CN107622931A - A kind of electron gun and gyrotron - Google Patents

A kind of electron gun and gyrotron Download PDF

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Publication number
CN107622931A
CN107622931A CN201610554812.XA CN201610554812A CN107622931A CN 107622931 A CN107622931 A CN 107622931A CN 201610554812 A CN201610554812 A CN 201610554812A CN 107622931 A CN107622931 A CN 107622931A
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China
Prior art keywords
focusing electrode
electron gun
heat
negative electrode
heater
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CN201610554812.XA
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CN107622931B (en
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徐寿喜
顾伟
刘高峰
耿志辉
候筱琬
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Institute of Electronics of CAS
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Institute of Electronics of CAS
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Abstract

The invention provides a kind of electron gun, including heat insulation cylinder, hold-down ring, heat shield, heater, negative electrode and focusing electrode;The negative electrode of electron gun is annular protrusion structure, and focusing electrode is integral type structure, and negative electrode is nested on focusing electrode, ensure that the concentricity of negative electrode and focusing electrode, and focusing electrode and negative electrode pass through laser welding so that the connection between negative electrode and focusing electrode is more firmly, reliably.

Description

A kind of electron gun and gyrotron
Technical field
The present invention relates to microwave vacuum device arts, more particularly to a kind of electron gun and gyrotron.
Background technology
Gyrotron based on the development of electronic cyclotron maser principle involves terahertz wave band in millimeter to be produced Raw high-power electromagnetic wave radiation, can be widely used in plasma heating, advanced radar, particle accelerate, Material process, space debris detection etc..Electron gun is the core component of gyrotron, there is provided is used for The electronics of energy exchange is noted, a kind of electron gun structure of function admirable, not only to meet the electric current of homogeneous tube Transmitting needs, and whole component will assemble simple and reliable, and heater consumption power is low, cathode life foot It is enough long.
Electron gun structure mainly includes negative electrode, the heater for negative electrode to be heated to operating temperature, is used for Supporting construction of fixed negative pole heater assembly etc..For traditional electron gun, with carrying for working frequency Height, the cathode size of gyrotron diminish so that its is complicated, and installation difficulty, this area is needed badly One kind assembles simple and reliable, the high electron gun of the efficiency of heating surface.
The content of the invention
(1) technical problems to be solved
In order to solve above mentioned problem existing for prior art, the invention provides a kind of electron gun and convolution Pipe.
(2) technical scheme
The invention provides a kind of electron gun, including:Heat insulation cylinder 60, hold-down ring 20, heat shield 30, Heater 40, negative electrode 50 and focusing electrode 10;Wherein, the negative electrode 50 is arranged on the focusing electrode One end, the other end of the focusing electrode are fixedly connected with one end of the heat insulation cylinder, in the heat insulation cylinder The heater 40, heat shield 30 and hold-down ring 20 are set gradually on internal focusing electrode 10, it is described Hold-down ring 20 is fixedly connected with focusing electrode 10 and compresses the heater 40 by the heat shield 30.
Preferably, one end of the focusing electrode is tubular construction, and the other end is conical protrusions structure, The conical protrusions structure end of the focusing electrode is provided with coaxial annular groove 11, and the negative electrode 50 is Annular protrusion structure, its shape and size match with the shape and size of the annular groove, described the moon Pole 50 is arranged in the annular groove 11 and is nested on the focusing electrode 10.
Preferably, the hold-down ring is fixedly connected with the tubular construction end of focusing electrode by laser welding, Form screened room.
Preferably, the heat shield 30 is along the circumferential direction uniformly provided with four through holes 31, wherein symmetrically Two through holes 31 be used to draw the lead 41 of heater, two other through hole 31 is reserved through hole.
Preferably, the heat insulation cylinder is fixedly connected with the simple shape structure end of focusing electrode by laser welding.
Preferably, the heat insulation cylinder 60 is provided with least one layer of heat dam, every layer of heat dam edge vertically Even circumferential is distributed with to two heat dams, is misplaced and is symmetrical arranged between adjacent two layers heat dam.
Preferably, the center at the conical protrusions structure end of the focusing electrode is provided with a focusing electrode hole 12.
Preferably, the negative electrode 50 is barium tungsten material;The heater 40 is formed by rhenium tungsten filament coiling.
Preferably, the negative electrode 50 is fixedly connected with focusing electrode 10 by high-temperature soldering;The heater It is made through surface coating alumina powder, and in vacuum drying oven high-temperature process.
Present invention also offers a kind of gyrotron, including the electron gun described in any of the above-described kind.
(3) beneficial effect
It can be seen from the above technical proposal that the electron gun and gyrotron of the present invention have below beneficial to effect Fruit:
(1) different from traditional spheric negative electrode, the negative electrode of electron gun of the present invention is annular protrusion knot Structure, focusing electrode are integral type structure, and negative electrode is nested on focusing electrode, ensure that negative electrode and focusing electrode Concentricity;
(2) focusing electrode and negative electrode pass through laser welding so that the connection between negative electrode and focusing electrode is more Add firm, reliable;
(3) hold-down ring and focusing electrode are fixed together by laser welding so that hold-down ring and Connection between focusing electrode is more firmly, reliably;
(4) hold-down ring compresses heater by heat shield, and total is compact, and mounting process is simple;
(5) hold-down ring and focusing electrode form screened room, reduce heat radiation and conduction, heat shielding effect It should be improved, reduce heater power attenuation, improve negative electrode heat-insulating property, improve heater The efficiency of heating surface;
(6) heat insulation cylinder and focusing electrode are linked together by laser welding, heat insulation cylinder and focusing electrode Connection is more firm;
(7) heat insulation cylinder is provided with heat dam, reduces conduction heat, reduces heater power consumption, improves The efficiency of heating surface of heater;
(8) focusing electrode is also provided with focusing electrode hole, is advantageous to be further ensured that the operating temperature of negative electrode, The efficiency of heating surface is improved, strengthens the performance of electron gun.
Brief description of the drawings
Fig. 1 is the profile vertically of the electron gun of the embodiment of the present invention;
Fig. 2 is the profile vertically of the focusing electrode of the embodiment of the present invention;
Fig. 3 is the profile vertically of the hold-down ring of the embodiment of the present invention;
Fig. 4 is the structural representation of the heat shield of the embodiment of the present invention;
Fig. 5 is the profile vertically of the heat insulation cylinder of the embodiment of the present invention;
Fig. 6 is the cathode heater heating curves figure of the embodiment of the present invention.
【Symbol description】
10- focusing electrodes;11- annular grooves;12- focusing electrodes hole;
20- hold-down rings;
30- heat shields;31- through holes;
40- heaters;41- leads;
50- negative electrodes;
