JPH04296428A - Tuning mechanism of klystron - Google Patents

Abstract

PURPOSE:To provide a tuning mechanism of a klystron with enhanced reliability by decreasing the external function to be imposed on a tuning piece, and removing the occurrence of an abnormal resonance mode or the occurrence of the transition of a resonance mode. CONSTITUTION:A tuning piece supporting mechanism 6 is supported by a Tu supporting body 11 fixed in a cavity resonator 1, and a movable part 7 of a driving mechanism 9 is provided between the tuning piece supporting mechanism 6 and the cavity resonator 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a klystron tuning mechanism, and more particularly to a klystron tuning mechanism for amplifying electromagnetic waves.

0002

[Prior art] Klystrons emit and emit electron beams.
It consists of an electron gun to be formed, a high-frequency circuit section that causes high-frequency power to interact with the electron beam, a collector that captures electrons, and an electron beam focusing device. Among these, the high-frequency circuit section is connected to a cavity resonator, a tuner for changing the resonance frequency of the cavity resonator, and the tuner,
It consists of a tuning mechanism that supports this.

By the way, when changing the frequency of the high-frequency electromagnetic waves to be amplified, in the klystron, it is necessary to adjust the resonant frequencies of the plurality of cavity resonators to appropriate values while observing the output waveform each time. In order to make this adjustment, a klystron is used that is equipped with a tuning mechanism that has a preset mechanism that allows a specified band amplification to be easily obtained by simply performing a frequency switching operation at a preset specific frequency.

A conventional klystron equipped with such a preset function had a structure as shown in FIG. In FIG. 2, the high-frequency circuit of the klystron consists of a cavity resonator 1, a tuning 3 that changes the resonance frequency by changing the volume of the cavity resonator 1, and a tuning 3 and the cavity resonator 1. and a bellows 4 that is connected to the klystron and allows the synchronizer 3 to move in and out by mechanical displacement while maintaining the vacuum of the klystron. Further, the tuning mechanism 5 has a tuning mechanism 3.
a synchronization support mechanism 6 connected to the synchronization system 3 and always applying a force in a fixed direction to the synchronization system 3 along the axis of the synchronization system 3; and a plurality of adjustment screws 13; a preset portion 8 that is pressed against a tuner shaft 10 connected to the tuner 3 to mechanically displace the tuner 3;
It is composed of a tuning support mechanism 6 and a drive mechanism 9 that connects or disconnects the preset section 8.

[0005] With this structure, the resonant frequency of the cavity resonator 1 is adjusted by the following method. The tuner shaft 10 to which the tuner 3 is connected and fixed is constantly subjected to a force that tries to pull the tuner 3 outward (to the right in the figure) due to the restoring force of the tuner support mechanism 6. A plurality of adjustment screws 13 constituting the preset portion 8 are pressed against one end of the tuner shaft 10, and the tuner 3 can be moved in and out depending on the degree to which the adjustment screws are screwed in. The resonant frequency of the cavity resonator 1 is uniquely determined by the position of the cavity movable plate 2 coupled to the end face of the tuner 3 constituting one wall of the cavity resonator 1. Therefore, the adjustment screw 13
The resonant frequency can be variably adjusted by adjusting the degree of screwing.

In addition, when switching to a different preset frequency, first rotate the locking shaft 16 provided in the drive mechanism 9, and then rotate the synchronized support mechanism 6, which fits into the locking shaft 16 and the screw, to the inside (left side in the figure). direction). As a result, the adjuster 3 is also pushed inward and released from contact with the adjusting screw 13. When the change gear 15 is turned here, the gear 14 meshed with it
The tuner shaft 10 is also rotated so that a different adjusting screw 13 is directly opposite the tuner shaft 10. If the tuning support mechanism 6 is then moved in the opposite direction, the tuner shaft 10 will come into contact with the adjustment screw 13 again, and as a result, the position of the tuning support mechanism 6 will change, making it possible to switch to the desired frequency. can.

