CN111584181A - Constant magnetic field structure - Google Patents
Constant magnetic field structure Download PDFInfo
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- CN111584181A CN111584181A CN202010380005.7A CN202010380005A CN111584181A CN 111584181 A CN111584181 A CN 111584181A CN 202010380005 A CN202010380005 A CN 202010380005A CN 111584181 A CN111584181 A CN 111584181A
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- magnet
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- magnetic field
- magnetizer
- shielding cylinder
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
- H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
- H01J23/087—Magnetic focusing arrangements
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Particle Accelerators (AREA)
Abstract
The invention discloses a constant magnetic field structure, which is characterized in that: the permanent magnet assembly comprises a first magnet and a second magnet which are oppositely arranged, a distance is reserved between the first magnet and the second magnet, and a constant magnetic field area for accommodating a workpiece is formed between the first magnet and the second magnet. The constant magnetic field structure can effectively focus ribbon-shaped electron beams such as a traveling wave tube, a klystron, a backward wave tube and the like, and can also focus electron beams in cylindrical shapes and the like.
Description
Technical Field
The invention belongs to the technical field of vacuum devices, and particularly relates to a constant magnetic field structure.
Background
In the microwave field, traveling wave tubes, klystrons, return wave tube devices and the like are widely applied microwave devices and are used in the fields of radars, electronic countermeasure, communication and the like. The travelling wave tube, the klystron and the wave returning tube are microwave vacuum devices, and the interaction between electron beams and an electromagnetic field in vacuum is utilized to generate the oscillation or amplification effect of the electromagnetic wave. The electron beam needs to maintain its shape during the interaction between the electron beam and the electromagnetic field. Because electrons in the electron beam are negatively charged and mutually repel, the electron beam is diverged and cannot keep the shape unchanged, and at the moment, an axial magnetic field is used for compressing the trajectory of the electron beam, so that the repulsion between the electrons is counteracted, and the shape of the electron beam is kept unchanged in the movement process.
The axial magnetic field can be generated by using the principles of constant magnetism, electromagnetism and the like. The mode of utilizing coil to electrify current for generating magnetic field by electromagnetism is characterized by large volume, high magnetic field, extra power supply, superconducting coil (low temperature environment) when necessary, complex system and less general engineering application. The constant magnetic system utilizes the magnetic field generated by the permanent magnet to introduce the magnetic field into the electron beam track, maintains the shape of the electron beam, prevents the electron beam from diverging, and is widely applied in engineering.
In centimeter wave band and millimeter wave band, the section of electron beam is circular, and the periodic permanent magnetic focusing is widely used. When the traveling wave tube, the klystron and the return wave tube are developed to the THz frequency band, the high-frequency structure size is very small due to the similarity of the wavelength and the high-frequency structure size, and the electron beam is very difficult to adopt a circular section, so that the strip-shaped electron beam is developed. Because the strip electron beam is not axisymmetric, periodic permanent magnet focusing cannot be adopted, and a periodic permanent magnet focusing system is not suitable for focusing the strip electron beam.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. The invention provides a constant magnetic field structure for effectively focusing a ribbon electron beam.
In order to achieve the purpose, the invention adopts the technical scheme that: constant magnetic field structure, its characterized in that: the permanent magnet assembly comprises a first magnet and a second magnet which are oppositely arranged, a distance is reserved between the first magnet and the second magnet, and a constant magnetic field area for accommodating a workpiece is formed between the first magnet and the second magnet.
The constant magnetic field structure further comprises a connecting frame connected with the first magnet and the second magnet.
The link sets up a plurality ofly and all links are for following circumference evenly distributed.
The first magnet includes first magnetizer and first permanent magnet, the second magnet includes second magnetizer and second permanent magnet, and first magnetizer is located the center department of first permanent magnet, and the second magnetizer is located the center department of second permanent magnet, and first magnetizer and second magnetizer adopt magnetic material to make for relative arrangement and first magnetizer and second magnetizer, and first permanent magnet and second permanent magnet adopt permanent magnetic material to make for relative arrangement and first permanent magnet and second permanent magnet, the permanent magnetic field is located between first magnetizer and the second magnetizer.
The first magnet still include with first supplementary constant magnet that first constant magnet is coaxial setting, the second magnet still include with the second constant magnet is coaxial setting and assists the constant magnet for the second of relative arrangement with first supplementary constant magnet, and first supplementary constant magnet and second assist the constant magnet and be located between first constant magnet and the second constant magnet.
