previous paper the author presented properties of a three-coil channel that would have an acceptance > 1 sr within a momentum band of a few percent for muons produced in or near a thick production target. In this paper we present an extension of that design concept: a fourth coil is added in a Helmholz configuration with respect to the third coil to produce a large volume of uniform magnetic field suitable for the incorporation of any spectrometer (such as a time projection chamber) that tracks the paths of particles. Details of an example system are presented.