THz Radiation From a TM₅₁ Mode Sheet Beam Extended Interaction Oscillator With Low Injection

A Highly Overmoded Structure for Hundred-Kilowatt-Class Ka-Band Extended Interaction Klystron

“…where Q0 and Qe are the intrinsic quality factor and externally loaded quality factor, respectively. Qb is beam-loaded quality factor, defined as 26 1…”

“…23 Currently, various highorder mode structures and innovative structures designed by combining multi-beam and sheet-beam have been widely studied. [24][25][26][27][28][29][30] Multi-beam technology and coaxial structure have been widely used in conventional high-power klystrons. 31 When maintaining the same current density as the traditional single beam, multiple beams can provide a larger total current for the high-frequency structure in a large cross-sectional area.…”

Study of an overmoded structure for megawatt Ka-band extended interaction klystron

“…The power limitation imposed by crosssectional dimensions which shrink with wavelength can be overcome by using cavities and waveguides that are much larger than the wavelength in the transverse dimension due to operation in higher-order modes. [22][23][24][25][26][27][28][29] By realizing the method of concentrating the axial field energy along the source's central axis within a large cavity, an oversized beam tunnel that can support efficient energy conversion between the intense electron beam and the high frequency field is designed. This overmoded structure has a far larger electron beam loading area than conventional structures.…”