KR200152101Y1 - Klystron - Google Patents

Abstract

The present invention relates to a klystron that generates microwaves, and includes a tube (60) between the cathode (11) and the collector (13) to modulate the density of the electron beam (15) accelerated from the cathode (11) to the collector (13). ) In the excreted klystron, a pair of magnets (63, 63 ') are disposed opposite to the outside of the tube (60), and both sides of the pair of magnets (63, 63') serve as a pole piece. It is characterized in that the yoke (65, 65 ') is coupled to, so that it is configured in this way, the structure is simple and easy to assemble.

Description

klystron

1 is a longitudinal sectional view showing a conventional klystron.

2 is a left side view of FIG.

3 is a longitudinal sectional view showing a klystron according to an embodiment of the present invention (a state in which the cathode part and the collector part are removed).

FIG. 4 is a left side view (state in which the cathode part is removed) of FIG.

* Explanation of symbols for main parts of the drawings

11: cathode 13: collector

60: tube 63,63 ': magnet

65,65 ': yoke 67: fastening means

The present invention relates to a klystron for generating microwaves, and more particularly, to a klystron, which is disposed outside the pair of magnets opposite to the yoke serving as the pole piece, so that the structure is simple and easy to assemble.

Conventionally, as shown in FIG. 1, a klystron forming a plurality of electron beams includes a cathode 11 for emitting electrons, a collector 13 for collecting electrons generated from the cathode 11, and the cathode ( A tube 50 disposed between the cathode 11 and the collector 13 to modulate the density of the plurality of electron beams 15 composed of electrons accelerated from the 11 to the collector 13 and the electron beam 15 Left right magnets (17, 19) and the left right magnets (17, 19) to form a magnetic flux along the longitudinal direction of the electron beam 15 to prevent the diffusion of the electron beam 15 to maintain a constant size Left and right pole pieces 21 and 23, each of which is disposed, a heater 25 disposed inside the cathode 11 to generate electrons from the cathode 11, and heating the cathode 11; The heat generated from the collector 13 by the electrons striking the collector 13 is excluded. Yoke (29, 29 ') and fastening member (2) and the radiating member (27) disposed on the collector (13) to discharge into the 31, 31 ') and a plurality of brackets 33 coupled to each other, and an output end 35 for drawing microwave energy from the tube 50 according to the density change.

Further, an acceleration means (not shown) is provided between the cathode 11 and the collector 13 to apply a constant voltage between the cathode 11 and the collector 13 to accelerate the electron beam 15.

In addition, a concave surface is formed at a plurality of portions of the surface of the cathode 11 facing the collector 13 so that electrons generated from the cathode 11 form a plurality of electron beams 15, and other than the concave surface. The cathode 11 surface is coated with a material (molybdenum or the like) for suppressing electron emission on the cathode 11 surface other than the concave surface so that electrons are not emitted.

The left and right magnets 17 and 19 are respectively disposed outside the cathode 11 and the collector 13 so as to form magnetic flux in a direction opposite to the direction of electrons flowing from the cathode 11 to the collector 13. The inner surface of the left magnet 17 is formed of the S pole and the outer surface thereof is formed of the N pole, and the inner surface of the right magnet 19 is formed of the N pole, and the outer surface thereof is the S pole. Formed.

As shown in FIG. 2, the left right magnets 17 and 19 are radially disposed on the outer circumferential surfaces of the left right pole pieces 21 and 23. As shown in FIG. At this time, the left and right magnets 17 and 19 are coupled to the yoke 29 by the fastening member 31 with the bracket 33 interposed therebetween.

Supports 37 and 37 'supporting the cathode 11 are disposed on the left side of the cathode 11, and supports 37 and 37' are supported on the left ends of the supports 37 and 37 '. The ceramic holder 39 is disposed, and the lugs 43 and 43 'to which the wires 41 and 41' are connected are electrically connected to a power supply device (not shown) on the left side of the ceramic holder 39. Excreted.

The wires 45, one end of which is electrically connected to the heater 25 and the other end of which is electrically connected to the lugs 43 and 43 ′ so as to supply power to the coils inside the supports 37 and 37 ′. 45 ') is excreted.

On the outer circumferential surface of the heat dissipation member 27, a plurality of heat dissipation fin members 47 having a large contact area with external air are attached to the heat dissipation to the outside.

The tube 50 is composed of a tube body 51 and a plurality of channel tubes 53 disposed in the tube body 51 to form a passage through which the electron beam 15 flows.