The magnetizing directions of the first magnet, the first auxiliary constant magnet, the second magnet and the second auxiliary constant magnet are radial magnetizing, the magnetizing directions of the first magnet and the first auxiliary constant magnet are the same, the magnetizing directions of the second magnet and the second auxiliary constant magnet are the same, and the magnetizing directions of the first magnet and the first auxiliary constant magnet are opposite to the magnetizing directions of the second magnet and the second auxiliary constant magnet.
The first magnet further comprises a first shielding cylinder, the second magnet further comprises a second shielding cylinder which is oppositely arranged, the first shielding cylinder and the second shielding cylinder are made of magnetic conductive materials, the first constant magnet and the first auxiliary constant magnet are located inside the first shielding cylinder, and the second constant magnet and the second auxiliary constant magnet are located inside the second shielding cylinder.
The first magnet further comprises a first structural part, the second magnet further comprises a second structural part, the first structural part and the second structural part are made of non-magnetic materials, the first shielding cylinder and the first constant magnet are arranged on the first structural part, and the second shielding cylinder and the second constant magnet are arranged on the second structural part.
The internal magnetic fields of the connecting frame, the first shielding cylinder, the second shielding cylinder, the first magnetizer and the second magnetizer are in an unsaturated state.
The distance between the first magnet and the second magnet is adjustable.
The constant magnetic field structure can effectively focus ribbon-shaped electron beams such as a traveling wave tube, a klystron, a backward wave tube and the like, and can also focus electron beams in cylindrical shapes and the like.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a cross-sectional view of a constant magnetic field configuration of the present invention;
fig. 2 is a cross-sectional view of a first constant magnet and a second constant magnet;
FIG. 3 is a cross-sectional view of a first shield can and a second shield can;
fig. 4 is a sectional view of a first magnetic conductor and a second magnetic conductor;
FIG. 5 is a cross-sectional view of the attachment bracket;
FIG. 6 is a side view of the attachment frame;
labeled as: 1. a connecting frame; 2. a first shielding cylinder; 3. a first constant magnetic body; 4. a first auxiliary constant magnet; 5. a first magnetizer; 6. a first structural member; 7. a second shielding cylinder; 8. a second constant magnetic body; 9. a second auxiliary constant magnet; 10. a second magnetizer; 11. a second structural member.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.
It should be noted that, in the following embodiments, the "first" and "second" do not represent an absolute distinction relationship in structure and/or function, nor represent a sequential execution order, but merely for convenience of description.
In the present invention, unless otherwise specified, the directional words "inside, outside" and the like included in a term merely represent the orientation of the term in a conventional use state or a colloquial meaning understood by those skilled in the art, and should not be construed as limiting the term.
As shown in fig. 1 to 6, the present invention provides a constant magnetic field structure, which is characterized in that: the permanent magnetic field generator comprises a first magnet and a second magnet which are oppositely arranged, a distance is reserved between the first magnet and the second magnet, a permanent magnetic field area for containing a workpiece is formed between the first magnet and the second magnet, and the workpiece is a microwave vacuum device such as a traveling wave tube, a klystron or a return wave tube.
Specifically, the constant magnetic field structure of the present invention is used for providing a magnetic field source for electron beam focusing of a traveling wave tube, a klystron, and a backward wave tube, as shown in fig. 1 to 4, the first magnet includes a first magnetizer 5 and a first constant magnet 3, the second magnet includes a second magnetizer 10 and a second constant magnet 8, the first magnetizer 5 is located at the center of the first constant magnet 3, the second magnetizer 10 is located at the center of the second constant magnet 8, the first magnetizer 5 and the second magnetizer 10 are arranged oppositely, the first magnetizer 5 and the second magnetizer 10 are made of a magnetic conductive material, the first constant magnet 3 and the second constant magnet 8 are arranged oppositely, the first constant magnet 3 and the second constant magnet 8 are made of a permanent magnetic material, and the constant magnetic field region is located between the first magnetizer 5 and the second magnetizer 10. The magnetic conductive material can be pure iron or steel generally, and the permanent magnetic material is samarium-cobalt magnet or neodymium-iron-boron magnet generally.
