On the Space Charge affected by the Magnetic Field

Abstract

The characteristic phenomena of the dense space charge of electrons bound by the strong magnetic field are described. The electrons in the outermost sheath of electron cloud are considered to be scattered by mutual interaction and to have excess energies.
Calculation based on this view is in good agreement with experiment.
It is especially noteworthy that when the anode voltage is raised to the proper value, this sheath is captured by the anode and certain unique oscillations are observed to occur. The frequencies of these oscillations very nearly coincide with those obtained from Langmuir’s formula of plasma oscillation.