High-Resolution Magnetic Spectrometer

Abstract
A 180° point‐focusing magnetic spectrometer was constructed for high resolution analysis of the momentum distribution of protons up to 2 Mev in energy. Mechanical adjustments of the poles enabled the field shape to be empirically adjusted for minimum radial aberration in the focal plane. The aperture is 0.0025 steradian, and the momentum resolution is better than 2000.