JPH04137439A - Millimeter wave generating device - Google Patents

Abstract

PURPOSE:To set electron beams at the position of the largest oscillation efficiency without their collision against the circuit wall even in the operation of a high order mode and a large current operation by planting an electrode on the inner surface of a beam tunnel through an insulator. CONSTITUTION:On the inner surface of a beam tunnel 14 to lead the electron beams injected by an electron gun 1 to a high-frequency resonance circuit 3, an electrode 15 is planted through an insulator 16. As a result, when the central axis of the electron beams 2 is slipped from the tube axis, a current to indicate the slippage flows to the electrode 15. Consequently, the passing position of the electron beams 2 can be set at the position to make the oscillation efficiency maximum without collision of electron beams 2 with the circuit wall, by deciding the direction of the slippage from the flow of the current.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a millimeter wave generation device that utilizes an electron cyclotron maser effect such as a gyrotron or gyroklystron.

[Conventional technology]

FIG. 6 is a sectional view showing a conventional millimeter wave generator disclosed in, for example, Japanese Unexamined Patent Publication No. 56-102045. In the figure, 1 indicates a hollow electron beam (hereinafter referred to as electron beam) 2 3 is the cathode part of the electron gun 1, 4 and 5 are the first and second anode parts, and 6 and 7 are the electron gun that emits electrons by generating a magnetic field to cause the electrons of the electron beam 2 to rotate , an electron gun solenoid and a main solenoid that accelerate the vertical velocity of the electron beam 2, 8 a beam tunnel part that guides the electron beam 2 to a high frequency resonance circuit 10, 9 a cutoff part, and 10 a solenoid that is weak to the electron beam 2. A high-frequency resonant circuit that generates millimeter waves by applying a high frequency to cause resonance; 11 is a collector electrode portion that collects the electron beam 2; 12 is a millimeter wave generated by the high-frequency resonant circuit 10; 13 is a millimeter wave 12t - Output window for collection.

Next, the operation will be explained. The electrons are extracted from the cathode section 3 with vertical velocity due to the voltage applied between the cathode section 3 and the first seven-node section 4 and the magnetic field generated by the electron gun solenoid 6. electron beam 2
1, and while making a pivoting movement, the second anode part 5
The beam is accelerated in a direction parallel to the magnetic field by the voltage applied to the beam and introduced into the beam tunnel section 8. And the electron-
42 is magnetically compressed by the strong magnetic field generated by the main solenoid 7 to reduce its diameter, accelerating the vertical velocity of the electrons while decreasing the parallel velocity.
It enters the high frequency resonant circuit 10. Resonance is caused by the eigenmode in the high-frequency resonant circuit 10 usually consisting of a cylindrical cavity and the electron cyclotron maser action, and a part of the vertical velocity component is converted into millimeter waves 12 and collected by the collector electrode section 11. Ru. The millimeter wave 12 is then extracted from the output window section 13.

[Problem to be solved by the invention]

Conventional millimeter wave generators are configured as described above, so when operated in high-order modes and with large currents, the passage of the electron beam is The position must be set very close to the wall of the high-frequency resonant circuit, and due to poor assembly accuracy in tube manufacturing or misalignment of the magnetic axis of the main solenoid, the electron beam often collides with the circuit wall. There was a problem with causing damage.

This invention was made to solve the above-mentioned problems, and it is possible to set the electron beam at the position where the oscillation efficiency is highest without colliding with the circuit wall even during high-order mode and large current operation. The purpose is to obtain a millimeter wave generator with

[Means to solve the problem]

The microwave generator according to the present invention has an electrode implanted through an insulator on the inner circumferential surface of a beam tunnel portion that guides an electron beam emitted by an electron gun to a high frequency resonant circuit.