60- heat insulation cylinders;61- heat dams.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific reality Example is applied, and referring to the drawings, the present invention is described in more detail.
As shown in figure 1, the electron gun of the embodiment of the present invention, it is applied to gyrotron, and it includes heat-insulated Cylinder 60, hold-down ring 20, heat shield 30, heater 40, negative electrode 50 and focusing electrode 10;Wherein,
Negative electrode 50 is arranged on one end of focusing electrode, and the other end of focusing electrode and one end of heat insulation cylinder are fixed Connect, heater 40, heat shield 30 and hold-down ring are set gradually on the focusing electrode 10 inside heat insulation cylinder 20, hold-down ring 20 is fixedly connected with focusing electrode 10 and compresses heater 40 by heat shield 30.
In the present embodiment, as illustrated in fig. 1 and 2, focusing electrode one end is tubular construction, and the other end is Conical protrusions structure, the conical protrusions structure end of focusing electrode are provided with coaxial annular groove 11, cloudy Pole 50 is annular protrusion structure, and its shape and size matches with the shape and size of annular groove, ring The negative electrode 50 of shape bulge-structure is arranged in annular groove 11 so that negative electrode 50 is nested in focusing electrode On 10, the concentricity of negative electrode and focusing electrode within 0.05mm, wherein, negative electrode 50 and focusing electrode 10 are fixedly connected by high-temperature soldering, it is preferable that negative electrode 50 is barium tungsten material, negative electrode 50 and focusing Pole 10 is welded together by molybdenum ruthenium high-temperature solder in 2000 degree of hydrogen stove.
The electron gun of the present embodiment, different from traditional spheric negative electrode generation solid electron beam, it is cloudy Extremely annular protrusion structure, focusing electrode are integral type structure, and negative electrode is nested on focusing electrode, ensure that The concentricity of negative electrode and focusing electrode;Focusing electrode and negative electrode pass through laser welding so that negative electrode and focusing electrode Between connection more firmly, it is reliable.
In the present embodiment, as shown in Fig. 1,3 and 4, hold-down ring 20 is stainless steel material, is compressed The tubular construction end of ring and focusing electrode is fixed together by laser welding, and the two forms a screen Room is covered, and make it that the connection between hold-down ring 20 and focusing electrode 10 is more firm, reliable.
Heat shield 30 is refractory metal molybdenum, thickness 1mm, and heat shield 30 is along the circumferential direction uniformly opened There are 4 through holes 31, wherein symmetrical two through holes 31 are used to draw the lead 41 of heater, in addition two Individual through hole 31 is reserved through hole, is easy to the assembly manipulation of electron gun;Wherein, the quantity of heat shield can Think 4-5 pieces.
Heater 40 is formed by rhenium tungsten filament coiling, a diameter of 0.4mm of rhenium tungsten filament, it is preferable that heater table Face is coated with alumina powder, and heater is carried out into vacuum drying oven high-temperature process, the oxidation coated in heater surface Aluminium powder melts so that heater is not easy short circuit, improves the reliability of heater.
The electron gun of the present embodiment, hold-down ring 20 compress heater 40, total by heat shield 30 Compact, mounting process is simple;Hold-down ring 20 and focusing electrode 10 form a screened room together, reduce Heat radiation and conduction, heat shielding effect are improved, and are reduced heater power attenuation, are improved the moon Pole heat-insulating property, improve the efficiency of heating surface of heater.
In the present embodiment, as described in figures 1 and 5, the tubular construction end of heat insulation cylinder and focusing electrode passes through Laser welding links together, so that the connection of heat insulation cylinder and focusing electrode is more firm, it is preferable that every Hot cylinder 60 is that stainless steel material, focusing electrode 10 and heat insulation cylinder 60 can add platinum wire in welding, To further enhance weld strength, heat-insulated barrel thickness is preferably 0.35mm.Wherein, the edge of heat insulation cylinder 60 The heat dam 61 that haves three layers axially is opened, every layer of heat dam 61 is circumferentially evenly distributed with 3 heat dams 61, Heat dam 61 is equal through the distance between the barrel, adjacent two layers heat dam of heat insulation cylinder, and adjacent two Misplace and be symmetrical arranged between layer heat dam, the width of heat dam is preferably 0.2mm.
The structure of above example heat dam only for the purpose of illustration, but the present invention is not limited thereto, In other embodiments, heat insulation cylinder 60 can be provided with least two layers of heat dam vertically, and every layer heat-insulated Groove can circumferentially be evenly distributed with the distance between at least two heat dams, adjacent two layers heat dam Can be with unequal.
The electron gun of the present embodiment, heat insulation cylinder surface are provided with heat dam, reduce conduction heat, reduce Heater power consumption, so as to improving the efficiency of heating surface of heater assembly.
The electron gun of the present embodiment, being powered by lead 41 to heater 40 makes heater 40 generate heat, heat Son 40 heats negative electrode 50 by heat-conduction effect, and negative electrode 50 produces electron beam, realizes electron gun function, The operating temperature of negative electrode is ensure that, the efficiency of heating surface is improved and starts the time.Fig. 6 gives the present invention The cathode heater heating curves of electron gun, when heater heating power is 48W, cathode temperature reaches For 1050 degree, meet the cathode current emission requirement of gyrotron.
Wherein, as illustrated in fig. 1 and 2, the center at the conical protrusions structure end of focusing electrode is also provided with one Focusing electrode hole 12, be advantageous to be further ensured that the operating temperature of negative electrode, improve the efficiency of heating surface, enhancing electricity The performance of sub- rifle.
Another embodiment of the present invention also proposed a kind of gyrotron, and it includes the electronics of above-described embodiment Rifle.
So far, the present embodiment is described in detail combined accompanying drawing.Foundation above description, this Art personnel should have clear understanding to the electron gun and gyrotron of the present invention.
It should be noted that in accompanying drawing or specification text, the implementation that does not illustrate or describe, It is form known to a person of ordinary skill in the art in art, is not described in detail.In addition, The above-mentioned definition to each element is not limited in various concrete structures, shape or the side mentioned in embodiment Formula, those of ordinary skill in the art simply can be changed or replaced to it, such as:
(1) each part of electron gun can also select other structures;
(2) direction term mentioned in embodiment, for example, " on ", " under ", "front", "rear", " left side ", " right side " etc., only it is the direction of refer to the attached drawing, is not used for limiting the scope of the invention;
(3) above-described embodiment can based on design and reliability consideration, be mixed with each other collocation use or Used with other embodiment mix and match, i.e., the technical characteristic in different embodiments can be with independent assortment shape Into more embodiments.
Particular embodiments described above, the purpose of the present invention, technical scheme and beneficial effect are carried out Be further described, should be understood that the specific embodiment that the foregoing is only of the invention and , it is not intended to limit the invention, within the spirit and principles of the invention, that is done any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims (10)