In the tube body 51, a plurality of cavities 511, 512, 513, and 514 for inducing density modulation of the electron beam 15 by varying the speed of the electron beam 15 are formed therethrough, and are not shown in the cavities 511, 512, 513, and 514. A plurality of channel pipes 53 are formed in which a plurality of drift spaces 535 are formed to penetrate between the gaps 531, 532, 533 and 534 to which a high frequency electric field is applied by a signal source.

That is, the gaps 531, 532, 533, 534 and the plurality of drift spaces 535 are formed by a plurality of gap spaces formed by the plurality of channel tubes 53 and through holes formed in the plurality of channel tubes 53. .

The output end 35 is disposed in the cavity 514 adjacent to the collector 13.

In the conventional Klystron configured as described above, when power is applied to an acceleration means (not shown), a heater (25) and a signal source (not shown), the heater (25) generates heat to heat the cathode (11), and the cathode (11). The electrons are emitted from the concave surface of

The electrons are formed into a plurality of electron beams 15 through a plurality of through holes formed in the channel tube 53 by an acceleration voltage applied between the cathode 11 and the collector 13 by an acceleration unit (not shown). It flows into the channel pipe 53 of the tube 50. At this time, the electron beam 15 is prevented from being diffused by the magnetic flux in the direction of the arrow formed by the left and right magnets 17 and 19 and is maintained at a constant size, and further accelerated by the magnetic flux density of the magnetic flux in the direction of the arrow. That is, since electrons are the flow of -particles, when the magnetic flux density of the magnetic flux formed in the N pole in the S pole direction increases, the flow force of electrons flowing in the right direction increases.

When the electrons introduced into the channel tube 53 of the tube 50 reach the gap 531 of the first cavity 511, a high frequency electric field is formed in the gap 531 by a signal source (not shown). The electrons vary in speed by this high frequency field. That is, these electrons are speed modulated.

The electrons subjected to the speed modulation advance at the speed of each modulated when the electric field passes through the changed drift space 535. Therefore, the accelerated electrons move forward than the average, and the decelerated electrons are later than the average so that the electrons form a lump. This action causes non-uniformity of electron density in each electron beam. That is, each electron beam 15 is density modulated.

When the electrons in the electron beam 15 continue to reach the second cavity 512, the third cavity 513, and the fourth cavity 514 sequentially, the speed modulation of the electrons occurs by the above-described action. For this reason, the electron density of the part where the electron density was high in the electron beam 15 becomes further high. The electron beam 15 having this high electron density is converted into microwave energy by an output circuit not shown in the fourth cavity 514 and output to the outside through the output terminal 35. That is, the kinetic energy of the electron due to the energy of the density change of the electron beam 15, the kinetic energy of the electron due to the acceleration voltage of the acceleration means (not shown), and the magnetic flux density of the magnetic flux formed by the left right magnets 17 and 19 Is output to the outside through the output terminal 35.

It is experimentally known that the density modulation tendency of the electron beams 15 increases in proportion to the inner surface area of each cavity.

Electrons that have lost kinetic energy due to output, that is, electrons, which are mediators of the density change of the electron beam 15, continue to reach the surface of the collector 13. Electrons that reach the surface of the collector 13 are absorbed and extinguished by the collector 13 while colliding with the surface of the collector 13. At this time, the kinetic energy of the electrons that hit the surface of the collector 13 is converted into thermal energy by the kinetic energy that is not converted into microwave energy, and the thermal energy is dissipated to the outside through the heat radiating member 27. The heat radiation fin member 47 attached to the heat radiation member 27 increases the heat radiation effect.

However, in the conventional Klystron configured as described above, as shown in FIGS. 1 and 2, a plurality of left right magnets 17 and 19 radially disposed on the outer circumferential surfaces of the left right pole pieces 21 and 23 are numerous. It is fixed by two fastening members 31 and 31 'to form an annular shape, and since the left and right pole pieces 21 and 23 and the yokes 29 and 29' are separated, the structure is complicated and assembly is not easy. There was a problem.

Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide a klystron that simplifies the structure and facilitates assembly by disposing on the outside of a pair of magnets facing the yoke serving as the pole piece. To provide.

Klystron according to the present invention made to achieve the above object is a klystron in which a tube is disposed between the cathode and the collector to modulate the density of the electron beam accelerated from the cathode to the collector, a pair of magnets on the outside of the tube Oppositely disposed, the yoke is coupled to both sides of the pair of magnets to serve as a pole piece.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected about the part same as the part shown in FIG. 1, and FIG. 2, and the overlapping description is abbreviate | omitted. And, in an embodiment of the present invention will be described by taking an example of the klystron having three cavities.

