Helical corrugation of the inner surface of an oversized circular waveguide provides very flexible dispersion characteristic of an eigenwave. Under certain corrugation parameters, the eigenwave can possess a sufficiently high and almost constant group velocity over a wide frequency band in the region of close-to-zero axial wavenumber. This makes it attractive for broadband gyro-TWTs and gyro-BWOs with reduced sensitivity to electron velocity spread. Another set of parameters ensures an operating wave with a strong frequency dependant group velocity over a frequency band, which is sufficiently separated from any cutoffs. Such wave dispersion is favourable for frequency-chirped pulse compression at very high power levels. An overview of experiments on the helical-waveguide gyro-devices and the pulse compressor is presented.
|Name||NATO science series, series II: mathematics, physics and chemistry|
|Conference||NATO Advanced Research Workshop on Quasi-Optical Control of Intense Microwave Transmission |
|Period||14/02/04 → 17/02/04|
- gyrotron-type devices
- waveguide with helical corrugation
- microwave pulse compression