Abstract

A double focusing zero dispersion magnetic spectrometer has been constructed having the following properties:The spectrometer consists of two magnets, each n≅0.25, 110° deflection, 30-in. radius of curvature, bending the particles in the same sense. For the central momentum p0, the useful solid angle Ω0 is ∼0.0055 sr with a possibility of improvement to 0.01 sr. The momentum acceptance Δp is in excess of ±4% with a useful solid angle Ω of ∼0.0015 sr at the 4% points. For a point source and for the solid angles and momentum acceptances given, over 90% of the trajectories terminate within a circle of 2-in. diameter at the focal plane.

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