As shown in fig. 1, fig. 2, and fig. 4, the first magnetizer 5 and the second magnetizer 10 are both cylinders, the diameters of the first magnetizer 5 and the second magnetizer 10 are the same, and the first magnetizer 5 and the second magnetizer 10 are coaxially disposed. The first constant magnetic body 3 is of a circular ring structure, the first magnetizer 5 is embedded into a central hole of the first constant magnetic body 3, the diameter of the first magnetizer 5 is the same as that of the central hole of the first constant magnetic body 3, and the first constant magnetic body 3 and the first magnetizer 5 are coaxially arranged. The second constant magnet 8 is of a circular ring structure, the second magnetizer 10 is embedded into a central hole of the second constant magnet 8, the diameter of the second magnetizer 10 is the same as that of the central hole of the second constant magnet 8, the second constant magnet 8 and the second magnetizer 10 are coaxially arranged, and the outer diameter of the first constant magnet 3 is the same as that of the second constant magnet 8. One end of the first magnetizer 5 is inserted into the central hole of the first constant magnet 3, the other end of the first magnetizer 5 is positioned outside the first constant magnet 3, one end of the second magnetizer 10 is inserted into the central hole of the second constant magnet 8, the other end of the second magnetizer 10 is positioned outside the second constant magnet 8, and the other end of the first magnetizer 5 is opposite to the other end of the first magnetizer 5, so that the formed constant magnetic field area is positioned between the first magnetizer 5 and the second magnetizer 10, and the constant magnetic field area is a mounting area of the workpiece.
As shown in fig. 1 to 4, the first magnet further includes a first auxiliary constant magnet 4 coaxially disposed with the first constant magnet 3, the second magnet further includes a second auxiliary constant magnet 9 coaxially disposed with the second constant magnet 8 and disposed opposite to the first auxiliary constant magnet 4, the first auxiliary constant magnet 4 and the second auxiliary constant magnet 9 are located between the first constant magnet 3 and the second constant magnet 8, and the first auxiliary constant magnet 4 and the second auxiliary constant magnet 9 are made of permanent magnetic materials. The first auxiliary constant magnet body 4 is of a circular ring structure, the outer diameter of the first auxiliary constant magnet body 4 is the same as the outer diameter of the first constant magnet body 3, the inner diameter of the first constant magnet body 3 is smaller than the inner diameter of the first auxiliary constant magnet body 4, one end of the first magnetizer body 5 is positioned in a center hole of the first constant magnet body 3, and the other end of the first magnetizer body 5 is positioned in the center hole of the first auxiliary constant magnet body 4. The second auxiliary constant magnet 9 is of a circular ring structure, the outer diameter of the second auxiliary constant magnet 9 is the same as the outer diameter of the second constant magnet 8, the inner diameter of the second constant magnet 8 is smaller than the inner diameter of the second auxiliary constant magnet 9, the inner diameter of the second auxiliary constant magnet 9 is the same as the inner diameter of the first auxiliary constant magnet 4, the outer diameter of the second auxiliary constant magnet 9 is the same as the outer diameter of the first auxiliary constant magnet 4, one end of the second magnetizer 10 is located in a center hole of the second constant magnet 8, the other end of the second magnetizer 10 is located in the center hole of the second auxiliary constant magnet 9, and a certain distance is reserved between the second auxiliary constant magnet 9 and the first auxiliary constant magnet 4.
The first auxiliary constant magnet 4 and the second auxiliary constant magnet 9 are magnetized in radial directions, the magnetizing directions of the first auxiliary constant magnet 4 and the second auxiliary constant magnet 9 are opposite, and if the magnetizing direction of the first auxiliary constant magnet 4 is inward in the radial direction, the magnetizing direction of the second auxiliary constant magnet 9 is outward in the radial direction.