As shown in FIGS. 3 and 4, the density of the plurality of electron beams 15 composed of electrons introduced from the cathode 11 is modulated between the cathode 11 and the collector 13, not shown. The tube 60 is disposed so that a pair of magnets 63 and 63 'are disposed on the outside of the tube 60 in the radial direction of the tube 60 so as to face each other. On the left side and the right side of the magnet 63 ', yokes 65 and 65' are respectively disposed to serve as pole pieces so that the pair of magnets 63 and 63 'are connected by a plurality of fastening means 67. Are combined.

The tube 60 is formed in its own hollow tubular tube body 69, and the steps in the tube body 69, the plates 71, 73, 75 forming a cavity sequentially disposed The cover plate 77 is disposed at the left end of the tube body 69 and penetrates the plates 71, 73, and 75 in the tube body 69 to form a passage of the electron beam 15. Thus, the channel pipes 79, 81 and 83 are arranged.

The tube body 69 has a hollow cylindrical shape having four stages so that the first, second, and third cavities 691, 692, 693 are easily formed by the plates 71, 73, 75, and the cover plate 77. The right end thereof supports the yoke 65 'and has a structure in which a through hole is formed in the outer peripheral surface of the third end forming the third cavity 693 so that the output end 84 is inserted and disposed.

Through-holes are formed at the centers of the plates 71, 73, and 75 so that the channel tubes 79, 81, and 83 are inserted and disposed.

A plurality of through holes are formed in the channel pipes 79, 81, and 83 and in the cover plate 77 to guide the electron beam 15.

The pair of magnets 63 and 63 'have a fan-shaped shape whose inner side is cut in a constant radius and forms the magnetic flux in a direction opposite to the direction of electrons flowing from the cathode 11 to the collector 13. The left part of (63, 63 ') is formed by the S pole, and the right part is formed by the N pole.

The yoke (65, 65 ') is a disc shape in which both sides are cut, the concave indentation space (65a, 65'a) is formed at a constant depth in the center so that the cathode 11 and the collector 13 is disposed, A plurality of through holes are formed in the lower side surfaces of the concave spaces 65a and 65'a to guide the electron beam 15. In addition, the magnets 63 and 63 'are fastened by the fastening means 67 at each edge portion in the longitudinal direction of the yokes 65 and 65'.

At this time, the fastening means 67 is a bolt for coupling the yoke (65, 65 ') and the magnet (63, 63') in the longitudinal direction inside the magnet (63, 63 ').

In addition, a plurality of mounting brackets 85 are fixed to one side of the yokes 65 and 65 'and the magnets 63 and 63'.

Klystron according to an embodiment of the present invention configured as described above is fixed not shown by arranging the concave space (65a, 65'a) of the yoke (65, 65 ') with the tube (60) in between Fixed by means, and the magnets 63 and 63 'are inserted inside the edge portions of the yokes 65 and 65', and fixed by the fastening means 67, and then the cathode on the left side of the yoke 65. 11 and the ceramic holder 39 are disposed, and the collector 13 and the heat dissipation member 27 are disposed on the right side of the yoke 65 'and simply assembled.

When power is applied to the klystron, a magnetic path is formed by a magnetic field as indicated by an arrow in FIG. 3 and the cathode 11 emits electrons.

That is, the magnetic force from the right side of the magnet (63, 63 ') is the magnetic field entering the left side of the magnet (63, 63') along the yoke (65 '), the tube 60, and the yoke (65) in sequence. To form. At the same time, the electrons emitted from the cathode 11 flow toward the collector 13 by the acceleration means (not shown) and the magnetic fields formed by the magnets 63 and 63 '.

Thus, the yokes 65 and 65 'act as poles and serve as magnetic fields.

As described above, the klystron according to the present invention is a very practical design by simplifying the structure and facilitating the assembly by disposing the yoke serving as the pole piece on the outside of the pair of magnets facing each other.

Claims (3)

In Klystron, in which the tube 60 is disposed between the cathode 11 and the collector 13 to modulate the density of the electron beam 15 accelerated from the cathode 11 toward the collector 13, the tube 60 A pair of magnets (63, 63 ') are disposed to face the outer side of the), and yokes (65, 65') are coupled to both sides of the pair of magnets (63, 63 ') to serve as pole pieces. Klystron, characterized in that. The yoke (65, 65 ') is a disc shape in which both sides are cut, the recessed space (65a, 65') at a constant depth in the center so that the cathode 11 and the collector 13 are disposed Klystron, characterized in that a) is formed. 2. The yoke (65, 65 ') and the magnet (63, 63') is coupled to the inside of the magnet (63, 63 ') by a longitudinally transverse bolt. klystron.