A Crossed Field Velocity Analyzer for Plasma Ions

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Abstract
A crossed electric and magnetic field analyzer has been developed to select ions of a given mi/q ratio and record their velocity distribution. The initial velocities of the ions are mainly directed along the magnetic field of the analyzer; the detection is performed in a plane perpendicular to it. The ion optical properties of the analyzing structure and its sensitivity to space charge effects are illustrated by the synoptical recordings of the velocity distributions of protons leaving a conical theta pinch plasma accelerator. The velocity spectrogram appeared on an ion sensitive plate positioned in the detection plane, showing a series of well focused images of the inlet. In some cases, the particle density in the proton beam could be deduced from the features of the spectrogram.

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