CN212062052U - Magnetic field generating device for terahertz traveling wave tube - Google Patents
Magnetic field generating device for terahertz traveling wave tube Download PDFInfo
- Publication number
- CN212062052U CN212062052U CN202020989556.9U CN202020989556U CN212062052U CN 212062052 U CN212062052 U CN 212062052U CN 202020989556 U CN202020989556 U CN 202020989556U CN 212062052 U CN212062052 U CN 212062052U
- Authority
- CN
- China
- Prior art keywords
- protective sleeve
- magnetic
- special
- magnetic ring
- shaped
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a magnetic field generating device for a terahertz traveling wave tube, which belongs to the field of permanent magnet devices and comprises a magnetic yoke, a permanent magnet and a protective sleeve, wherein the magnetic yoke is of a thin-wall circular ring structure and is divided into a left magnetic yoke (2) and a right magnetic yoke (6) which are symmetrical; the permanent magnet is of a special-shaped magnetic ring structure, the special-shaped magnetic ring is divided into a left special-shaped magnetic ring (1) and a right special-shaped magnetic ring (5), and the protective sleeve is divided into a left protective sleeve and a right protective sleeve; the left protective sleeve is divided into a left outer protective sleeve (3) and a left inner protective sleeve (4); the right protective sleeve is divided into a right outer protective sleeve (7) and a right inner protective sleeve (8); the invention provides a magnetic field generating device for a terahertz traveling wave tube, which generates magnetic field distribution with high magnetic induction intensity, long uniform area length, shorter lifting area and high uniformity on the central axis of the device, has a compact and light structure and is beneficial to the miniaturization development of vacuum electronic devices.
Description
Technical Field
The invention relates to the field of permanent magnet assembly devices, in particular to a magnetic field generating device for a terahertz travelling wave tube.
Background
The traveling wave tube is an important electro-vacuum device and has two advantages of wide frequency band and high gain. The application of the traveling wave tube is very wide, and almost all satellite communications use the traveling wave tube as a final power amplifier. In most radar systems one or several traveling-wave tubes are used as high-power amplifiers for generating high-frequency transmit pulses.
Information technology is rapidly developed, higher requirements are put on information transmission, and a transmitter is required to have higher bandwidth and power to improve the information transmission quantity of a communication system. Global researchers will look at higher frequency spectrum resources-terahertz waves. As an extremely important electro-vacuum device, a terahertz traveling wave tube is produced. The terahertz traveling wave tube has attracted wide attention of domestic and foreign scholars due to the advantages of high output power, wide frequency band, compactness, portability and the like. But is difficult to machine due to the small size of its high frequency components. In recent years, a slow wave structure which can be processed by a micromachining technique such as a meander waveguide has been developed in a breakthrough manner, and a problem of difficulty in processing has been solved. However, the size of the high-frequency region is too small, so that a new challenge is provided for focusing of electron beams, and simulation calculation shows that the magnetic induction intensity of a focusing magnetic field of a traditional periodic permanent magnet focusing system has a bottleneck, so that the requirements of an ultra-large power radar system and electronic countermeasure are difficult to meet. Therefore, there is a need in the art to find a new structure of permanent magnetic field technology to match.
At present, reports about a travelling wave tube magnetic field generating device, such as chinese patents 201020522129.6, 201310114698.5, etc. At present, a traditional periodic permanent magnet focusing system is generally adopted in China, a terahertz research center of China institute of engineering and physics researches a focusing magnetic field of a 0.22THz micro-electro vacuum folded waveguide traveling wave tube, two structures of a solenoid coil and a periodic permanent magnet focusing system are mainly used for realizing focusing, but the solenoid coil consumes energy and is inconvenient, and the periodic permanent magnet focusing system is limited in use due to the limit. The terahertz traveling wave tube magnetic focusing system is explored abroad, and a new magnetic focusing structure is obtained by researching the 0.85THz traveling wave tube focusing system by Nos Rop and Gelman company, wherein the magnetic induction intensity of a uniform region is about 0.85T, the uniformity is poor (+/-5.9 percent), and the length of the uniform region is short (about 22 mm).