[0007]

[Problems to be Solved by the Invention] In the tuning mechanism 5 having a preset function set by the above-mentioned adjustment, the tuning support mechanism 6 is structured to move relative to the drive mechanism 9 when the frequency is changed. Between the tuner shaft 10 to which the tuned tune 3 is fixed and the cavity resonator 1, the tuned tune 3
It was susceptible to fluctuations in the direction perpendicular to the axis of . For this reason, in a klystron that uses a tuning mechanism 5 with a conventional structure, vibration in the direction perpendicular to the axis of each tuning 3 may cause an abnormal resonance mode to occur or a resonance mode transition within the cavity resonator 1. It has the disadvantage of being easy to occur.

The purpose of the present invention is to eliminate such conventional drawbacks, reduce external fluctuations in the tuning 3,
The object of the present invention is to provide a klystron tuning mechanism with improved reliability without the occurrence of abnormal resonance modes or resonance mode transitions within a cavity resonator.

[0009]

[Means for Solving the Problems] The present invention provides a tuning support mechanism that is connected to the tuning of a cavity resonator and always applies a force in a fixed direction to the tuning along the axis of the tuning. , a preset portion having a plurality of convex portions, the convex portion mechanically displacing a part of the tuning support mechanism, and connecting/disconnecting the contact between the tuning support mechanism shaft and the preset portion; In a klystron tuning mechanism having a drive mechanism that
The tuning support mechanism is supported by a support fixed to the cavity resonator, and the movable part of the drive mechanism is disposed between the tuning support mechanism and the cavity resonator.

0010

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

As shown in FIG. 1, the tuning mechanism 5 of the high-power klystron is composed of a drive mechanism 9 and a preset section 8. The drive mechanism 9 has a tuner shaft 10 connected to the tuner 3 that changes the resonance frequency of the cavity resonator 1, and a tuner that constantly applies a force in the opposite direction to atmospheric pressure to the tuner 3 using the restoring force of a spring. It has a movable part 7 that disconnects the adjustment screw 13 of the tension support mechanism 6 and the preset part 8. On the other hand, the preset section 8 includes a gear 14 and an adjustment screw 13 provided with a plurality of adjustment screws 13 in the circumferential direction.
a transmission shaft 1 that transmits the displacement of to the tuner shaft 10;
It has 2. These are fixed to the cavity resonator 1 via the TU support 11.

To change the frequency of the tuning mechanism 5, turn the locking shaft 16, move the movable part 7 in the direction of arrow A, and disconnect the adjusting screw 13 from the transmission shaft 12.
Turn the change gear 15 until the adjustment screw 13 screwed in to set another operating frequency coincides with the central axis of the transmission shaft 12, and then turn the locking shaft 16 again to set the adjustment screw 13 to the transmission This is done by keeping it pressed against the shaft 12.

[0014]

Effects of the Invention As is clear from the above explanation, in the present invention, the drive mechanism is a TU fixed to a cavity resonator.
Since it is supported by a support, it is not subject to undesirable vibrations or forces that act in a direction perpendicular to the axis of synchronization when changing the frequency, etc., and prevents the occurrence of abnormal resonance modes and the transition of resonance modes. It is possible to prevent this from occurring and improve reliability.

Further, since the present invention allows only the preset section to be separated, it can be applied to a structure in which the preset section is supported by a magnetic circuit section, or to a tuning mechanism in which the preset sections are different.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of an example of a tuning mechanism of a conventional high-power klystron.

[Explanation of symbols]

1 Cavity resonator 2 Cavity movable plate 3 Same tone 4 Bellows 5 Tuning mechanism 6 Tuning support mechanism 7 Movable parts 8 Preset section 9 Drive mechanism 10 Tuner shaft 11 TU support 12 Transmission shaft 13 Adjustment screw 14 Gear 15 Change gear 16 Locking shaft 17 Magnetic circuit section

Claims (1)

[Claims] [Claim 1] Connected to the tuning of the cavity resonator, and
It has a tuning support mechanism that always applies a force in a fixed direction to the tuning axis along the tuning axis, and a plurality of protrusions, and the projections are mechanically attached to a part of the tuning support mechanism. In the tuning mechanism of a klystron, the tuning mechanism includes a preset portion that provides a target displacement, and a drive mechanism that connects and disconnects contact between the tuning support mechanism shaft and the preset portion, wherein the tuning support mechanism includes:
supported by a support fixed to the cavity resonator, and
A tuning mechanism for a klystron, wherein the movable part of the drive mechanism is disposed between the tuning support mechanism and the cavity resonator.