Ion-acceleration mechanisms in vacuum diodes

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Abstract
A study of proton acceleration in a Luce diode has been carried out. Measurements of beam‐neutralization times, electron and ion energy distributions, and induced radioactivity have been made. These measurements show that the effective potential‐well depth at the beam head is less than the electron‐accelerating voltage. Also, the relative activity of Mylar and copper foils indicates that ion energy increases with mass for Z=1 particles. Both of these observations are consistent with ion acceleration resulting from a moving potential well.