That is to say, in order to generate a uniform magnetic field meeting the requirements within a certain range of the central axis at present, the volume and the size of the permanent magnet and the pole shoe are generally increased by adopting methods which are difficult to meet the requirements of a magnetic field lifting area, and simultaneously, the volume and the weight of the permanent magnet device are greatly increased along with the increase of the magnetic field intensity; the traditional periodic permanent magnet focusing system has a bottleneck in focusing magnetic field magnetic induction intensity, and is difficult to meet the requirements of an ultra-large power radar system and electronic countermeasure; the new magnetic field structure at home and abroad has the defects of low magnetic induction intensity in a uniform area, poor uniformity, short length of the uniform area and the like.
Disclosure of Invention
The invention aims to provide a magnetic field generating device for a terahertz travelling wave tube, so as to solve the problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a magnetic field generating device for a terahertz travelling wave tube comprises a magnet yoke, a permanent magnet and a protective sleeve, wherein,
the magnetic yoke is of a thin-wall circular ring structure and is divided into a left magnetic yoke and a right magnetic yoke which are symmetrical;
the permanent magnet is in a special-shaped magnetic ring structure, and the special-shaped magnetic ring is divided into a left special-shaped magnetic ring and a right special-shaped magnetic ring; the left special-shaped magnetic ring is tightly attached to the inner surface of the left magnetic yoke and is fixed with the left magnetic yoke; the right special-shaped magnetic ring is tightly attached to the inner surface of the right magnetic yoke and is fixed with the right magnetic yoke;
the protective sleeve is divided into a left protective sleeve and a right protective sleeve; the left protective sleeve is divided into a left outer protective sleeve and a left inner protective sleeve; the right protective sleeve is divided into a right outer protective sleeve and a right inner protective sleeve; the left inner protective sleeve and the left outer protective sleeve are respectively fixed on two sides of the left special-shaped magnetic ring to form a left magnetic system; the right inner protective sleeve and the right outer protective sleeve are respectively fixed on two sides of the right special-shaped magnetic ring to form a right magnetic system; the left special-shaped magnetic ring and the right special-shaped magnetic ring are magnetized in the radial direction, opposite in polarity in the radial direction, and coaxially and centrally fixed.
The invention adopts the special-shaped magnetic ring permanent magnetic circuit structure, improves the magnetic induction intensity of the atmosphere at the center of the ring, increases the length of a uniform area of a magnetic field, and greatly reduces the distance of a lifting area; meanwhile, the structure is compact and light, and the miniaturization development of vacuum electronic devices is facilitated.
The magnetic field generating device can be widely popularized and used in terahertz traveling wave tubes and can also be popularized and applied to permanent magnet focusing systems of gyrotron rectifiers.
As a preferred technical scheme: the left protective sleeve and the right protective sleeve are opposite in plane and fixed in inner hole centering, and an air gap is formed between the left inner protective sleeve and the right inner protective sleeve.
As a preferred technical scheme: the permanent magnet is a rare earth cobalt permanent magnet, a neodymium iron boron permanent magnet and the like; the magnetic yoke is made of soft magnetic alloy materials such as Q235 and DT 4; the protective sleeve is made of a non-magnetic conductive material, such as 2A12, 304 stainless steel and the like.
As a preferred technical scheme: the protective sleeve is fixedly connected with the permanent magnet through an adhesive, and the protective sleeve is connected with the magnetic yoke through a screw.
As a preferred technical scheme: the special-shaped magnetic ring can be composed of an irregular magnetic ring and a regular magnetic ring.
As a further preferable aspect: the inner diameter of the irregular magnetic ring is of a conical surface structure, a step structure or an inclined surface structure.
As a preferred technical scheme: the special-shaped magnetic ring is formed by splicing a plurality of special-shaped sector magnets and sector magnets, or formed by splicing special-shaped sector magnets, or is an integral special-shaped magnetic ring.
As a preferred technical scheme: compared with the prior art, the invention has the advantages that: the invention provides a magnetic field generating device for a terahertz travelling wave tube, which generates magnetic field distribution with high magnetic induction intensity (0.96575T), long uniform region length (30mm), short lifting region (distance from a magnetic field zero point to the uniform region) (12.7mm) and high uniformity (+ -1.57%) on the central axis of the magnetic field generating device, so that the magnetic induction intensity and uniformity of the uniform region are obviously improved, the length of the uniform region is obviously improved, and the lifting region is shortened.