[Effect]

The millimeter wave generator according to the present invention has an electrode implanted on the inner circumferential surface of the beam tunnel section via an insulator.
When the central axis of the electron beam deviates from the tube axis, a current flows through the electrode to indicate the deviation.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
Figure 2 is a sectional view showing a millimeter wave generator according to an embodiment of the present invention, and Figure 2 is an enlarged sectional view of a beam tunnel section of the millimeter wave generator according to an embodiment of the invention. The same reference numeral indicates the same or similar part, so the explanation will be omitted. Reference numeral 14 denotes a beam tunnel section that guides the electron beam 2 to the high-frequency resonant circuit 10, 14m indicates an inner circumferential surface of the beam tunnel section, and 15 indicates an inner circumferential surface 14& of the beam tunnel section 14 near the cut-off section 9; Insulated from the tunnel part 14 and at the tip end 1
5a is an electrode provided in a protruding state; 16 is an insulator that insulates the beam tunnel section 14 and the electrode 15; 17 is a transverse magnetic field generating coil that generates a magnetic field to intentionally move the central axis of the electron beam 2; and 18 is a transverse magnetic field generating coil. It is an ammeter.

Next, the operation will be explained. The electron beam 2 emitted from the electron gun 1 gradually reduces its diameter as the magnetic field strength increases, and passes through the beam tunnel section 14 and the cutoff section 8.
and is guided to the high frequency resonant circuit 10. However, when setting the electron beam 2 at an optimal position close to the circuit wall of the high frequency resonant circuit 10, the electron beam 2
may collide with the wall. Therefore, this invention is
As shown in FIG. 2, a plurality of electrodes 15 insulated from the beam tunnel section 14 by insulators 16 are installed in the central direction on the inner circumferential surface 14g of the beam tunnel section 14 near the cutoff section 9, and between the electrodes The inner diameter d is set to be the same as or smaller than the inner diameter dc of the cut-off part, and if the center axis of the electron beam 2 and the tube axis are misaligned, a current flows to the ammeter 18, and the electron beam 2 is misaligned. It is possible to determine the direction. Furthermore, by exciting the transverse magnetic field generating coil IT, the center axis of the electron beam 2 is intentionally moved, and the transverse magnetic field strength when the current begins to flow through each ammeter 18 is measured, and the transverse magnetic field strength is calculated backwards. This allows the central axis of the electron beam 2 to substantially coincide with the tube axis. Furthermore, when the transverse magnetic field generating coil 11 is not used, the same effect can be achieved by moving the tube axis itself.

In the above embodiment, the electrode 15 was explained using a rod-shaped electrode, but as shown in FIGS. 3 and 4, a radius of curvature Rt is provided at the tip of the electrode 15 to adjust the contact area with the electron beam. Also good. Furthermore, as shown in FIG. 5, the electrodes 15 may be provided over the inner circumferential surface 14a.

〔Effect of the invention〕

As described above, according to the present invention, since the electrode is implanted on the inner circumferential surface of the beam tunnel section through an insulator, when the center axis of the electron beam deviates from the tube axis, the electrode Since a current flows that indicates the deviation, it is possible to determine the direction of the deviation from the current and set the passing position of the electron beam at the position where the oscillation efficiency is maximized without the electron beam colliding with the circuit wall. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a millimeter wave generator according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a beam tunnel portion of the millimeter wave generator according to an embodiment of the invention, FIGS.
5 and 5 are enlarged cross-sectional views of a beam tunnel portion of a millimeter-wave generator according to another embodiment of the present invention, and FIG. 6 is a cross-sectional view showing a conventional millimeter-wave generator. 1 is an electron gun, 2 is an electron beam, 3 is a high frequency resonant circuit, 1
2 is a millimeter wave, 14 is a beam tunnel section, 15 is an electrode, 1
6 is an insulator. In addition, the same symbols in the figures indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation

Claims (1)

[Claims] An electron gun that emits an electron beam into a magnetic field, and a high frequency that generates millimeter waves by introducing the electron beam emitted by the electron gun through a beam tunnel section and giving a high frequency to the electron beam to cause resonance. 1. A millimeter wave generator comprising a resonant circuit, characterized in that an electrode is implanted on the inner peripheral surface of the beam tunnel portion via an insulator.