Reduction of energy dispersion on a parabola mass spectrometer

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Abstract

The particle flux density at the mass spectrometer Lohengrin can be significantly increased if a portion of 40 cm along its parabola, corresponding to ±2.7% of the central energy value, is focused by using a dipole magnet with a shaped exit face. This device compensates the momentum dispersion of the first magnet and the energy dispersion of the electric field, increasing up to a factor of 7 the particle flux at the new focal position and diminishing the background from ions which underwent charge exchange collision and scattering in the spectrometer. Thus more accurate studies of rare fission events and the determination of exotic nuclei characteristics will become possible.

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