Drawings
FIG. 1 is a structural view of a magnetic field generating apparatus according to embodiment 1 of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is an isometric view of the shaped magnetic ring of FIG. 2;
FIG. 4 is a structural view of the heteromorphic magnetic ring in FIG. 2;
FIG. 5 is a view of the yoke structure of FIG. 2;
FIG. 6 is a view of the outer sheath of FIG. 2;
FIG. 7 is a view of the inner protective sheath of FIG. 2;
FIG. 8 is the axial magnetic field distribution diagram of the middle region of the air gap magnetic field in the embodiment 1;
FIG. 9 is a structural view of a magnetic field generating apparatus of comparative example 1;
FIG. 10 is a cross-sectional view of FIG. 9;
FIG. 11 is an isometric view of the magnet ring of FIG. 10;
FIG. 12 is a view showing the structure of a magnetic ring;
fig. 13 is a view showing a structure of a yoke in fig. 10;
FIG. 14 is an isometric view of the inner and outer protective sleeves of FIG. 10;
FIG. 15 is an axial field profile of the middle zone of the airgap field of comparative example 1;
FIG. 16 is a structural view of a magnetic field generating apparatus according to embodiment 2 of the present invention;
FIG. 17 is a cross-sectional view of FIG. 16;
FIG. 18 is an isometric view of the shaped magnetic ring of FIG. 17;
FIG. 19 is a view of the structure of the heteromorphic magnetic ring;
FIG. 20 is a view of the yoke structure of FIG. 17;
FIG. 21 is a view of the inner protective sheath of FIG. 17;
FIG. 22 is an isometric view of the outer protective sleeve of FIG. 17;
FIG. 23 is an axial field profile of the middle region of the airgap field of example 2 of the present invention;
FIG. 24 is a structural view of a magnetic field generating apparatus according to embodiment 3 of the present invention;
FIG. 25 is a cross-sectional view of FIG. 24;
FIG. 26 is an isometric view of the step magnet ring of FIG. 25;
FIG. 27 is a view showing a structure of a stepped magnetic ring;
fig. 28 is a view showing a structure of a yoke in fig. 25;
FIG. 29 is a view of the inner protective sheath of FIG. 25;
FIG. 30 is a view of the outer sheath of FIG. 25;
FIG. 31 is the axial magnetic field distribution diagram of the middle region of the airgap magnetic field in example 3 of the present invention.
In the figure: 1-left special-shaped magnetic ring; 2-a left magnetic yoke; 3-left outer protective sleeve; 4-left inner protective sleeve; 5-right special-shaped magnetic ring; 6-right magnetic yoke; 7-right outer protective sleeve; 8-right inner protective sleeve; 9-air gap magnetic field middle zone.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1:
referring to fig. 1 and 2, a magnetic field generating device for a terahertz traveling wave tube comprises a magnetic yoke, a permanent magnet and a protective sleeve, wherein,
the magnetic yoke is of a thin-wall circular ring structure and is divided into a left magnetic yoke 2 and a right magnetic yoke 6 which are symmetrical;
the permanent magnet is in a special-shaped magnetic ring structure, and as shown in fig. 3-5, the special-shaped magnetic ring is divided into a left special-shaped magnetic ring 1 and a right special-shaped magnetic ring 5; the left special-shaped magnetic ring 1 is tightly attached to the inner surface of the left magnetic yoke 2 and is fixed in the middle of the left magnetic yoke 2; the right special-shaped magnetic ring 5 is tightly attached to the inner surface of the right magnetic yoke 6 and is fixed in the middle of the right magnetic yoke 6;
