A magnetic spectrometer with gradient field

The main features are described of a spectrometer which is being assembled for nuclear research in Oxford. It is unusual in that the main 100° analysing magnet whilst of 'picture frame' form also provides a wide aperture of gradient field. Advantages are a larger dispersion for a given overall size and bending radius, with the possibility of a normal incidence focal plane without serious detriment to resolution. Magnetic field measurements to date are presented and indicate good volumes of field with low remanent effects. Small modifications to the entry and exit boundaries are currently being assessed.