JP3191810B2 - Gyrotron device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gyrotron device utilizing a cyclotron resonance maser interaction. In this specification, a gyrotron device will be described, but a gyro klystron and a gyro TWT (Traveling Wave Tube) will be described.
e), a case of an electron tube such as a gyro peniolotron may be used, and the same effect is obtained.

[0002]

2. Description of the Related Art A gyrotron device utilizing a cyclotron resonance maser interaction between an electron beam and a high-frequency electromagnetic field in the eigenmode of a cavity resonator is disclosed in, for example, Japanese Patent Application Laid-Open No. Sho 56-102045. FIG. 8 schematically shows such a conventional gyrotron device. In FIG. 8, reference numeral 1 denotes an electron gun for emitting an electron beam 9 composed of a cathode 2, an electron emitting portion 3 on the cathode 2, a first anode 4, and a second anode 5. Numeral 6 denotes a cavity resonator in which an electron beam 9 and a high-frequency electromagnetic field interact with each other to generate an electromagnetic wave 10, 7 denotes a collector for collecting the electron beam 9 after the interaction, and 8 denotes an electromagnetic wave
An output window 300 for taking out the gyrotron 200 includes the electron gun 1, the cavity resonator 6, the collector 7, the output window 8, and the like. The gyrotron device includes a main electromagnet 11 for generating a magnetic field and an electron gun electromagnet 12.

[0003] The beam axis direction here refers to the direction in which the hollow electron beam 9 is emitted from the electron gun 1, that is, the direction from the electron gun 1 to the output window 8, and the Z axis in FIG. 8. It is. Hereinafter, it is referred to as an axial direction for simplicity.

Next, the operation will be described. The electron beam 9 emitted from the electron emission portion 3 on the cathode 2 of the electron gun 1
Is accelerated by an electric field between the cathode 2 and the first anode 4, and drifts in the axial direction while rotating, due to the axial magnetic field component generated by the electron gun electromagnet 12. Furthermore, since the magnitude of the strong axial magnetic field component generated by the main electromagnet 11 is maximum at the center of the cavity 6, the electron beam 9 moves in the axial direction as it travels toward the cavity 6. Increase the velocity in the direction perpendicular to the magnetic field,
At the same time, it enters the cavity resonator 6 while decreasing the parallel velocity.

[0005] The electrons that are cyclotron-moving by the axial magnetic field generated by the main electromagnet 11 interact with the high-frequency electromagnetic field of the eigenmode in the normally cylindrical cavity resonator 6 and the cyclotron resonance maser, thereby causing the electrons to move in the axial direction. Part of the energy due to the velocity component in the direction perpendicular to the magnetic field is converted to the energy of the electromagnetic wave 10. The electron beam 9 having completed the interaction in the cavity resonator 6 is
And the electromagnetic wave 10 excited by the cavity resonator 6 is
The light passes through the output window 8 and is taken out.

Conventional example 2. The magnetic field plays an essential role in the oscillating operation of the gyrotron 200, that is, the cyclotron resonance maser interaction. Therefore, the cavity resonator 6
It is important to accurately adjust the axial magnetic field in accordance with the oscillation frequency of the eigenmode to be oscillated in order to operate the gyrotron device 300 efficiently.

In order to obtain a high frequency oscillation, a high magnetic field is required in the cavity resonator 6. Therefore, the main electromagnet 11 and the electron gun electromagnet 1 of the conventional gyrotron device 300 are used.
For 2, a normal conductive magnet, a superconductive magnet, or both have been used. Since the electromagnet can easily adjust the magnetic field to be generated, it is convenient for controlling the oscillation output in accordance with the acceleration voltage of the electron beam 9 and the beam current value.

However, the excitation of the normal conductive magnet requires a large-capacity excitation power supply, consumes a large amount of power, and requires cooling the excitation power supply and the electromagnet with water or the like. On the other hand, superconducting electromagnets are generally expensive, and require the use of liquid helium or the like to cool down to cryogenic temperatures. There was a problem.

