  The design and performance analysis of DC electron gun for 5045 S-band
klystron has been worked out using SLAC beam trajectory program (EGUN) and
Computer Simulation Technology Particle Studio (CST-PS), Codes. Specifications
of electron gun were focused on beam; current, perveance, size and emittance.
Optimized beam; current, perveance, diameter and emittance were 414.00A,
2.00uP, 26.82 mm and 103.10 pi mm mrad, respectively. Furthermore, the
optimized characteristic parameters of the gun were also calculated and
compared with the simulated and experimental values which were in agreement.
Accuracy of simulation was verified by comparison of emitted beam current which
has error of zero percent.