the protective sleeve is divided into a left protective sleeve and a right protective sleeve; as shown in fig. 6-7, the left protective sheath is divided into a left outer protective sheath 3 and a left inner protective sheath 4; the right protective sleeve is divided into a right outer protective sleeve 7 and a right inner protective sleeve 8; the left inner protective sleeve 4 and the left outer protective sleeve 3 are respectively fixed on two sides of the left special-shaped magnetic ring 1 to form a left magnetic system; the right inner protective sleeve 8 and the right outer protective sleeve 7 are respectively fixed on two sides of the right special-shaped magnetic ring 5 to form a right magnetic system; the left special-shaped magnetic ring 1 and the right special-shaped magnetic ring 5 are magnetized in the radial direction, have opposite polarities in the radial direction, and are coaxially centered and fixed;
in the embodiment, the left special-shaped magnetic ring 1 and the right special-shaped magnetic ring 5 are respectively formed by bonding 18 special-shaped sector magnets with 20-degree angles by adhesives and are respectively glued in the left magnetic yoke 2 and the right magnetic yoke 6, and the left inner protective sleeve 4, the left outer protective sleeve 3, the right inner protective sleeve 8 and the right outer protective sleeve 7 are respectively connected with the left magnetic yoke 2 and the right magnetic yoke 6 by screws and are fixed with the contact surfaces of the magnets by adhesives; the protective sleeves in the left magnetic system and the right magnetic system are fixed coaxially in a right-to-left mode, the left magnetic system and the right magnetic system are magnetized along the radial direction, the radial polarities are opposite, and the arrow direction in the figure 2 is the magnetization direction;
the shape structure of the permanent magnet of the embodiment is shown in fig. 3 and 4, the material is a high-performance sintered neodymium iron boron permanent magnet, and the magnetic performance is as follows: residual magnetism Br: 13.6 ± 0.4kGs, coercivity Hcb: ≧ 976kA/m, intrinsic coercivity Hcj: 1592kA/m, magnetic energy product (BH) max: 350 +/-16 kJ/m3, wherein FIG. 5 is a structural drawing of the appearance of a magnet yoke, and FIGS. 6 and 7 are structural drawings of the appearance of inner and outer protective sleeves;
the magnetic induction of the central axis is measured as shown in fig. 2, the magnetic field distribution of the central axis is shown in fig. 8, the magnetic induction of a uniform area is: 0.96575 ± 0.01525T, homogeneous zone length: 30mm, lifting zone distance: 12.7mm, uniformity area magnetic induction uniformity: less than or equal to 1.57 percent, and the weight is as follows: 9 kg.
The magnetic field uniformity of the present invention is calculated by the following formula:
wherein, the uniformity is ± (maximum magnetic field-minimum magnetic field)/average magnetic field/2 × 100%.
Comparative example 1:
compared with the embodiment 1, the permanent magnet does not adopt a special-shaped structure, but selects a regular circular ring structure with the same inner diameter, outer diameter and maximum external dimension, the structure of the inner protective sleeve and the structure of the outer protective sleeve are changed along with the regular circular ring structure, and the position relation, the connection relation and the selected materials of all the components are the same, as shown in fig. 9 to 14. The magnetic induction of the center axis of comparative example 1 was measured by the same test method as in example 1, as shown in fig. 15. The method basically has no uniform area, and the central magnetic field value is large and reaches: 1.5407 + -0.0077T, having a weight of about: 11.2 kg.