In this specification, a device for generating a magnetic field for determining the trajectory of the electron beam 9 or a magnetic field for causing a cyclotron resonance maser interaction will be referred to as a magnetic field generator. In this case, the main electromagnet 11 and the electron gun electromagnet 12 are indicated together.

However, by using a permanent magnet in addition to the electromagnet in the magnetic field generator, the above-mentioned high cost and handling problems have been solved. JP-A-8-64142 discloses that
A conventional gyrotron permanent magnet used in combination with an electromagnet is shown. This is shown in FIGS. 9 and 10.

FIG. 9 is a sectional view of the gyrotron permanent magnet of Conventional Example 2 cut along an axial plane, and FIG. 10 is a gyrotron permanent magnet of Conventional Example 2 cut along a plane perpendicular to the axial direction. It is sectional drawing at the time. 24 is a hollow permanent magnet 2
A cylindrical magnet 26 composed of 5 is a magnet piece, and the magnet pieces 26 are arranged radially to form a hollow permanent magnet 25 in FIG. Here, the arrows described in FIGS. 9 and 10 indicate the direction of magnetization of the magnet, and the starting point of the arrow indicates the N pole and the ending point indicates the S pole.

Here, the cylindrical magnet 24 shown in FIGS. 9 and 10 will be briefly described. In this case, for example, a plurality of trapezoidal magnet pieces 26 are magnetized in the radial direction, and then combined in a donut shape to form a polygonal outer shape and inner shape, and a hollow permanent magnet whose magnetization direction is substantially radial. A magnet 25 is formed, and a plurality of the hollow permanent magnets are arranged in the axial direction to generate an axial magnetic field.

That is, the conventional gyrotron permanent magnet is assembled into several pieces in the axial direction and the circumferential direction as shown in FIGS. 9 and 10. Therefore, the variation of the magnet pieces 26 or the hollow permanent magnets 25 generated at the time of assembly or the hollow permanent magnet 2
5 or the lack of smoothness of the gyrotron permanent magnet, the magnetic field produced by the gyrotron permanent magnet has an axial component (hereinafter abbreviated as Bz) as shown in FIG.
In addition to the above, a component perpendicular to the axial direction (hereinafter abbreviated as Br) necessarily occurs. Since this Bz is due to the dispersion of the individual permanent magnets, it is an amount depending on the location on the Z axis. That is, Br does not have a fixed direction and value everywhere on the Z axis. Of course, if we could make a complete gyrotron permanent magnet, we wouldn't have done that. Note that a direction perpendicular to the axial direction is referred to as a radial direction.

In the end, the gyrotron device 300 is designed so that the electron beam 9 drifts in the axial direction while rotating by Bz. However, since there is a finite Br at the time of operation, the drift trajectory of the electron is Bz. And Br in the direction of the combined vector, and consequently deviates from a predetermined trajectory.

Next, FIG. 11 is a graph showing the magnitude of Bz produced by the magnetic field generator used in the conventional example 2 described in Japanese Patent Application Laid-Open No. 8-64142 with respect to the Z axis. In the conventional gyrotron device 300, the operation was performed using only the portion where the magnetic field distribution was Bz> 0 in FIG. Here, Bz> 0 is a region where the magnetic field is oriented in the direction in which the electron beam 9 is emitted, and Bz <0 is where the magnetic field is oriented in the direction opposite to the direction in which the electron beam 9 is emitted. Refers to the area where

[0016]

In the conventional gyrotron apparatus, only one gyrotron can be used for one gyrotron permanent magnet.

The present invention has been made to solve the above problems, and has as its object to obtain a gyrotron device that makes effective use of resources.

