Abstract
The kind of electrostatic field in which an electron or ion will follow simple harmonic motion is shown to have a parabolic potential distribution. A gap at the center of this field provides a means for exchange of energy between the electrons and the associated circuit. If energy is taken from the electrons the device provides an oscillator of high efficiency; if energy is given to them the device may be used to generate a high d.c. voltage. Both kinds of device have been operated successfully.Experimental results on a small model of the voltage generator are given and a proposed design for the million-volt range is briefly described.

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