  1. A kind of 1. electron gun, it is characterised in that including:Heat insulation cylinder (60), hold-down ring (20), Heat shield (30), heater (40), negative electrode (50) and focusing electrode (10);Wherein,
    The negative electrode (50) is arranged on one end of the focusing electrode, the other end of the focusing electrode and institute The one end for stating heat insulation cylinder is fixedly connected, and is set gradually on the focusing electrode (10) inside the heat insulation cylinder The heater (40), heat shield (30) and hold-down ring (20), the hold-down ring (20) is with focusing on Pole (10) is fixedly connected and compresses the heater (40) by the heat shield (30).
  2. 2. electron gun as claimed in claim 1, it is characterised in that one end of the focusing electrode is Tubular construction, the other end are conical protrusions structure, and the conical protrusions structure end of the focusing electrode is opened There is coaxial annular groove (11), the negative electrode (50) is annular protrusion structure, its shape and chi The very little shape and size with the annular groove match, and it is recessed that the negative electrode (50) is arranged on the annular In groove (11) and it is nested on the focusing electrode (10).
  3. 3. electron gun as claimed in claim 2, it is characterised in that the hold-down ring and focusing electrode Tubular construction end be fixedly connected by laser welding, form screened room.
  4. 4. electron gun as claimed in claim 1, it is characterised in that heat shield (30) edge Circumferencial direction is uniformly provided with four through holes (31), wherein symmetrical two through holes (31) are used to draw The lead (41) of heater, two other through hole (31) are reserved through hole.
  5. 5. electron gun as claimed in claim 2, it is characterised in that the heat insulation cylinder and focusing electrode Tubular construction end be fixedly connected by laser welding.
  6. 6. electron gun as claimed in claim 5, it is characterised in that heat insulation cylinder (60) edge At least one layer of heat dam axially is provided with, every layer of heat dam is circumferentially evenly distributed with to two heat dams, Dislocation is symmetrical arranged between adjacent two layers heat dam.
  7. 7. electron gun as claimed in claim 2, it is characterised in that the cone of the focusing electrode The center at bulge-structure end is provided with a focusing electrode hole (12).
  8. 8. electron gun as claimed in claim 1, it is characterised in that the negative electrode (50) is barium Tungsten material;The heater (40) is formed by rhenium tungsten filament coiling.
  9. 9. electron gun as claimed in claim 8, it is characterised in that the negative electrode (50) and poly- Burnt pole (10) is fixedly connected by high-temperature soldering;The heater through surface coating alumina powder, and Vacuum drying oven high-temperature process and be made.
  10. 10. a kind of gyrotron, it is characterised in that will including any one of claim 1 to 9 right Seek described electron gun.
CN201610554812.XA 2016-07-14 2016-07-14 A kind of electron gun and gyrotron Active CN107622931B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109698104A (en) * 2018-12-24 2019-04-30 中国工程物理研究院应用电子学研究所 Water-cooled cyclone pipe control electrode
CN110676137A (en) * 2019-09-16 2020-01-10 九江学院 Preparation method of cathode for magnetron

