CN107093538A - Smith's Pa Saier electromagnetic radiation sources based on two sections of rectangular rasters - Google Patents
Smith's Pa Saier electromagnetic radiation sources based on two sections of rectangular rasters Download PDFInfo
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- CN107093538A CN107093538A CN201710347815.0A CN201710347815A CN107093538A CN 107093538 A CN107093538 A CN 107093538A CN 201710347815 A CN201710347815 A CN 201710347815A CN 107093538 A CN107093538 A CN 107093538A
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- Prior art keywords
- flat metal
- smith
- rectangular
- radiation
- purcell
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Classifications
-
- 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
- H01J23/027—Collectors
-
- 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
- H01J23/06—Electron or ion guns
-
- 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
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/18—Resonators
- H01J23/20—Cavity resonators; Adjustment or tuning thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2223/00—Details of transit-time tubes of the types covered by group H01J2225/00
- H01J2223/02—Electrodes; Magnetic control means; Screens
- H01J2223/027—Collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2223/00—Details of transit-time tubes of the types covered by group H01J2225/00
- H01J2223/02—Electrodes; Magnetic control means; Screens
- H01J2223/06—Electron or ion guns
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2223/00—Details of transit-time tubes of the types covered by group H01J2225/00
- H01J2223/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J2223/18—Resonators
- H01J2223/20—Cavity resonators; Adjustment or tuning thereof
Abstract
The invention discloses a kind of Smith's Pa Saier electromagnetic radiation sources based on two sections of rectangular rasters, including produce electron gun, large scale flat metal rectangular raster, small size flat metal rectangular raster and the collector of rectangular strip shape electronics note；Electron gun is corresponding with collector, large scale flat metal rectangular raster and small size flat metal rectangular raster are placed sequentially in electron gun between collector, and the distance that the upper surface of large scale flat metal rectangular raster and small size flat metal rectangular raster is noted to the rectangular strip shape electronics is equal；The rectangular strip shape electronics note that electron gun is produced at the uniform velocity in turn skims over the upper surface of the large scale flat metal rectangular raster and small size flat metal rectangular raster, finally enters collector.Compared with traditional Smith Purcell free-electron lasers, Smith Purcell free-electron lasers can be made to be operated in higher order harmonics, radiation frequency improves 2 to 3 times.
Description
Technical field
The present invention relates to the vacuum electronics technology in a kind of electromagnetism, more particularly to a kind of history based on two sections of rectangular rasters
Mi Si-Pa Saier electromagnetic radiation sources.
Background technology
Wavelength millimeter or submillimeter magnitude, frequency terahertz wave band electromagnetic wave in life science, material science, height
The numerous areas such as speed communication and national security has broad application prospects, and is the heat of current domestic and international researcher common concern
Point research topic.The electromagnetic radiation source of this wave band is the basis for developing Terahertz Technology.
Or work on hand is extremely low (Solid Source that such as frequency multiplication is realized) in the electromagnetic radiation source power efficiency of the frequency range, or
Process extremely difficult (such as traditional vacuum electronics cosmogony), otherwise equipment and its complexity, cost are high (including based on optical difference frequency
Radiation source, traditional free-electron laser based on undulator and circulating electrons master etc.).
The Smith-Purcell of relevant Smith-Purcell radiation effects of grating generation is encouraged based on charged particle certainly
It is to be expected to develop into the important electromagnetic radiation source for being operated in Terahertz frequency range by electronic laser.
In the prior art, traditional Smith-Purcell free-electron lasers, using continuous electronic note on optical grating construction surface
With the interaction of reverse slow wave, continuous electronic note is occurred clustering, form the electron cloud of series of periodic arrangement, these electricity
Son group produces relevant Smith-Purcell radiation in grating surface, and radiation frequency is the positive integer times of electron cloud clustering frequency, i.e.,
Harmonic wave.Radiation intensity drastically declines with the raising of frequency multiple, therefore, and traditional Smith-Purcell free-electron lasers lead to
The electromagnetic radiation that frequency is clustering frequency twice (i.e. second harmonic) can only often be produced.Radiation frequency is relatively inaccessible to preferable terahertz
Hereby frequency range, i.e. radiation frequency are in 0.3THz even more than 0.5THz.