[0018]

According to the present invention, there is provided a first gyrotron having a first electron gun for emitting a first electron beam, and a first gyrotron having a second electron beam for emitting a second electron beam. A second gyrotron having two electron guns,
A first magnetic field that is distributed on a beam axis of the first electron beam in a direction parallel to an emission direction of the first electron beam and generates an electromagnetic wave by an interaction with the first electron beam; A common magnetic field that is distributed on the beam axis of the second electron beam in a direction opposite to the direction of the magnetic field of the first magnetic field and generates a second magnetic field that generates an electromagnetic wave by interaction with the second electron beam. A magnetic field generator having a permanent magnet.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an embodiment of the present invention in which two or more gyrotrons are operated by one magnetic field generator will be described. FIG. 1 is a conceptual diagram illustrating the concept of an embodiment of the present invention. FIG. 1A is a cross-sectional view of the permanent magnet 20 shown in a perspective view in FIG. 6, where the center is the Z axis and the axis perpendicular to the Z axis is the r axis. Here, the Z axis refers to the hollow electron beam 9 from the electron gun 1.
In the direction from the electron gun 1 toward the output window 8. The permanent magnet 20 is configured by arranging a plurality of hollow magnets 25 along the Z-axis direction. The hollow magnet 25 is formed by magnetizing a plurality of trapezoidal magnet pieces 26 shown in FIG. 7 in the radial direction and then combining them in a donut shape.

FIG. 1B shows the magnetic field strength generated by the permanent magnet 20 shown in FIG. 1A, and FIG. 1C shows how the gyrotrons 200 are arranged when a magnetic field distribution is generated as shown in FIG. 1B. FIG. 2 shows a magnetic field distribution in the Z-axis direction created by electromagnets (the main electromagnet 11 and the electron gun electromagnet 12 in FIG. 8) used in the conventional gyrotron device 300. In FIG. 1, reference numeral 20 denotes a permanent magnet which is constituted by a hollow magnet 25 and generates a magnetic field in the gyrotron, and 200 denotes a gyrotron. In FIG. 1A, N and S described on each cylindrical magnet 25 mean the N pole and S pole of the magnet, respectively, and mean that they are magnetized as shown in the figure.

Incidentally, the cylindrical magnet in this embodiment corresponds to the cylindrical magnet used in the claims. Further, a cylindrical magnet in each embodiment described later also corresponds to a cylindrical magnet in the claims.

As described in the conventional example 2, the electromagnetic field generator of the conventional gyrotron device 300 uses an electromagnet of a solenoid coil. FIG. 2 shows the magnetic field distribution of the Bz component generated on the Z axis by the solenoid coil.
In this case, the Bz magnetic field distribution had only one type of region where Bz> 0.

However, the permanent magnet 20 has been used for the magnetic field generator, and the Bz magnetic field distribution has three regions including the reversal magnetic field as shown in FIG. 1B. However, the conventional gyrotron device 300 uses only the area (II) and operates only one gyrotron. In one embodiment of the present invention, (I), (II), (II)
I) ((I) Bz <0, (II) Bz> 0, (II
I) Bz <0) Three gyrotrons 200 are operated using three regions.

The magnetic fields in the three regions created by these permanent magnets 20 satisfy the conditions of the magnetic field necessary for the gyrotron operation. That is, as shown in FIG. 1C, three gyrotrons 200 are arranged on the central axis (Z axis) of the permanent magnet 20.
Is installed, two or more gyrotrons can be moved by one permanent magnet 20. When the electromagnetic waves 10 emitted from the gyrotron 200 arranged at the center when the three gyrotrons are arranged are bent and extracted using a bend or the like, the electromagnetic waves 10 can be extracted without disturbing the gyrotrons 200 at both ends. it can.

Thus, there is an effect that the initial cost can be reduced and the resources of the permanent magnet can be effectively used.

