JPS60195840A - Gyrotron oscillation tube - Google Patents

Abstract

PURPOSE:To enable a collector to be independent from a waveguide passage by providing an electric wave reflector between an electron beam collector and a resonance cavity in order to transfer the electric wave. CONSTITUTION:Supposing that a figure of an electromagnetic wave generated in a resonance cavity 4 is TEon provided that (n) is a positive integral number, the conversion into the linear poralization as well as the conversion of the electric wave advance direction is performed generally by cutting an opening of a cylindrical waveguide tube part 8 obliquely while joining it together with a reflector 9 having a reflection face tangential to a parabolic column. In the case shown by the figure, the electric wave advances in the direction of the output tubes 10 and 7. An electron beam is guided by a magnetic field generated by means of a magnetic field generation coil 3c so as to be advanced without colliding with the members 8 and 9 for being collected by an electron beam collector with an expanded heat receiving area widened in a horn shape. Further, not only the reflector having the reflection face tangential to the parabolic column but also the reflection face tangential to the ellipsoidal column can be used for the refelctor 9, whereby the focusing effect of the electromagnetic wave beam of the linear polarization can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a gyrotron oscillator tube that generates EHF radio waves.

[Prior art and its problems]

The configuration of a conventional gyrotron oscillation tube is shown in FIG. This gyrotron oscillation tube consists of an electron gun consisting of a cathode 1 and an anode 2, a winding 3 that generates a magnetic field for guiding electrons, a resonant cavity 4, and an electron beam collector 5. Radio waves generated in the resonant cavity pass through a window 6 made of an insulator and advance to an output waveguide 7.

In this oscillator tube, the portion indicated by 5 is used in common as a tube portion serving as an electron beam collector and a tube portion for guiding radio waves. In a high-power oscillator tube, the residual energy of the electron beam collected in the collector 5 is extremely large, and the responsibility for cooling the collector 5 is severe. However, since the collector tube portion is shared with the waveguide tube portion, it is difficult to perform a high cooling duty without interfering with the waveguide function.

[Purpose of the invention]

The present invention aims to improve the above-mentioned drawbacks and provides a gyrotron oscillation tube in which the forward direction of radio waves is separated from the forward direction of electron beams.

[Summary of the invention]

The present invention is a gyrotron oscillator tube in which a radio wave reflector is provided between an electron beam collector and a resonant cavity to propagate radio waves, thereby enabling a collector independent of a waveguide.

〔Effect of the invention〕

According to the present invention, a high power oscillation tube can be constructed and a linearly polarized output wave can be obtained.

[Embodiments of the invention]

Examples of the present invention will be described in detail below. FIG. 2 shows the configuration of the gyrotron oscillation tube of the present invention.

The electron gun section is omitted from the figure. Further, the same parts as those of the conventional device are given the same reference numerals, and the explanation will be omitted.

Assuming that the form of electromagnetic waves generated in the resonant cavity 4 is TEon, where n is a positive integer, the opening of the cylindrical waveguide section 8 is generally cut diagonally and combined with a reflector 9 having a reflecting surface in contact with a parabolic column. Conversion to linearly polarized waves and reversal of the forward direction of radio waves are performed. In the embodiment shown in FIG. 2, the radio waves travel in the direction of the output tubes 10 and 7. The electron beam is guided by the magnetic field generated by the magnetic field generating winding 3CK so that it can travel without colliding with the members 8 and 9.
The electron beams are collected in an electron beam collector that is expanded into an IA shape to increase the heat receiving area.

The reflector 9 is not limited to a reflector with a reflecting surface that touches a parabolic column, but may also use a reflecting surface that touches an elliptical column, and in this case, the convergence effect of the linearly polarized electromagnetic wave beam can be improved. .

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional gyrotron oscillation tube, and FIG. 2 is a sectional view showing a gyrotron oscillation tube according to the present invention. DESCRIPTION OF SYMBOLS 1... Electron gun cathode, 2... Electron gun anode, 3... Winding wire, 4... Resonance cavity, 5... Electron beam controller,
6... Electromagnetic wave output window, 7... Electromagnetic wave output waveguide, 8
...Oblique cut cylindrical waveguide, 9...Reflector, 10...
Electromagnetic wave output waveguide, 11...electron beam collector. Agent Patent Attorney Noriyuki Chika (and 1 other person) Figure 1? Figure 2

Claims (3)

[Claims] (1) In a gyrotron oscillation tube consisting of an electron gun, a magnetic field generator, and a resonant cavity, nine radio wave reflectors are installed at the radio wave output end of the resonant cavity to direct the forward direction of the output radio waves emitted from the electron gun.
A gyrotron oscillation tube characterized in that the gyrotron oscillation tube is configured such that the forward direction of an electron beam guided by a magnetic field generated by a magnetic field generator is different. (2) The gyrotron oscillation tube according to claim 1, wherein the radio wave reflector is a reflector having a reflecting surface that is in contact with a parabolic column. (3) Make the radio wave reflector into an elliptical cylinder #'! 2. The gyrotron oscillation tube according to claim 1, wherein is a reflector having reflective surfaces in contact with each other.