As shown in fig. 1 to 4, the first magnet further includes a first shielding cylinder 2, the second magnet further includes a second shielding cylinder 7 in which the first shielding cylinder 2 is disposed oppositely, the first shielding cylinder 2 and the second shielding cylinder 7 are made of a magnetic conductive material, the first constant magnet 3 and the first auxiliary constant magnet 4 are located inside the first shielding cylinder 2, and the second constant magnet 8 and the second auxiliary constant magnet 9 are located inside the second shielding cylinder 7. The first shielding cylinder 2 is of a circular ring structure, the first constant magnet 3 and the first auxiliary constant magnet 4 are located in a center hole of the first shielding cylinder 2, the outer diameter of the first constant magnet 3 is the same as the inner diameter of the first shielding cylinder 2, the outer circular surface of the first constant magnet 3 and the outer circular surface of the first auxiliary constant magnet 4 are attached to the inner circular surface of the first shielding cylinder 2, the thickness of the first shielding cylinder 2 is the same as the sum of the thicknesses of the first constant magnet 3 and the first auxiliary constant magnet 4, one end face of the first constant magnet 3 is attached to one end face of the first auxiliary constant magnet 4, the other end face of the first constant magnet 3 is coplanar with one end face of the first shielding cylinder 2, and the other end face of the first auxiliary constant magnet 4 is coplanar with the other end face of the first shielding cylinder 2. The second shielding cylinder 7 is of a circular ring structure, the second constant magnet 8 and the second auxiliary constant magnet 9 are located in a center hole of the second shielding cylinder 7, the outer diameter of the second constant magnet 8 is the same as the inner diameter of the second shielding cylinder 7, the outer circular surface of the second constant magnet 8 and the outer circular surface of the second auxiliary constant magnet 9 are attached to the inner circular surface of the second shielding cylinder 7, the thickness of the second shielding cylinder 7 is the same as the sum of the thicknesses of the second constant magnet 8 and the second auxiliary constant magnet 9, one end face of the second constant magnet 8 is attached to one end face of the second auxiliary constant magnet 9, the other end face of the second constant magnet 8 and one end face of the second shielding cylinder 7 are coplanar, and the other end face of the second auxiliary constant magnet 9 and the other end face of the second shielding cylinder 7 are coplanar.
As shown in fig. 1, the first magnet further includes a first structural member 6, the second magnet further includes a second structural member 11, the first structural member 6 and the second structural member 11 are made of a non-magnetic material, the first shielding cylinder 2 and the first constant magnet 3 are disposed on the first structural member 6, the second shielding cylinder 7 and the second constant magnet 8 are disposed on the second structural member 11, and the first shielding cylinder 2 and the second shielding cylinder 7 are located between the first structural member 6 and the second structural member 11. The first structural member 6 is a disc-shaped structure, the first structural member 6 is coaxially arranged with the first shielding cylinder 2, the first constant magnet 3, the first auxiliary constant magnet 4 and the first magnetizer 5, the outer diameter of the first structural member 6 is the same as that of the first shielding cylinder 2, and the first shielding cylinder 2, the first constant magnet 3 and the first magnetizer 5 are fixedly arranged on the first structural member 6. The second structure 11 is a disc-shaped structure, the second structure 11 is coaxially arranged with the second shielding cylinder 7, the second constant magnet 8, the second auxiliary constant magnet 9 and the second magnetizer 10, the outer diameter of the second structure 11 is the same as that of the second shielding cylinder 7, and the second shielding cylinder 7, the second constant magnet 8 and the second magnetizer 10 are fixedly arranged on the second structure 11.
The internal magnetic fields of the connecting frame 1, the first shielding cylinder 2, the second shielding cylinder 7, the first magnetizer 5 and the second magnetizer 10 are in an unsaturated state. The peripheral 20cm range and the interior of the constant magnetic field structure are positioned in a high magnetic field area, and the distance between the magnetic material and the constant magnetic field structure is kept to be more than 20 cm. The tool for installing the constant magnetic field structure is made of non-magnetic materials.
As shown in fig. 1, the constant magnetic field structure of the present invention further includes a connecting frame 1 connected to the first magnet and the second magnet, the connecting frame 1 is made of a magnetic conductive material, the connecting frame 1 is provided with a plurality of connecting frames 1, and all the connecting frames 1 are uniformly distributed along the circumferential direction. The link 1 is located the outside of a first shielding section of thick bamboo 2 and a second shielding section of thick bamboo 7, and the one end and the first shielding section of thick bamboo 2 of link 1 are connected, and the other end and the second shielding section of thick bamboo 7 of link 1 are connected, and all links 1 are at the outside of a first shielding section of thick bamboo 2 along circumference evenly distributed, leave the space between every two adjacent links 1 in the circumference, and the work piece is put into the permanent magnetic field area through the space between two links 1.
