W-band Single-Anode MIG for Gyro-TWT

A coherent microwave and millimeter wave generation from fast-wave gyro-devices are attractive due to their high power handing capability. They have many applications such as plasma generation and heating, high gradient particle accelerators, and material processing. In the fast-wave gyro-devices, since the beam-wave interaction takes place between a transverse electric field of a guided wave and an electron transverse momentum, producing a high quality gyrating electron beam with a low velocity spread is a critical issue in the design of high performance gyro-devices. Different types of electron guns producing the gyrating electron beam with a large transverse momentum have been studied in many countries. The double-anode and single-anode magnetron-injection-guns (MIG) are commonly used. Due to the mechanical complexity of the double-anode MIG , however, the single-anode MIG which does not include the modulating anode seems attractive for use in practical devices. This paper describes studying on a single-anode MIG which produce a high quality gyrating electron beam. The design is based on analytic trade-off equations. And computer simulation uses the electron trajectory code-EGUN. The electron gun is used for a W-band, TE ₀₁ gyro-TWT amplifier which required to producing a small orbit electron beam