In this embodiment, a method for operating three gyrotrons 200 has been described, but the number of gyrotrons 200 is not particularly limited to three. That is, since the Bz magnetic field distribution on the Z-axis has at least a positive distribution region and a negative distribution region, each region is applied to the gyrotron 200. In other words, in this embodiment, there are a total of three positive distribution regions and three negative distribution regions of the Bz magnetic field distribution on the Z-axis. Therefore, only three gyrotrons are operated, and the number of gyrotrons is equal to the number of regions. TRON 200
Can be activated. For example, if there are a total of five magnetic field regions, theoretically five gyrotrons 200
Can be activated. Of course, it is necessary that a magnetic field sufficient to operate the gyrotron 200 is generated in all five regions.

The cylindrical magnet used in this embodiment means that the inner shape and outer shape indicate a circle, the inner shape and the outer shape are polygons, and the inner shape and the outer shape are circles and polygons. And the same applies to each of the embodiments described later.

Embodiment 2 An embodiment in which two or more gyrotrons 200 are operated by one magnetic field generator in the present invention will be described. FIG. 3 shows a permanent magnet according to an embodiment of the present invention. FIG. 3A is a cross-sectional view of the permanent magnet taken along a plane parallel to and including the Z axis, and FIG. 3B is a magnetic field distribution of Bz produced by the permanent magnet used in this embodiment. Fig. 3 (c) shows gyrotron 2
FIG. 3D is a list of all combinations of the gyrotron 200 arrangement methods according to an embodiment of the arrangement method of the gyrotron 200.

In FIG. 3, the same reference numerals as those in FIG. 1 denote the same or similar parts. 1 is an electron gun for emitting an electron beam, 8 is an output window for outputting an electromagnetic wave from a gyrotron, 24a is a first cylindrical magnet, 24b is a second cylindrical magnet, 24c is a third cylindrical magnet, 200a Is the first
A first gyrotron having a first electron gun for emitting a second electron beam, and a second gyrotron 200b having a second electron gun for emitting a second electron beam. The Z axis in the figure is the same as the first beam axis direction. Here, the beam axis direction is a direction in which the electron beam is emitted. The first beam axis direction is for the first electron beam, and the second beam axis direction is for the second electron beam. Determine the direction.

The permanent magnet 20 includes three cylindrical magnets 24
a, 24b and 24c. The first cylindrical magnet 24a is magnetized in the direction of the first beam axis, and the second cylindrical magnet 24b is magnetized perpendicular to the direction of the first beam axis and toward the center of the first beam axis. The third cylindrical magnet 24c is magnetized in a direction opposite to the direction of the first beam axis, and the first cylindrical magnet 24a, the second cylindrical magnet 24b, and the third cylindrical magnet 24c are magnetized. They are arranged in order. Each of the cylindrical magnets 24a, 24b, 24c is constituted by a hollow magnet as shown in FIG.

Here, the size of each cylindrical magnet is the largest for the second cylindrical magnet 24b as shown in the figure, but the size does not matter in particular. What is important is the magnitude of magnetization of each cylindrical magnet, and it is sufficient that each cylindrical magnet is magnetized so as to create a desired magnetic field distribution. That is, the magnitude of the ratio of magnetizing may be changed in various ways, and may be determined to a size suitable for use. Note that the center direction of the first beam axis is a direction toward the first beam axis.

Next, how to arrange the first gyrotron 200a and the second gyrotron 200b will be described. In the present embodiment, the first gyrotron 200a
Are arranged in the first magnetic field distribution on the Z axis, but the first gyrotron 200a may be arranged in the second magnetic field distribution on the Z axis. Further, the orientation of each gyrotron 200a, 200b when arranging each gyrotron 200a, 200b may be either left or right in the figure. That is, FIG.
As described in the above, in this embodiment, eight arrangement patterns are possible. However, combination 1 or combination 5 that does not require the use of bends or the like is more ideal.

Next, the operation will be described. In one embodiment of the present invention, since the permanent magnet 20 is configured as shown in FIG. 3A, (I) B as shown in FIG.
Two regions of z> 0 and (II) Bz <0 are created. The magnetic field distributions of these two regions are symmetrical only with the opposite sign. Also, the magnetic field distribution in these two regions is sufficient to operate the gyrotron and is available.

