P2-19: Design of dual anode electron gun and beam focusing for Ku-band 140W short length space TWT

A dual anode electron gun has been designed using EGUN and TRAK codes for Ku-band 140 W short length space Traveling Wave Tube (TWT). Pierce type electron gun with an electrically isolated beam forming electrode (BFE), a control anode and an ion barrier anode (A₀) in addition to ground has been opted. Due considerations have been given in the design of gun assembly to ensure the long life (>10 years) and high reliability. A PPM circuit with confined beam flow focusing has also been designed with Sm₂Co₁₇ magnets using in-house developed code MAGFLD. A good beam laminarity and beam ripples (<;5%) have been obtained. An electron gun assembly has been designed and developed with due considerations for high voltage and thermal considerations from space TWT point of view.