Developing of EOS Model with Elliptical Beams for THz Devices

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

“…Thus, the averaged current density at the cathode is 26.31 A/cm 2 . Despite it is higher than the values reported in [12]- [14] where the cathode loading about 20 A/cm 2 was measured, it still seems available for the existing thermionic cathodes. At the entrance of the beam tunnel, the beamlets have nearly elliptic shape with approximately 75 m×250 m dimensions.…”

“…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.…”