EXTENDED INTERACTION DEVICE COMPRISING COAXIAL RESONANT CAVITIES AND MULTIPLE ELECTRON BEAMS

Abstract

A millimeter-wave extended interaction device, including: a device body; resonant cavities; electron beam tunnels; an output waveguide; and a coupling hole. The device body includes a shell and a core, and an annular coupling channel is disposed between the shell and the core. The resonant cavities are a set of ring-shaped cavities with a radial height of 2 /5 , to 3/5 , parallel and equally spaced around an axis of the core. The electron beam tunnels are arranged at equal radian intervals and parallel to the axis of the core. The output waveguide is disposed in the middle of the shell and communicates with the annular coupling channel through a coupling hole. The core and the inner surface of the shell are sealed and fixed, and the output waveguide and the shell are sealed and fixed.

Claims

1. A millimeter-wave extended interaction device, comprising: a device body; resonant cavities; electron beam tunnels; an output waveguide; and a coupling hole; wherein the device body comprises a shell and a core, and an annular coupling channel is disposed between the shell and the core; the resonant cavities are a set of ring-shaped cavities with a radial height of 2 /5 to 3/5 , parallel and equally spaced around an axis of the core; the electron beam tunnels are arranged at equal radian intervals and parallel to the axis of the core, each electron beam tunnel communicating with the ring-shaped resonant cavities and passing through two end walls of the core; the output waveguide is disposed in a middle of the shell and communicates with the annular coupling channel through a coupling hole; and the core and an inner surface of the shell are sealed and fixed, and the output waveguide and the shell are sealed and fixed.

2. The device of claim 1, wherein a radial height of the coupling channel is in the range from /10 to /5, and an axial width thereof is equal to a distance between outer walls of the resonant cavities at front and rear ends.

3. The device of claim 1, wherein a cavity number of the ring-shaped cavities ranges from 5 to 19, and a width of the ring-shaped resonant cavities along an axial direction of the core is related to operating voltage; when the operating voltage is 5-40 kV, the width of the resonant cavities is 0.15-5 mm.

4. The device of claim 1, wherein a number of the electron beam tunnels is 5-20 and a diameter of each tunnel is /7 to /5; a space between two adjacent electron beam tunnels is 1-3 times a diameter of an electron beam tunnel.

5. The device of claim 1, wherein the coupling hole is rectangular or circular.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a schematic drawing of a millimeter-wave extended interaction device according to one embodiment of the invention;

[0011] FIG. 2 is a cutaway view taken from line II-II in FIG. 1.

[0012] FIG. 3 is a cutaway view taken from line IV-IV in FIG. 1.

[0013] FIG. 4 is a part cutaway view of a millimeter-wave extended interaction device according to one embodiment of the invention.

[0014] In the drawings, the following reference numbers are used: 1: Core, 2: Shell, 3: Electron beam tunnel, 4: Ring-shaped resonant cavity, 5: Annular coupling channel, 6: Coupling hole, 7: Output waveguide.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The implementation method takes a 94 GHz (the corresponding operating wavelength is about 3.2 mm) EID operated in fundamental mode (TM.sub.010 mode) at the operating voltage of 20 kV for example.

[0016] As shown in FIGS. 1-4, the nominal diameter and the axial length of the core 1 are 8.7 mm and 8.0 mm respectively. The nominal size of the shell 2 is as follows: the diameter of 8.7 mm, the outer diameter of 12 mm, and the axial length of 8.0 mm. The material is oxygen free copper. This method sets 7 ring-shaped resonant cavities 4 in the core 1. The inner and outer radius of each ring-shaped resonant cavity is 2.4 mm and 4.0 mm (the radial height of the resonant cavity is 212) respectively. The axial width of each ring-shaped resonant cavity is 0.40 mm and the space between two adjacent resonant cavities is 0.52 mm. The axial length of the annular coupling channel 5 is 5.92 mm and its inner, outer radius is 4.0 mm, 4.35 mm respectively. Namely, the radial gap of the annular coupling channel is 0.35 mm. In the central lines of the ring-shaped resonant cavities 4 place 16 electron beam tunnels with the diameter of 0.5 mm which are arranged at equal radian intervals and pass through the core 1. On the shell 2 locates the output waveguide 7 and the coupling hole 6, the distance between the central lines of which and the core 1 is 4.0 mm. Among, the output waveguide 7 is a standard W-band rectangular waveguide and the coupling hole 6 is a circular hole with the diameter of 0.85 mm.

[0017] This method was implemented by simulation tests. The operating frequency is 94 GHz when the device operates in fundamental mode at 20 kV. The total beam current of 16 electron beam tunnels obtains 16 A, each beam tunnel 3 having current of 1.0 A.

[0018] The input beam power of the device is 320 kW and the output microwave power over 16.5 kW can be achieved. The output efficiency is about 5.15%.

[0019] Unless otherwise indicated, the numerical ranges involved in the invention include the end values. While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.