On the other hand, existing Smith-Purcell free-electron lasers are based on common Smith-Purcell spokes
Penetrate.Theoretical and numerical simulation shows, by adjusting electronics note and grating parameter, can obtain a species specific Smith-
Purcell is radiated.The core difference that it is radiated with common Smith-Purcell is：For common Smith-Purcell spokes
Penetrate, electronics note has mainly encouraged the slow electromagnetic wave of grating surface and interacted therewith, and the radiated wave excited is diffused on grating
The all directions of half space, and the radiation frequency in each direction is different；And radiated for special Smith-Purcell, electronics note
Radiated wave can only have been encouraged and interacted therewith, its radiation frequency is specific with direction, and radiation frequency and direction can be with
Note speed by adjusting optical grating construction and electronics and determine.The radiation intensity of special Smith-Purcell radiation is than common Smith-
The high nearly an order of magnitude of Purcell radiation intensity.This is the present invention setting out using relevant special Smith-Purcell radiation
Point.
The content of the invention
It is an object of the invention to provide a kind of Smith's-Pa Saier electromagnetic radiation sources based on two sections of rectangular rasters.
The purpose of the present invention is achieved through the following technical solutions：
Smith's-Pa Saier electromagnetic radiation sources based on two sections of rectangular rasters of the present invention, including produce rectangular strip shape electricity
Electron gun, large scale flat metal rectangular raster, small size flat metal rectangular raster and the collector of son note；
The electron gun is corresponding with collector, the large scale flat metal rectangular raster and small size flat metal square
Shape grating is placed sequentially in electron gun between collector, the large scale flat metal rectangular raster and small size flat metal
The distance that the upper surface of rectangular raster is noted to the rectangular strip shape electronics is equal；
The rectangular strip shape electronics note that the electron gun produces at the uniform velocity in turn skims over the large scale flat metal rectangular light
The upper surface of grid and small size flat metal rectangular raster, finally enters the collector；
The rectangular strip shape electronics note interacts on the large scale flat metal rectangular raster surface and reverse slow wave,
And then electron bunching is produced, the electron cloud of series of periodic arrangement is formed, these electron clouds produce what is be concerned with grating surface
Common Smith-Purcell radiation, radiation frequency is the positive integer times of electron cloud clustering frequency, when these electron clouds enter institute
When stating small size flat metal rectangular raster surface, small size flat metal rectangular raster produces special Smith-Purcell spokes
Penetrate, radiation frequency is also the positive integer times of electron cloud clustering frequency, what the large scale flat metal rectangular raster surface was produced
Relevant common Smith-Purcell radiation energies produce the electromagnetic radiation of twice clustering frequency, the small size flat metal square
The special Smith-Purcell radiation energies of shape grating produce five times even six times of electromagnetic radiation.
As seen from the above technical solution provided by the invention, it is provided in an embodiment of the present invention to be based on two sections of rectangular rasters
Smith's-Pa Saier electromagnetic radiation sources, compared with traditional Smith-Purcell free-electron lasers, Smith- can be made
Purcell free-electron lasers are operated in higher order harmonics, and radiation frequency improves 2 to 3 times.
Brief description of the drawings
Fig. 1 is the two of Smith's-Pa Saier electromagnetic radiation sources provided in an embodiment of the present invention based on two sections of rectangular rasters
Dimension module structural representation.
Fig. 2 obtains the electric field frequency spectrum on small size flat metal rectangular raster surface for emulation in the embodiment of the present invention.
Fig. 3 obtains 5 subharmonic spokes of small size flat metal rectangular raster upper half-space for emulation in the embodiment of the present invention
Radio time-domain diagram and its comparison with traditional Smith-Purcell free-electron lasers.
In figure：
1 electron gun, 2 ribbon-like electrons note, 3 collectors, 4 large scale metal rectangular gratings, 5 small sized metallic rectangular rasters, 6
Special Smith-Purcell radiation.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to protection scope of the present invention.
