Electrical engineering

Physics

Cavity magnetron

Traveling-wave tube

Electron

Transverse plane

Nanotechnology

CMOS

Common emitter

Laser

Structural engineering

Optics

Laser beam quality

Engineering

Beam (structure)

Electron gun

Amplifier

Thin film

Materials science

Sputtering

Cathode

Quantum mechanics

Diode

Laser beams

Optoelectronics

Cathode ray

IEEE Transactions on Electron Devices

A diode magnetron injection gun (MIG) has been designed and analyzed for G-band gyro-traveling wave tube (Gyro-TWT). A novel curved surface emitter is proposed to enhance the beam quality. An electron beam with velocity ratio of 1.20 and transverse velocity spread of 2.11% is obtained. The beam transportation stability with geometry misalignment is also analyzed, and the assembly accuracy should be controlled under 0.1 mm. The stray electron is intercepted by the capture structure to avoid the bombardment to the interaction circuit. Then the cathode is fabricated, and the temperature distribution is measured. The experimental result matches well with the simulation. The electron beam quality considering expansion, surface roughness, and thermal emission is estimated, and the total transverse velocity spread is about 2.63%.

Design and Analysis of a Diode Magnetron Injection Gun for a G-Band Gyro-TWT