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Abstract
The presence of the additional transverse or longitudinal magnetic field component (Bv or Bz) in the gun region has been earlier reported to result in a significant reduction of noise in an injected-beam crossed-field device, without any significant deterioration in beam transmission. The additional magnetic field component is present throughout the gun region. Some theoretical work on the beam formation and noise transport does not seem to indicate the reduction in noise as observed experimentally.
Experimental results carried out on crossed-field beam analyzers with titled cathodes also result in a significant reduction in noise without any significant deterioration of beam transmission. The function of the tilt seems somewhat similar to that in a magnetron injection gun. This indicates some modification of the noise phenomenon originating at the cathode due to the presence of an additional magnetic field component resulting from either cathode tilt or arising externally.