In this embodiment, the connecting frames 1 are made of pure iron, and four connecting frames 1 are provided. First structural component 6 and second structural component 11 adopt the aluminum alloy material to make, and first shielding section of thick bamboo 2, second shielding section of thick bamboo 7, first magnetizer 5 and second magnetizer 10 adopt pure iron material to make, and first permanent magnet 3, second permanent magnet 8, first auxiliary permanent magnet 4 and second auxiliary permanent magnet 9 adopt samarium cobalt magnetism or neodymium iron boron magnetism material to make. The outer diameter of the first shielding cylinder 2 is 180mm, the inner diameter of the first shielding cylinder 2 is 160mm, the outer diameter of the first constant magnetic body 3 is 160mm, the inner diameter of the first constant magnetic body 3 is 50mm, and the diameter of the first magnetizer 5 is 50 mm.
Preferably, the distance between the first magnet and the second magnet is adjustable, so that the size of the constant magnetic field region is adjustable. The distance between the first magnet and the second magnet is adjusted through adjusting the size of the connecting piece, so that the magnetic field of the constant magnetic field area can be adjusted, and the magnetic field value is larger when the space distance of the constant magnetic field area is smaller; when the space distance of the constant magnetic field area is larger, the magnetic field value is smaller. The constant magnetic field structure can provide a magnetic field exceeding 4000Gs within a range of 120mm, provide a magnetic field exceeding 6000Gs within a range of 100mm, and if the space distance of a magnetic field area is further reduced, the magnetic field value is increased.
The link 1 is connected with first shielding section of thick bamboo 2 through first bolt, the link 1 is through second bolt and second shielding section of thick bamboo 7, set up on the outer disc of first shielding section of thick bamboo 2 and let first bolt male internal thread hole, set up on the outer disc of second shielding section of thick bamboo 7 and let second bolt male internal thread hole, set up the first mounting hole that lets first bolt pass and the second mounting hole that lets the second bolt pass on the link 1, first mounting hole and second mounting hole are for running through the through-hole that sets up along the thickness direction of link 1. The link 1 has the multiple model of length size difference, and the length direction of link 1 parallels with the axis of a first shielding section of thick bamboo 2 and a second shielding section of thick bamboo 7, and the distance size between the first mounting hole on the link 1 of different length and the second mounting hole is different, through changing link 1, can realize the regulation of the distance between first magnet and the second magnet. And the connecting frame 1 adopts the bolt to connect the first shielding cylinder 2 and the second shielding cylinder 7, which is convenient for replacing the connecting frame 1 and adjusting the distance between the first magnet and the second magnet.
The constant magnetic field structure of the structure is an axisymmetric structure, the number of the shielding cylinder, the main constant magnet, the auxiliary constant magnet, the magnetizer and the structural member is two, the shielding cylinder, the main constant magnet, the auxiliary constant magnet, the magnetizer and the structural member are respectively arranged on the left side and the right side, the left side is arranged to form a first magnet, the right side is arranged to form a second magnet,
the workpiece arranged in the constant magnetic field structure is made of non-magnetic material. The added magnetic material can change the distribution of the magnetic field and the magnetic field value in the structure, and the normal work of the workpiece can not be ensured. The workpiece arranged in the constant magnetic field structure is ensured to be arranged on the axis of the constant magnetic field structure, and the direction of the electron beam is parallel to the direction of the magnetic field.
Therefore, the constant magnetic field structure of the invention can effectively focus strip-shaped electron beams such as a traveling wave tube, a klystron, a backward wave tube and the like, and can also focus electron beams in cylindrical shapes and the like.
The smaller the central working area of the constant magnetic field structure is, the stronger the magnetic field is. The constant magnetic field structure can provide a magnetic field of more than 4000Gs within a range of 120mm and a magnetic field of more than 6000Gs within a range of 100 mm.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (10)
1. Constant magnetic field structure, its characterized in that: the permanent magnet assembly comprises a first magnet and a second magnet which are oppositely arranged, a distance is reserved between the first magnet and the second magnet, and a constant magnetic field area for accommodating a workpiece is formed between the first magnet and the second magnet.
2. The constant magnetic field structure of claim 1, wherein: the magnetic coupling further comprises a connecting frame connected with the first magnet and the second magnet.
3. The constant magnetic field structure of claim 2, wherein: the link sets up a plurality ofly and all links are for following circumference evenly distributed.
