Abstract
The targets and probes will be introduced 6-inches below the median plane so that adequate mechanical support can be effectively utilized without reducing the aperture. Probe heads will be of such configuration as to allow monitoring of any desired vertical strip of the aperture. It is probable that some space will be available in the quadrants after first performance tests have been on the machine. No targets or probes will be located in that 1-foot x 4-foot aperture initially. Provision will be made for driving the inner radius targets on the west tangent tank into the aperture during acceleration. The drive mechanism will locate the target (within an adjustable radius) in 1/2 a second. Because of the asymmetry in geometry of pole tip magnets with respect to the magnet yokes and the curvature of the quadrants, it will be difficult to remove positive charged meson beams. A re-entrant side plate on the inside radius of the west tangent tank is under study. While such a plate would provide a location for bending magnets and collimators for positive particles and would simplify the construction of some beam monitoring probes, its presence may introduce a first harmonic distortion in the magnet field of a prohibitive amplitude.
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