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4873468A (en) * 1988-05-16 1989-10-10 Varian Associates, Inc. Multiple sheet beam gridded electron gun
JP2590750B2 (en) * 1994-08-31 1997-03-12 日本電気株式会社 Impregnated cathode structure
CN102087946A (en) * 2009-12-02 2011-06-08 中国科学院电子学研究所 Structure for improving heating efficiency of cathode heater assembly and preparation method thereof
CN204596744U (en) * 2015-04-23 2015-08-26 安徽华东光电技术研究所 Grid-control TWT cathode construction
CN205016489U (en) * 2015-08-25 2016-02-03 中国科学院电子学研究所 Cathode heater assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4873468A (en) * 1988-05-16 1989-10-10 Varian Associates, Inc. Multiple sheet beam gridded electron gun
JP2590750B2 (en) * 1994-08-31 1997-03-12 日本電気株式会社 Impregnated cathode structure
CN102087946A (en) * 2009-12-02 2011-06-08 中国科学院电子学研究所 Structure for improving heating efficiency of cathode heater assembly and preparation method thereof
CN204596744U (en) * 2015-04-23 2015-08-26 安徽华东光电技术研究所 Grid-control TWT cathode construction
CN205016489U (en) * 2015-08-25 2016-02-03 中国科学院电子学研究所 Cathode heater assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109698104A (en) * 2018-12-24 2019-04-30 中国工程物理研究院应用电子学研究所 Water-cooled cyclone pipe control electrode
CN110676137A (en) * 2019-09-16 2020-01-10 九江学院 Preparation method of cathode for magnetron
CN110676137B (en) * 2019-09-16 2022-05-27 九江学院 Preparation method of cathode for magnetron

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