As shown in FIG. 3C, (I) Bz>
0, (II) By installing two gyrotrons 200a and 200b in accordance with the magnetic field region of Bz <0,
One permanent magnet 20 and two gyrotrons 200a,
200b can be driven.

In the case where the output electromagnetic wave of the combination shown in FIG. 3D collides with another gyrotron (for example, the case where the first electron beam collides with the gyrotron 200b as in combination 2). May be obtained by using a bend or the like to avoid the gyrotron as in the above-described embodiment.

Embodiment 3 Another embodiment of the present invention in which two or more gyrotrons 200 are operated by one magnetic field generator will be described. FIG. 4 shows a gyrotron device according to this embodiment, and specifically shows a configuration of a first gyrotron 200a and a second gyrotron 200b according to the second embodiment.

In FIG. 4, the same reference numerals as in FIG. 3 denote the same or similar parts. Reference numeral 2 denotes a cathode, 3 denotes an electron-emitting portion on the cathode 2, 14 denotes an anode which takes out the electron beam 9 from the electron-emitting portion 3 and accelerates the electron beam 9 in a pair with the cathode 2, and 6 denotes an electron beam 9 and a high-frequency electromagnetic field. And a cavity resonator that interact with each other to generate an electromagnetic wave 10, and 7 is an electron beam 9 after the interaction.
, A collector 30 for fine-tuning the main magnetic field for finely adjusting the axial component generated by the permanent magnet 20 in the vicinity of the cavity resonator 6, a reference numeral 50 indicating the axial component generated by the permanent magnet 20 in the vicinity of the electron gun 1 Electron gun magnetic field fine adjustment electromagnet for fine adjustment,
Reference numeral 300a denotes a first gyrotron 200 including the electron gun 1, the cavity resonator 6, the collector 7, the output window 8, and the like.
a, a main magnetic field fine-adjusting electromagnet 30 and an electron gun magnetic field fine-adjusting electromagnet 50 for generating a magnetic field in the beam axis direction of the first gyrotron 200a to impart a swirling motion to the electron beam 9
The first gyrotron device 300b composed of the electron gun 1, the cavity resonator 6, the collector 7, and the output window 8
A second main gyrotron 200b composed of the same, etc., a main magnetic field fine-adjustment electromagnet 50 and an electron gun magnetic field fine-adjustment electromagnet 50 for generating a magnetic field in the beam axis direction of the second gyrotron 200b so as to give a swirling motion to the electron beam 9. A second gyrotron device comprising: The ten electromagnetic waves generally indicate microwave and millimeter wave electromagnetic waves. However, the present invention is not limited to these frequency ranges. The Z axis in the figure is the same as the first beam axis direction.

The first gyrotron 200a is installed in the region of the first electron beam axial component among the magnetic field components generated on the Z axis generated by the permanent magnet 20, and the magnetic field component generated on the Z axis generated by the permanent magnet 20 The second gyrotron 200b is installed in the region of the first electron beam axial component and the component in the opposite direction, and the electromagnetic waves 10 output from the respective gyrotrons 200a and 200b are output without colliding with each other and diametrically opposite. It has become. The arrangement of the gyrotron 200a and the gyrotron 200b is described in Embodiment 2.
, And is not particularly limited to this embodiment.

Next, the operation will be described. The electron beam emitted from the electron emitting portion 3 on the cathode 2 of the electron gun 1 is accelerated by an electric field between the cathode 2 and the anode 14 and drifts in an axial direction while rotating by a magnetic field generated by the permanent magnet 20. I do. Further, the permanent magnet 20
The electron beam is compressed by the strong magnetic field generated by the main magnetic field fine-tuning electromagnet 30 and the electrons enter the cavity 6 while increasing the velocity in the direction perpendicular to the magnetic field and decreasing the velocity in the parallel direction. At that time, a cyclotron resonance maser interaction occurs between the electrons in cyclotron motion and the high-frequency electromagnetic field of the eigenmode in the normally cylindrical cavity resonator 6 due to the axial magnetic field generated by the magnet. As a result, part of the energy due to the velocity component in the direction perpendicular to the magnetic field of the electrons is converted into the energy of the electromagnetic wave 10.