Smith's-Pa Saier electromagnetic radiation sources based on two sections of rectangular rasters of the present invention, its preferably specific embodiment party
Formula is：
Electron gun, large scale flat metal rectangular raster, small size flat metal including producing rectangular strip shape electronics note
Rectangular raster and collector；
The electron gun is corresponding with collector, the large scale flat metal rectangular raster and small size flat metal square
Shape grating is placed sequentially in electron gun between collector, the large scale flat metal rectangular raster and small size flat metal
The distance that the upper surface of rectangular raster is noted to the rectangular strip shape electronics is equal；
The rectangular strip shape electronics note that the electron gun produces at the uniform velocity in turn skims over the large scale flat metal rectangular light
The upper surface of grid and small size flat metal rectangular raster, finally enters the collector；
The rectangular strip shape electronics note interacts on the large scale flat metal rectangular raster surface and reverse slow wave,
And then electron bunching is produced, the electron cloud of series of periodic arrangement is formed, these electron clouds produce what is be concerned with grating surface
Common Smith-Purcell radiation, radiation frequency is the positive integer times of electron cloud clustering frequency, when these electron clouds enter institute
When stating small size flat metal rectangular raster surface, small size flat metal rectangular raster produces special Smith-Purcell spokes
Penetrate, radiation frequency is also the positive integer times of electron cloud clustering frequency, what the large scale flat metal rectangular raster surface was produced
Relevant common Smith-Purcell radiation energies produce the electromagnetic radiation of twice clustering frequency, the small size flat metal square
The special Smith-Purcell radiation energies of shape grating produce five times even six times of electromagnetic radiation.
Described special Smith-Purcell radiation is produced by the radiation wave interaction of at the uniform velocity charged particle and grating
Raw is coherent radiation, what its radiation frequency was to determine with direction.
Described special Smith-Purcell radiation is at the uniform velocity in principle by the mode of resonance in the rectangular channel of grating
Each rectangular channel in the radiation being sequentially generated under the exciting of charged particle, grating is an open resonator, that is to say one
Individual radiating element, a series of array of whole open resonant cavity formation of optical grating constitution.
The high number of the common Smith-Purcell radiation intensity of strength ratio of described special Smith-Purcell radiation
Magnitude.
The embodiment of the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention produces the enhanced special Smith- that is concerned with using rectangular strip shape electronics note two sections of rectangular rasters of excitation
The light source technology of Purcell radiation, conceptual scheme is as shown in Figure 1：
Electron gun, large scale flat metal rectangular raster, small size flat metal including producing rectangular strip shape electronics note
Rectangular raster and collector；Electron gun is corresponding with collector, large scale flat metal rectangular raster and small size flat metal
Rectangular raster is placed sequentially between electron gun and collector；The distance phase that the upper surface of two metal rectangular gratings is noted to electronics
Deng；The at the uniform velocity rectangular strip shape electronics note that electron gun is produced in turn skims over large scale flat metal rectangular raster and small size flat board
The surface of metal rectangular grating, finally enters collector；Rectangular strip shape electronics is noted on large scale flat metal rectangular raster surface
Interacted with reverse slow wave, and then produce electron bunching, form the electron cloud of series of periodic arrangement, these electron clouds exist
Grating surface produces relevant common Smith-Purcell radiation, and radiation frequency is the positive integer times of electron cloud clustering frequency.When
When these electron clouds enter small size flat metal rectangular raster surface, small size flat metal rectangular raster produces special
Smith-Purcell is radiated, and radiation frequency is also the positive integer times of electron cloud clustering frequency, and it is with large scale flat metal rectangle
Unlike the relevant common Smith-Purcell radiation that grating surface is produced, common Smith-Purcell radiation is (i.e. traditional
Smith-Purcell free-electron lasers) it can only produce the electromagnetic radiation of twice clustering frequency, and small size flat metal square
The special Smith-Purcell radiation of shape grating can produce the electromagnetic radiation of more high magnification numbe frequency (five times even six times), because
And radiation frequency can be significantly improved.
Wherein, described special Smith-Purcell radiation is the radiated wave phase interaction by the uniform velocity charged particle and grating
With and produce is coherent radiation, what its radiation frequency and direction were to determine.
Wherein, on described special Smith-Purcell radiation theories existed by the mode of resonance in the rectangular channel of grating
Each rectangular channel in the radiation being at the uniform velocity sequentially generated under the exciting of charged particle, grating is an open resonator, namely
It is a radiating element, a series of array of whole open resonant cavity formation of optical grating constitution.