4. The constant magnetic field structure according to any one of claims 1 to 3, wherein: the first magnet includes first magnetizer and first permanent magnet, the second magnet includes second magnetizer and second permanent magnet, and first magnetizer is located the center department of first permanent magnet, and the second magnetizer is located the center department of second permanent magnet, and first magnetizer and second magnetizer adopt magnetic material to make for relative arrangement and first magnetizer and second magnetizer, and first permanent magnet and second permanent magnet adopt permanent magnetic material to make for relative arrangement and first permanent magnet and second permanent magnet, the permanent magnetic field is located between first magnetizer and the second magnetizer.
5. The constant magnetic field structure of claim 4, wherein: the first magnet still include with first supplementary constant magnet that first constant magnet is coaxial setting, the second magnet still include with the second constant magnet is coaxial setting and assists the constant magnet for the second of relative arrangement with first supplementary constant magnet, and first supplementary constant magnet and second assist the constant magnet and be located between first constant magnet and the second constant magnet.
6. The constant magnetic field structure of claim 5, wherein: the magnetizing directions of the first magnet, the first auxiliary constant magnet, the second magnet and the second auxiliary constant magnet are radial magnetizing, the magnetizing directions of the first magnet and the first auxiliary constant magnet are the same, the magnetizing directions of the second magnet and the second auxiliary constant magnet are the same, and the magnetizing directions of the first magnet and the first auxiliary constant magnet are opposite to the magnetizing directions of the second magnet and the second auxiliary constant magnet.
7. The constant magnetic field structure according to claim 5 or 6, wherein: the first magnet further comprises a first shielding cylinder, the second magnet further comprises a second shielding cylinder which is oppositely arranged, the first shielding cylinder and the second shielding cylinder are made of magnetic conductive materials, the first constant magnet and the first auxiliary constant magnet are located inside the first shielding cylinder, and the second constant magnet and the second auxiliary constant magnet are located inside the second shielding cylinder.
8. The constant magnetic field structure of claim 7, wherein: the first magnet further comprises a first structural part, the second magnet further comprises a second structural part, the first structural part and the second structural part are made of non-magnetic materials, the first shielding cylinder and the first constant magnet are arranged on the first structural part, and the second shielding cylinder and the second constant magnet are arranged on the second structural part.
9. The constant magnetic field structure according to any one of claims 1 to 8, wherein: the internal magnetic fields of the connecting frame, the first shielding cylinder, the second shielding cylinder, the first magnetizer and the second magnetizer are in an unsaturated state.
10. The constant magnetic field structure according to any one of claims 1 to 9, wherein: the distance between the first magnet and the second magnet is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010380005.7A CN111584181B (en) | 2020-05-08 | 2020-05-08 | Constant magnetic field structure |
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| CN202010380005.7A CN111584181B (en) | 2020-05-08 | 2020-05-08 | Constant magnetic field structure |
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| CN111584181A true CN111584181A (en) | 2020-08-25 |
| CN111584181B CN111584181B (en) | 2021-12-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114005720A (en) * | 2021-11-09 | 2022-02-01 | 北京航空航天大学 | Terahertz traveling wave tube slow wave focusing integrated structure and manufacturing method thereof |
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| CN205488025U (en) * | 2015-12-31 | 2016-08-17 | 安徽华东光电技术研究所 | A permanent magnetic focusing system for beam long distance transmission |
| CN109786189A (en) * | 2018-12-30 | 2019-05-21 | 中国电子科技集团公司第十二研究所 | A kind of klystron permanent magnet focusing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140152409A1 (en) * | 2011-08-07 | 2014-06-05 | Haim Rotem | Magnetic enclosure and method |
| CN105047355A (en) * | 2015-08-12 | 2015-11-11 | 中国科学院电工研究所 | Cylindrical permanent magnet system for focusing and guiding electron beam |
| CN105390229A (en) * | 2015-12-10 | 2016-03-09 | 沈阳东软医疗系统有限公司 | Permanent magnet and magnetic apparatus for nuclear magnetic resonance imaging system |
| CN205488025U (en) * | 2015-12-31 | 2016-08-17 | 安徽华东光电技术研究所 | A permanent magnetic focusing system for beam long distance transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114005720A (en) * | 2021-11-09 | 2022-02-01 | 北京航空航天大学 | Terahertz traveling wave tube slow wave focusing integrated structure and manufacturing method thereof |
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| CN111584181B (en) | 2021-12-14 |
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