Example 2:
referring to fig. 16 and 17, a magnetic field generating device for a terahertz traveling wave tube comprises a magnetic yoke, a permanent magnet and a protective sleeve,
the magnetic yoke is of a thin-wall circular ring structure and is divided into a left magnetic yoke 2 and a right magnetic yoke 6 which are symmetrical;
the permanent magnet is in a special-shaped magnetic ring structure, and as shown in fig. 18-20, the special-shaped magnetic ring is divided into a left special-shaped magnetic ring 1 and a right special-shaped magnetic ring 5; the left special-shaped magnetic ring 1 is tightly attached to the inner surface of the left magnetic yoke 2 and is fixed in the middle of the left magnetic yoke 2; the right special-shaped magnetic ring 5 is tightly attached to the inner surface of the right magnetic yoke 6 and is fixed in the middle of the right magnetic yoke 6;
the protective sleeve is divided into a left protective sleeve and a right protective sleeve as shown in fig. 21-22; the left protective sleeve is divided into a left outer protective sleeve 3 and a left inner protective sleeve 4; the right protective sleeve is divided into a right outer protective sleeve 7 and a right inner protective sleeve 8; the left inner protective sleeve 4 and the left outer protective sleeve 3 are respectively fixed on two sides of the left special-shaped magnetic ring 1 to form a left magnetic system; the right inner protective sleeve 8 and the right outer protective sleeve 7 are respectively fixed on two sides of the right special-shaped magnetic ring 5 to form a right magnetic system; the left special-shaped magnetic ring 1 and the right special-shaped magnetic ring 5 are magnetized in the radial direction, have opposite polarities in the radial direction, and are coaxially centered and fixed;
in the embodiment, the left special-shaped magnetic ring 1 and the right special-shaped magnetic ring 5 are respectively formed by bonding 18 special-shaped sector magnets with 20-degree angles by adhesives and are respectively glued in the left magnetic yoke 2 and the right magnetic yoke 6, and the left inner protective sleeve 4, the left outer protective sleeve 3, the right inner protective sleeve 8 and the right inner protective sleeve 8 are respectively connected with the left magnetic yoke 2 and the right magnetic yoke 6 by screws and are fixed with the contact surfaces of the magnets by adhesives; the protective sleeves in the left magnetic system and the right magnetic system are fixed coaxially in a right-to-left mode, the left magnetic system and the right magnetic system are magnetized along the radial direction, the radial polarities are opposite, and the arrow direction in the figure 17 is the magnetization direction;
the shape structure of the permanent magnet of this embodiment is shown in fig. 18 and 19, the material is a high-performance sintered ndfeb permanent magnet, and the magnetic properties are as follows: residual magnetism Br: 13.6 ± 0.4kGs, coercivity Hcb: ≧ 976kA/m, intrinsic coercivity Hcj: 1592kA/m, magnetic energy product (BH) max: 350 ± 16kJ/m3, the magnetic induction of the central axis as shown in fig. 17 is measured, the magnetic field distribution of the central axis is as shown in fig. 23, the magnetic induction of the uniform region: 0.93405 ± 0.01105T, homogeneous zone length: 40mm, lifting zone distance: 23mm, homogeneous region magnetic induction uniformity: less than or equal to 1.2 percent, and the weight is as follows: 10.6 kg.
Example 3:
referring to fig. 24 and 25, a magnetic field generating device for a terahertz traveling wave tube is composed of a magnetic yoke, a permanent magnet and a protective sleeve,
the magnetic yoke is of a thin-wall circular ring structure and is divided into a left magnetic yoke 2 and a right magnetic yoke 6 which are symmetrical;
the permanent magnet is of a step magnetic ring structure, and as shown in fig. 26-28, the step magnetic ring is divided into a left step magnetic ring 1 and a right step magnetic ring 5; the left step magnetic ring 1 is tightly attached to the inner surface of the left magnetic yoke 2 and fixed in the middle of the left magnetic yoke 2; the right step magnetic ring 5 is tightly attached to the inner surface of the right magnetic yoke 6 and fixed in the middle of the right magnetic yoke 6;
the protective sleeve is divided into a left protective sleeve and a right protective sleeve as shown in fig. 29-30; the left protective sleeve is divided into a left outer protective sleeve 3 and a left inner protective sleeve 4; the right protective sleeve is divided into a right outer protective sleeve 7 and a right inner protective sleeve 8; the left inner protective sleeve 4 and the left outer protective sleeve 3 are respectively fixed on two sides of the left step magnetic ring 1 to form a left magnetic system; the right inner protective sleeve 8 and the right outer protective sleeve 7 are respectively fixed on two sides of the right step magnetic ring 5 to form a right magnetic system; the left step magnetic ring 1 and the right step magnetic ring 5 are magnetized in the radial direction, have opposite polarities in the radial direction, and are coaxially centered and fixed;
