Abstract
The paper describes a method of calculating space-charge fluctuations (noise) in a simple crossed-field system called a ‘ symmetrical magnetic diode ’. It is shown that moderately high frequency noise can be either reduced or enhanced in such a system, depending on the relative influence of electric and magnetic fields on the electron trajectories. The electric field has a tendency to reduce noise, just as in the case of an ordinary space-charge-limited diode, but the magnetic field appears to enhance noise. The analysis is based on the use of random functions as a mathematical model for fluctuations of the electron cloud generated by thermionic emission.
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