Wherein, the common Smith-Purcell radiation intensity of strength ratio of described special Smith-Purcell radiation is high near
An order of magnitude.
The invention has the advantages that：
Radiation frequency is higher；
Compared with traditional Smith-Purcell free-electron lasers, the present invention can make Smith-Purcell free electrons
Laser work is in higher order harmonics, and radiation frequency improves 2 to 3 times.
Radiant power is of a relatively high：
Compared with traditional Smith-Purcell free-electron lasers, the radiation intensity that the present invention goes out in higher harmonic components
Significantly increase.
Compact conformation and easily realization：
The present invention it is simple in construction, it is desirable to operating voltage it is low, it is not necessary to huge external add-in equipment, easily realize miniaturization
With it is integrated.
Specific embodiment：
It is given below to optimize obtained specific implementation parameter of the invention and simulation result.Large scale flat metal rectangular light
Grid：Gap width 0.45mm between screen periods 0.9mm, grating broach, grating broach depth 0.45mm；Small size flat metal square
Shape grating：Gap width 0.05mm between screen periods 0.35mm, grating broach, grating broach depth 0.1mm；Electronics note accelerates electricity
80 kilovolts of pressure, the Amperes per square centimeter of current density 50, the thickness that electronics notes in x directions is 0.1mm.Fig. 2 shows that small size is put down
(2,3,4 times humorous for the strength ratio low-order harmonic for 5 subharmonic (frequency is 0.491THz) that the surface actuator of sheetmetal rectangular raster rises
Ripple) intensity it is stronger, illustrate that it can be with driving frequency with high electromagnetic radiation；The small size flat metal that Fig. 3 obtains for emulation
5 subharmonic radiated electric field time-domain diagrams of rectangular raster upper half-space, it can be seen that this programme is than traditional Smith-Purcell certainly
4 to 5 times are improved by the radiation field intensity of electronic laser model, that is to say, that radiant power improves about 20 times.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (4)
1. a kind of Smith's-Pa Saier electromagnetic radiation sources based on two sections of rectangular rasters, it is characterised in that including producing rectangular band
Electron gun, large scale flat metal rectangular raster, small size flat metal rectangular raster and the collector of shape electronics note；
The electron gun is corresponding with collector, the large scale flat metal rectangular raster and small size flat metal rectangular light
Grid are placed sequentially in electron gun between collector, the large scale flat metal rectangular raster and small size flat metal rectangle
The distance that the upper surface of grating is noted to the rectangular strip shape electronics is equal；
The rectangular strip shape electronics note that the electron gun is produced at the uniform velocity in turn skim over the large scale flat metal rectangular raster and
The upper surface of small size flat metal rectangular raster, finally enters the collector；
The rectangular strip shape electronics note interacts on the large scale flat metal rectangular raster surface and reverse slow wave, and then
Electron bunching is produced, the electron cloud of series of periodic arrangement is formed, these electron clouds produce relevant common in grating surface
Smith-Purcell radiate, radiation frequency be electron cloud clustering frequency positive integer times, when these electron clouds enter it is described small
During size flat-panel metal rectangular grating surface, small size flat metal rectangular raster produces special Smith-Purcell radiation, spoke
Radio frequency rate is also the positive integer times of electron cloud clustering frequency, and it is relevant general that the large scale flat metal rectangular raster surface is produced
Logical Smith-Purcell radiation energies produce the electromagnetic radiation of twice clustering frequency, the small size flat metal rectangular raster
Special Smith-Purcell radiation energies produce five times of even six times of electromagnetic radiation.
2. Smith's-Pa Saier electromagnetic radiation sources according to claim 1 based on two sections of rectangular rasters, its feature exists
In described special Smith-Purcell radiation is produced by the radiation wave interaction of at the uniform velocity charged particle and grating
It is coherent radiation, what its radiation frequency was to determine with direction.