The electron beam that has completed the interaction in the cavity resonator 6 is collected by the collector 7, and the electromagnetic wave 10 excited by the cavity resonator 6 passes through the output window 8 and is extracted to the outside. In this case, it is taken out from the two output windows 8 at both ends of the permanent magnet 20. As a result, two conventional gyrotron devices are combined into one to save space.
In addition, since two gyrotrons can be operated with one permanent magnet, cost reduction and effective use of magnet resources can be achieved.

Embodiment 4 FIG. Another embodiment of the present invention in which two or more gyrotrons 200 are operated by one magnetic field generator will be described. FIG. 5 is a conceptual diagram illustrating the concept of an embodiment of the present invention. FIG.
(A) is a cross-sectional view when the permanent magnet 20 is cut along a plane parallel to and including the Z axis, and the center is defined as the Z axis.
FIG. 5B shows the magnetic field strength on the Z axis at this time, and FIG. 5C shows how to arrange the gyrotron. In FIG. 5B, the solid line represents the magnetic field distribution in this embodiment, and the dashed line represents the magnetic field distribution in the third embodiment.

In FIG. 5, the same reference numerals as in FIG. 3 denote the same or similar parts. 24d is a first cylindrical magnet, 24e is a second cylindrical magnet, 24f is a third cylindrical magnet, 24g is a fourth cylindrical magnet, 24h is a fifth cylindrical magnet, 200a is a first cylindrical magnet. Gyrotron, 200b
Is a second gyrotron.

The permanent magnet 20 comprises five cylindrical magnets, and the first cylindrical magnet 24d is magnetized in a direction perpendicular to the first beam axis direction and in a direction opposite to the center direction of the first beam axis. The second cylindrical magnet 24e is magnetized in the first beam axis direction, and the third cylindrical magnet 24f is perpendicular to the first beam axis direction and toward the center of the first beam axis. The fourth cylindrical magnet 24g is magnetized, the fourth cylindrical magnet 24g is magnetized in a direction opposite to the first beam axis direction, and the fifth cylindrical magnet 24h is perpendicular to the first beam axis direction and , A first cylindrical magnet 24d, a second cylindrical magnet 24e, a third cylindrical magnet 24f, a fourth cylindrical magnet 24g, and a fifth cylindrical magnet. 24h.

That is, cylindrical magnets 24d and 24h magnetized in the radial direction from the Z axis are added to both ends of the magnet described in FIG. Thereby, Bz> 0 and Bz <
In the region of 0, the portion asymptotically approaching Bz = 0 (portions (i) and (ii) in the drawing) gradually approaches Bz = 0 as compared with the example of FIG. b)).
Each gyrotron 200 is provided by the permanent magnet 20.
a, 200b can cover most of the magnetic field strength required for the operation. Note that the center direction of the first beam axis is the first direction.
In the direction of the beam axis.

The arrangement of the gyrotrons 200a and 200b is the same as that described in the second embodiment (FIG. 3D).

Next, the operation will be described. In this embodiment, the asymptote to Bz = 0 becomes gentle, so that the distance at which the electron beam is captured by the collector 7 can be increased. Therefore, the operation of the gyrotron having a larger power than that of the gyrotron shown in FIG. 3 becomes possible (FIG. 5).
(C)).

[0047]

As described above, according to the present invention, the first gyrotron and the second gyrotron are installed in the first and second magnetic field distributions generated by the common permanent magnet, respectively. Manufacturing costs can be reduced, and the resources of the magnetic field generator can be used effectively.

When the first to third cylindrical magnets are arranged in this order along the first beam axis direction, the first magnetic field distribution and the second magnetic field produced by one magnetic field generator are provided. Two gyrotrons can be operated using the distribution. Therefore, the cost of the device can be reduced and the resources of the magnetic field generator can be used effectively.

