A new expression for the resolution of a uniform magnetic field analyser

The resolving power is characteristic of the quality of the analysis of an ion beam in a magnetic sector; it can be expressed as function of the angle of deflection of the sector, of the position and the amplitude of the maximum radial extension of the beam in the sector and of its emittance. imum configuration can be deduced, defined by a symmetry of the beam in the sector with respect to the half-angle of the deflection.