3. Smith's-Pa Saier electromagnetic radiation sources according to claim 2 based on two sections of rectangular rasters, its feature exists
In described special Smith-Purcell radiation is at the uniform velocity powered in principle by the mode of resonance in the rectangular channel of grating
Each rectangular channel in the radiation being sequentially generated under the exciting of particle, grating is an open resonator, that is to say a spoke
Penetrate unit, a series of array of whole open resonant cavity formation of optical grating constitution.
4. Smith's-Pa Saier electromagnetic radiation sources according to claim 3 based on two sections of rectangular rasters, its feature exists
In common high an order of magnitude of Smith-Purcell radiation intensity of strength ratio that described special Smith-Purcell is radiated.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258574A (en) * | 2018-01-15 | 2018-07-06 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and method for radiating |
| CN108471039A (en) * | 2018-04-02 | 2018-08-31 | 电子科技大学 | A kind of optical grating construction for generating millimeter wave and terahertz emission |
| CN108550509A (en) * | 2018-05-21 | 2018-09-18 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and electromagenetic wave radiation method |
| CN109916862A (en) * | 2019-02-27 | 2019-06-21 | 北京大学 | A kind of enhancing polychrome is concerned with SPR device and its control method |
| CN110137781A (en) * | 2019-05-07 | 2019-08-16 | 电子科技大学 | A kind of surface wave is converted into the optical grating construction of Smith-Purcell radiation |
| CN110444996A (en) * | 2019-07-05 | 2019-11-12 | 清华大学 | Relevant Smith-Purcell irradiation device and relevant THz radiation signal generating method |
| CN110994335A (en) * | 2019-11-05 | 2020-04-10 | 中国科学技术大学 | Device, method and device for generating terahertz radiation based on Smith-Purcell effect |
| CN111799640A (en) * | 2020-06-24 | 2020-10-20 | 清华大学 | Terahertz radiator based on stimulated amplification coherent SPR radiation |
| CN113013003A (en) * | 2021-03-23 | 2021-06-22 | 东南大学 | Free electron laser system of dielectric grating based on dielectric waveguide coupling |
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Cited By (15)
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| CN108258574A (en) * | 2018-01-15 | 2018-07-06 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and method for radiating |
| CN108258574B (en) * | 2018-01-15 | 2019-11-22 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and method for radiating |
| CN108471039A (en) * | 2018-04-02 | 2018-08-31 | 电子科技大学 | A kind of optical grating construction for generating millimeter wave and terahertz emission |
| CN108550509B (en) * | 2018-05-21 | 2019-10-25 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and electromagenetic wave radiation method |
| CN108550509A (en) * | 2018-05-21 | 2018-09-18 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and electromagenetic wave radiation method |
| CN109916862B (en) * | 2019-02-27 | 2020-06-02 | 北京大学 | Enhanced multicolor coherent SPR device and control method thereof |
| CN109916862A (en) * | 2019-02-27 | 2019-06-21 | 北京大学 | A kind of enhancing polychrome is concerned with SPR device and its control method |
| CN110137781A (en) * | 2019-05-07 | 2019-08-16 | 电子科技大学 | A kind of surface wave is converted into the optical grating construction of Smith-Purcell radiation |
| CN110444996A (en) * | 2019-07-05 | 2019-11-12 | 清华大学 | Relevant Smith-Purcell irradiation device and relevant THz radiation signal generating method |
| CN110444996B (en) * | 2019-07-05 | 2020-08-21 | 清华大学 | Coherent Smith-Purcell radiation device and coherent THz radiation signal generation method |
| CN110994335A (en) * | 2019-11-05 | 2020-04-10 | 中国科学技术大学 | Device, method and device for generating terahertz radiation based on Smith-Purcell effect |
| CN110994335B (en) * | 2019-11-05 | 2021-12-10 | 中国科学技术大学 | Device, method and device for generating terahertz radiation based on Smith-Purcell effect |
| CN111799640A (en) * | 2020-06-24 | 2020-10-20 | 清华大学 | Terahertz radiator based on stimulated amplification coherent SPR radiation |
| CN113013003A (en) * | 2021-03-23 | 2021-06-22 | 东南大学 | Free electron laser system of dielectric grating based on dielectric waveguide coupling |
| CN113013003B (en) * | 2021-03-23 | 2023-08-18 | 东南大学 | Free electron laser system of dielectric grating based on dielectric waveguide coupling |
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