Recent studies on the space−charge−limited reflex vacuum triode pulsed ion accelerator show a marked improvement in the output parameters and efficiency of the device. In the current machine, a 50−nsec pulse of 130−keV protons of 6000 A is produced at a current density of 20 A/cm2. Energies up to 300 keV have been investigated. The troide efficiency, defined as proton energy output versus total energy input, has been raised from 10 to 42 by the addition of magnetic fields that prevent anomalous electron loss in the fringing fields at the edges of the electrodes. Time−of−flight measurements confirmed the peak energies. The beam was measured to have about a 10 ° half−angle of spread. The results obtained indicate that the accelerator may be scaled to the ranges of parameters currently achieved by pulsed electron accelerators.
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