Development of electron-optical system with three elliptic electron beams for a THz-band vacuum-tube device

Electron-Optic System With High Compression of a Multiple Elliptic Electron Beam for a Miniaturized THz-Band Vacuum Electron Device

“…7 demonstrates the electron current density profile in the midplane x=0 calculated at 1.48 g V  kV. At that voltage, the current of each beamlet is 62 mA that is almost two times higher than in the previous works [13] and [14]. Thus, the averaged current density at the cathode is 26.31 A/cm 2 .…”

“…The elliptic shape is preferable to circular one because it provides less current interception at the anode. To increase the beam current, vertical dimension of the protrusions was increased in comparison with the gun developed in [13], [14]. Distance of 0.2 mm between the cathodes in y-direction has been selected to get 0.8-mm distance between the beamlet axes.…”

“…In [13] and [14], we presented the EOS with 6.5-times compression of triple elliptic electron beam for a 0.2-THz traveling-wave tube (TWT). The triode electron gun with a magnetically shielded cathode has been developed and 3×0.031 A current, i.e., 93-mA total current has been measured.…”

“…In this article, we improve the design presented in [13], [14] in order to increase the beam current and to reduce the cathode loading. The new EOS produces a 3×0.06 A ellipticshaped electron beam.…”