Further, the first to fifth cylindrical magnets are
In this order along the beam axis direction of
As compared with the case where two cylindrical magnets are arranged, a wider magnetic field region can be used for the gyrotron in the beam axis direction. Therefore, a high output high frequency can be output.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing Embodiment 1 of the present invention.

FIG. 2 is a graph of an axial magnetic flux density created by the electromagnet of Conventional Example 1.

FIG. 3 is a conceptual diagram showing Embodiment 2 of the present invention.

FIG. 4 is a gyrotron device according to a third embodiment of the present invention.

FIG. 5 is a conceptual diagram showing Embodiment 4 of the present invention.

FIG. 6 is a perspective view of a gyrotron permanent magnet.

FIG. 7 is a perspective view of a magnet piece of a gyrotron permanent magnet.

FIG. 8 is a gyrotron device of Conventional Example 1.

FIG. 9 is a cross-sectional view of a plane parallel to the axis of the permanent magnet of Conventional Example 2.

FIG. 10 is a cross-sectional view taken along a plane perpendicular to the axis of the permanent magnet of Conventional Example 2.

FIG. 11 is a magnetic field distribution by a permanent magnet of Conventional Example 2.

[Explanation of symbols]

1 electron gun, 2 cathodes, 3 electron emission part, 4 first
Anode, 5 second anode, 6 cavity resonator, 7
Collector, 8 output window, 9 electron beam, 10 electromagnetic wave, 11 main electromagnet, 12 electron gun electromagnet, 14 anode, 20 permanent magnet, 24 cylindrical magnet, 24a, 2
4d 1st cylindrical magnet, 24b, 24e 2nd cylindrical magnet, 24c, 24f 3rd cylindrical magnet, 24g
Fourth cylindrical magnet, 24h Fifth cylindrical magnet, 25
Hollow magnet, 26 magnet pieces, 200 gyrotron,
200a first gyrotron, 200b second gyrotron, 300 gyrotron device.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 25/00

Claims (3)

(57) [Claims] 1. A first gyrotron having a first electron gun for emitting a first electron beam, and a second gyrotron having a second electron gun for emitting a second electron beam.
A first magnetic field that is distributed on a beam axis of the first electron beam in a direction parallel to an emission direction of the first electron beam, and generates an electromagnetic wave by interaction with the first electron beam. And a second magnetic field that is distributed on the beam axis of the second electron beam in a direction opposite to the direction of the magnetic field of the first magnetic field and generates an electromagnetic wave by interaction with the second electron beam. A gyrotron device comprising: a magnetic field generator having a common permanent magnet to generate. 2. The permanent magnet according to claim 1, wherein the permanent magnet includes a first cylindrical magnet magnetized in a first beam axis direction parallel to a first electron beam emission direction, and the first beam axis. A second cylindrical magnet perpendicular to the direction and magnetized in the direction of the center of the beam axis of the first electron beam; and a third cylindrical magnet magnetized in a direction opposite to the first beam axis direction. A gyrotron device, wherein a magnet and a magnet are sequentially arranged in the first beam axis direction. 3. The apparatus according to claim 1, wherein the permanent magnet is perpendicular to a first beam axis direction parallel to an emission direction of the first electron beam, and is a center direction of a beam axis of the first electron beam. A first cylindrical magnet magnetized in a direction opposite to the first direction, a second cylindrical magnet magnetized in the first beam axis direction, and a first cylindrical magnet perpendicular to the first beam axis direction. A third cylindrical magnet magnetized in the center direction of the beam axis of the electron beam, a fourth cylindrical magnet magnetized in a direction opposite to the first beam axis direction, and the first beam axis direction And a fifth cylindrical magnet magnetized perpendicularly to and magnetized in a direction opposite to the center direction of the beam axis of the first electron beam, and sequentially arranged in the first beam axis direction. A gyrotron device, characterized in that: