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Experimental set up. (1) Cylindrical cathode; (2) Cu anode holder; (3) central and shifted from the central axis holes in the anode holder; (4) collector; (5) Al foil.
Waveforms of the diode voltage and RAE current behind the anode for cylindrical cathode. Diameter of the central hole and thickness of the anodeholder are, respectively, (a) 6.5 mm and0.25 mm, dCA = 12 mm; (b) 0.5 mm and 0.25 mm, dCA = 8 mm; (c)0.5 mm and 0.25 mm, dCA = 8 mm; (d) 1 mm and 5 mm, dCA = 8 mm.
Time evolution of the RAE current passing through the anode obtained in 1D PIC simulations for a given experimental voltage for dCA of 6 mm (a) and 12 mm (b).
Electron bunch propagation in the vacuum diode: dCA = 8 mm; dH = 0.5 mm; and h = 5 mm.
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