in the embodiment, the left step magnetic ring 1 and the right step magnetic ring 5 are respectively formed by bonding 18 20-degree fan-shaped magnets by adhesives and are respectively glued in the left magnetic yoke 2 and the right magnetic yoke 6, and the left inner protective sleeve 4, the left outer protective sleeve 3, the right inner protective sleeve 8 and the right outer protective sleeve 7 are respectively connected with the left magnetic yoke 2 and the right magnetic yoke 6 by screws and are fixed with the contact surfaces of the magnets by adhesives; the protective sleeves in the left magnetic system and the right magnetic system are fixed coaxially in a right-to-left mode, the left magnetic system and the right magnetic system are magnetized along the radial direction, the radial polarities are opposite, and the arrow direction in the graph 25 is the magnetization direction;
the shape structure of the permanent magnet of this embodiment is shown in fig. 24 and 25, the material is a high-performance sintered ndfeb permanent magnet, and the magnetic properties are as follows: residual magnetism Br: 13.6 ± 0.4kGs, coercivity Hcb: ≧ 976kA/m, intrinsic coercivity Hcj: 1592kA/m, magnetic energy product (BH) max: 350 ± 16kJ/m3, and the magnetic induction of the central axis as shown in fig. 25 is measured, the magnetic field distribution of the central axis is as shown in fig. 31, and the magnetic induction of the uniform region: 0.9795 ± 0.0137T, homogeneous zone length: 29mm, lifting zone distance: 13.6mm, homogeneous region magnetic induction uniformity: less than or equal to 1.4 percent, and the weight is as follows: 9.25 kg.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A terahertz is magnetic field generating device for travelling wave tube, its characterized in that: consists of a magnet yoke, a permanent magnet and a protective sleeve, wherein,
the magnetic yoke is of a thin-wall circular ring structure and is divided into a left magnetic yoke (2) and a right magnetic yoke (6) which are symmetrical;
the permanent magnet is of a special-shaped magnetic ring structure, and the special-shaped magnetic ring is divided into a left special-shaped magnetic ring (1) and a right special-shaped magnetic ring (5); the left special-shaped magnetic ring (1) is tightly attached to the inner surface of the left magnetic yoke (2) and is fixed with the left magnetic yoke (2); the right special-shaped magnetic ring (5) is tightly attached to the inner surface of the right magnetic yoke (6) and is fixed with the right magnetic yoke (6);
the protective sleeve is divided into a left protective sleeve and a right protective sleeve; the left protective sleeve is divided into a left outer protective sleeve (3) and a left inner protective sleeve (4); the right protective sleeve is divided into a right outer protective sleeve (7) and a right inner protective sleeve (8); the left inner protective sleeve (4) and the left outer protective sleeve (3) are respectively fixed on two sides of the left special-shaped magnetic ring (1) to form a left magnetic system; the right inner protective sleeve (8) and the right outer protective sleeve (7) are respectively fixed on two sides of the right special-shaped magnetic ring (5) to form a right magnetic system; the left special-shaped magnetic ring (1) and the right special-shaped magnetic ring (5) are magnetized in the radial direction, have opposite polarities in the radial direction, and are coaxially and centrally fixed.
2. The magnetic field generating device for the terahertz traveling-wave tube as set forth in claim 1, wherein: the left protective sleeve and the right protective sleeve are opposite in plane and fixed in inner hole centering, and an air gap is formed between the left inner protective sleeve (4) and the right inner protective sleeve (8).
3. The magnetic field generating device for the terahertz traveling-wave tube as set forth in claim 1, wherein: the permanent magnet is a rare earth cobalt permanent magnet or a neodymium iron boron permanent magnet; the magnetic yoke is made of soft magnetic alloy material; the protective sleeve is made of non-magnetic materials.
4. The magnetic field generating device for the terahertz traveling-wave tube as set forth in claim 1, wherein: the protective sleeve is fixedly connected with the permanent magnet through an adhesive, and the protective sleeve is connected with the magnetic yoke through a screw.
5. The magnetic field generating device for the terahertz traveling-wave tube as set forth in claim 1, wherein: the special-shaped magnetic ring is a non-regular magnetic ring and is an integral body.
6. The magnetic field generating device for the terahertz traveling-wave tube as set forth in claim 1, wherein: the special-shaped magnetic ring is composed of an irregular magnetic ring and a regular magnetic ring.
7. The magnetic field generating device for the terahertz traveling-wave tube as set forth in claim 6, wherein: the inner diameter of the irregular magnetic ring is of a conical surface structure, a step structure or an inclined surface structure.
8. The magnetic field generating device for the terahertz traveling-wave tube as set forth in claim 1, wherein: the special-shaped magnetic ring is formed by splicing a plurality of special-shaped sector magnets and sector magnets, or formed by splicing special-shaped sector magnets, or is an integral special-shaped magnetic ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020989556.9U CN212062052U (en) | 2020-06-03 | 2020-06-03 | Magnetic field generating device for terahertz traveling wave tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020989556.9U CN212062052U (en) | 2020-06-03 | 2020-06-03 | Magnetic field generating device for terahertz traveling wave tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212062052U true CN212062052U (en) | 2020-12-01 |
Family
ID=73513289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020989556.9U Active CN212062052U (en) | 2020-06-03 | 2020-06-03 | Magnetic field generating device for terahertz traveling wave tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212062052U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111554468A (en) * | 2020-06-03 | 2020-08-18 | 中国电子科技集团公司第九研究所 | Magnetic field generating device for terahertz traveling wave tube |
| CN114267516A (en) * | 2021-12-02 | 2022-04-01 | 电子科技大学 | Method for enabling natural magnetic material to have obvious terahertz magnetic permeability |
-
2020
- 2020-06-03 CN CN202020989556.9U patent/CN212062052U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111554468A (en) * | 2020-06-03 | 2020-08-18 | 中国电子科技集团公司第九研究所 | Magnetic field generating device for terahertz traveling wave tube |
| CN111554468B (en) * | 2020-06-03 | 2024-09-03 | 中国电子科技集团公司第九研究所 | Magnetic field generating device for terahertz traveling wave tube |
| CN114267516A (en) * | 2021-12-02 | 2022-04-01 | 电子科技大学 | Method for enabling natural magnetic material to have obvious terahertz magnetic permeability |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212062052U (en) | Magnetic field generating device for terahertz traveling wave tube | |
| US4701737A (en) | Leakage-free, linearly varying axial permanent magnet field source | |
| JPS6359243B2 (en) | ||
| CN109831084A (en) | The built-in double V-shaped series-parallel adjustable flux permanent magnet synchronous motor of mixed magnetic circuit | |
| GB666907A (en) | Improvements in and relating to cathode ray tubes | |
| CN110600352B (en) | Electron optical system suitable for ribbon beam traveling wave tube | |
| CN111322214B (en) | Low-thrust radio frequency ion thruster for cusp field | |
| CN111554468A (en) | Magnetic field generating device for terahertz traveling wave tube | |
| CN113270304B (en) | Multi-electron beam traveling wave tube with axisymmetric folding waveguide high-frequency slow wave structure | |
| CN214753634U (en) | Multi-electron traveling wave tube with axisymmetric folded waveguide high-frequency slow-wave structure | |
| CN107895719B (en) | Adjustable high-impedance miniaturized high-voltage diode | |
| US4602232A (en) | Electromagnetic drive unit | |
| CN104409301B (en) | A kind of axially event-free survival compound guiding field system | |
| CN104575478A (en) | Driving element and rare-earth magnetostrictive transducer comprising same | |
| CN215990333U (en) | Wireless charging electromagnetic positioning structure, wireless charging module and wireless charger | |
| US3283200A (en) | High frequency electron discharge device having improved permanent magnetic focusing | |
| CN216719862U (en) | Axisymmetric staggered double-grid high-frequency slow-wave structure | |
| CN221446905U (en) | Halbach array type neodymium-iron-boron magnet structure | |
| CN204155899U (en) | A kind of axial event-free survival compound guiding field system | |
| CN115295377B (en) | Permanent magnet focusing system of microwave device | |
| CN111383873A (en) | Novel adjustable magnetic focusing system suitable for ribbon traveling wave tube | |
| CN113470923B (en) | Four-ring type focusing magnetic field device with high residual magnetism utilization rate | |
| CN109166779A (en) | A kind of relativistic magnetron permanent magnetic circuit system | |
| CN111584181A (en) | Constant magnetic field structure | |
| CN2337734Y (en) | Discrete driving radial moving-coil loudspeaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |