CN205881866U - Take axial virtual cathode oscillator in magnetic field - Google Patents
Take axial virtual cathode oscillator in magnetic field Download PDFInfo
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- CN205881866U CN205881866U CN201620687079.4U CN201620687079U CN205881866U CN 205881866 U CN205881866 U CN 205881866U CN 201620687079 U CN201620687079 U CN 201620687079U CN 205881866 U CN205881866 U CN 205881866U
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- microwave radiation
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Abstract
The utility model discloses a take axial virtual cathode oscillator in magnetic field, comprises an anode, the negative pole, the insulator, anode screen, low guide magnetic field produces device and microwave radiation window, be provided with the cathode emission district on the negative pole, transmission electronic material in cathode emission district generally is the velveteen, anode and cathode carries out the electrical isolation through the insulator, the microwave radiation window sets up on the positive pole, be provided with anode screen between negative pole and the microwave radiation window, be provided with a little wave transmission chamber between anode screen and the microwave radiation window, the positive pole, the negative pole, the insulator constitutes the vacuum cavity with the microwave radiation window, vacuum is no longer than 10 milli handkerchiefs. The utility model discloses can avoid passing through the little interference of waves of high power that the electron pair virtual cathode produced, the reflection electron of virtual cathode can carry out the vibration between virtual cathode and the true negative pole under the effect in guide magnetic field, effectively improve virtual cathode output efficiency many times. The virtual cathode can be stable in a certain position under low guide magnetic field for virtual cathode oscillator output frequence can be stable, single.
Description
Technical field
This utility model relates to high-power pulsed ion beams technical field, and the axial virtual cathode being specifically related to a kind of band magnetic field shakes
Swing device.
Background technology
High-Power Microwave refer to frequency in 1～300GHz scope and peak power at the electromagnetic wave of more than 100MW.Along with arteries and veins
Rushing the development of power technology and plasma physics, High-Power Microwave technology also develops by leaps and bounds, especially at high power
The development aspect of microwave source achieves progress greatly, successively occurs in that wide variety of different types of high-power microwave source.Empty cloudy
Pole agitator is one of important research direction of high-power microwave source, receives the highest in more than the 20 year time in past
Degree is paid attention to and widely studied.
Virtual Cathode Oscillators is totally different from common microwave source, because it needs one exceedes space-charge-limited flow
Electric current.Space-charge-limited flow refers to such a electric current, and when injection current exceedes this electric current, electrostatic potential energy exceedes electronics
The kinetic energy of bundle, therefore, electron reflection, reflection electronic are vibrated between real negative electrode and virtual cathode by virtual cathode, and this referred to as reflects machine
System.The virtual cathode that Virtual Cathode Oscillators produces is unstable, and its position and gesture value are also vibrated.Both mechanism can produce frequency
Approximately equalised microwave radiation.Compared with other microwave sources, Virtual Cathode Oscillators has concept and advantages of simple structure and simple.It produces
Raw High-Power Microwave, and easily tune, because it depends on that charge density does not relies on any condition of resonance.
Virtual Cathode Oscillators is a kind of space charge device, and under high voltage, the strong current electron beam of emission of cathode passes through anode network
It is injected in drift tube, owing to electronics has strong space charge effect, only less than the electron beam of space-charge-limited flow intensity
Transmission that can be stable.When electronic beam current exceedes the intensity of space charge limited current, electron beam potential energy in potential well
Will be increased to be enough to offset the kinetic energy that electron institute has, cause beam electrons to be formed in a large amount of clustering in certain position in anode downstream
Virtual cathode.Virtual cathode form the continuation transmission that on the one hand will stop electronics, partially reflective incident electron, reflection electronic leads to
Being returned to by the effect of true negative electrode again after crossing anode network, then reflection electronic is formed anti-between real negative electrode and virtual cathode
Penetrate mechanism vibration, produce microwave radiation；On the other hand the return of electronics makes gesture value at virtual cathode reduce, and electron beam can transmit again,
In turn result in gesture value to increase, continue to stop the further transmission of electronics, make the self-position of virtual cathode and gesture value all shake
Swing, produce electromagnetic radiation.
The formation and development of conventional axial virtual cathode is a unstable kinematic nonlinearity process: on the one hand, it has one
The individual nagative potential being substantially the same anode with negative electrode, therefore the electronics in virtual cathode district to reflect back to anode, and these reflect electricity
Son arrives near negative electrode through anode, is pushed back by negative electrode is counter again, postbacks and be reflected towards external radiation microwave, here it is people institute is ripe
The electron reflection known produces the mechanism of microwave；On the other hand, after electronics is reflected back, the electron number densitiy in virtual cathode district is little
, electromotive force to change, and the position of potential well also to change, and meanwhile, the electronics of true emission of cathode is the most constantly given empty cloudy
Extremely supplement electronics so that virtual cathode district electron number densitiy increases to be liked, thus causes the current potential of virtual cathode and position all to change,
Form concussion from macroscopically will appear as virtual cathode with room and time, thus encourage microwave radiation, here it is virtual cathode self
Vibration produces the mechanism of microwave.So, Virtual Cathode Oscillators is that the Space-time oscillating by virtual cathode itself and electronics are at virtual cathode
With two kinds of mechanism of the roundtrip between negative electrode produce microwave jointly.General virtual cathode bundle ripple conversion efficiency is 5%～10%, turns
Change efficiency comparison low.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, it is provided that one make output frequency more stable and
The axial Virtual Cathode Oscillators in the band magnetic field of bundle ripple conversion efficiency can be effectively improved.
The purpose of this utility model is achieved through the following technical solutions: the axial oscillation of virtual cathode in a kind of band magnetic field
Device, it includes anode, negative electrode, insulator, anode network, low guiding magnetic field generation device and microwave radiation window, negative electrode is provided with
Cathode emission area, in negative electrode is arranged on anode and is separated by insulator, and microwave radiation window is arranged on anode, negative electrode and microwave
It is provided with anode network between rediation aperture, between anode network and microwave radiation window, is provided with a microwave transmission chamber, anode, negative electrode, absolutely
Edge body constitutes vacuum chamber with microwave radiation window, and the vacuum of vacuum chamber is less than 10 millipascal.Arranging low guiding magnetic field, virtual cathode exists
Can be stable in a certain position under low guiding the action of a magnetic field so that Virtual Cathode Oscillators output frequency can be stable, single.Virtual cathode
Transmitted electron can focus on anode under the effect guiding magnetic field, quickly forms current loop, it is to avoid transmitted electron is to virtual cathode
The interference of the High-Power Microwave produced, is effectively improved Virtual Cathode Oscillators microwave delivery efficiency.
It is preferred that, described negative electrode is arranged in one end of anode, and the other end of anode arranges microwave radiation window.
It is preferred that, it is outer to produce axially directed magnetic field that described low guiding magnetic field generation device is looped around anode.
Arranging an axial low guiding magnetic field, due to the existence in axial low guiding magnetic field, the transmitted electron of virtual cathode can guide magnetic field
Focus on anode under effect, quickly form current loop, it is to avoid the transmitted electron interference to the High-Power Microwave that virtual cathode produces；
The reflection electronic of virtual cathode can carry out the vibration between virtual cathode repeatedly and true negative electrode under the effect guiding magnetic field, makes electricity
The energy of son bundle is more converted to microwave, is effectively improved virtual cathode delivery efficiency.Therefore virtual cathode is in axial low guiding magnetic field
Effect is lower can be stable in a certain position so that Virtual Cathode Oscillators output frequency can be stable, single, uses downfield axially empty cloudy
Pole technology can make virtual cathode microwave delivery efficiency reach 20%, greatly improves the range of application of Virtual Cathode Oscillators.
It is preferred that, described low guiding magnetic field generation device is positioned close to the position of anode network.
It is preferred that, described low guiding magnetic field generation device is alive solenoid coil.This line solenoid
Enclose the least on the overall dimensions of Virtual Cathode Oscillators and the impact of weight, thus can ensure that axial Virtual Cathode Oscillators structure is tight
Gather, simple feature.
It is preferred that, the magnetic field intensity in described axially directed magnetic field is less than 0.5T.It is applied on virtual cathode
Axially directed magnetic field intensity is less than 0.5T, and this relatively low guiding magnetic field can be produced by the solenoid coil of alive small volume
Raw.
It is preferred that, described anode network electron beam transmitance is more than 90%.
It is preferred that, the axial distance between described cathode emission area and anode network is 25mm～35mm.
It is preferred that, the voltage between described anode and negative electrode is 600kV, and electric current is 15kA, guides magnetic field strong
Degree for 0.3T, microwave transmission intracavity between anode network and microwave radiation window distance 26mm～36mm after being positioned at anode network
Position stably forms virtual cathode.Owing to the distance between virtual cathode and true negative electrode is shorter, the reflection electronic of virtual cathode can draw
Carry out the vibration between virtual cathode repeatedly and true negative electrode under the effect of magnetic conduction field, make the energy of electron beam more be converted to
Microwave, is effectively improved virtual cathode delivery efficiency.
It is preferred that, the material of described microwave radiation window is politef.
The beneficial effects of the utility model are: this utility model is due to the existence in low guiding magnetic field, the transmission electricity of virtual cathode
Son can focus on anode under the effect guiding magnetic field, quickly forms current loop, it is to avoid virtual cathode is produced by transmitted electron
The interference of High-Power Microwave；The virtual cathode that the reflection electronic of virtual cathode can be carried out repeatedly under the effect guiding magnetic field is cloudy with true
Vibration between pole, makes the energy of electron beam more be converted to microwave, is effectively improved virtual cathode delivery efficiency.Virtual cathode is low
Guiding can be stable in a certain position under the action of a magnetic field so that Virtual Cathode Oscillators output frequency can be stable, single.Use low guiding
Magnetic field virtual cathode technology can make virtual cathode microwave delivery efficiency reach 20%, greatly improves the range of application of Virtual Cathode Oscillators.
Accompanying drawing explanation
Fig. 1 is this utility model structural representation；
In figure, 1-insulator, 2-negative electrode, 3-low guiding magnetic field generation device, 4-anode network, 5-virtual cathode, 6-anode, 7-
Microwave radiation window, 8-strong current electron beam, 9-reflection electronic, 10-transmitted electron, the 11-magnetic line of force.
Detailed description of the invention
The technical solution of the utility model is described in further detail below in conjunction with the accompanying drawings, but protection domain of the present utility model
It is not limited to the following stated.
As it is shown in figure 1, the axial Virtual Cathode Oscillators in a kind of band magnetic field, it includes anode 6, negative electrode 2, insulator 1, anode
6 nets 4, low guiding magnetic field generation device 3 and microwave radiation window 7, negative electrode 2 is provided with negative electrode 2 launch site, its electronic emission material
Preferably velveteen, its effect is to produce axial strong current electron beam 8, separates, insulation in negative electrode 2 is arranged on anode 6 and by insulator 1
The preferred nylon of material of body 1, the effect of insulator 1 is to be dielectrically separated from device anode and cathode 6, and microwave radiation window 7 is arranged on
On anode 6, being provided with anode 6 net 4 between negative electrode 2 and microwave radiation window 7, the effect of anode 6 net 4 is to guide negative electrode 2 to launch by force
Stream electron beam 8, is provided with a microwave transmission chamber between anode 6 net 4 and microwave radiation window 7, anode 6, negative electrode 2, insulator 1 are with micro-
Wave radiating window 7 constitutes vacuum chamber, and the vacuum of vacuum chamber is less than 10 millipascal, vacuum preferably 1～10 millipascal.
Preferably, described negative electrode 2 is arranged in one end of anode 6, and the other end of anode 6 arranges microwave radiation window 7.
Preferably, it is outer to produce axially directed magnetic field that described low guiding magnetic field generation device 3 is looped around anode 6.
Preferably, described low guiding magnetic field generation device 3 is positioned close to the position of anode 6 net 4.
Preferably, described low guiding magnetic field generation device 3 is alive solenoid coil.
Preferably, the magnetic field intensity in described axially directed magnetic field is less than 0.5T.
Preferably, described anode 6 net 4 electron beam transmitance requires more than 90%.
Preferably, the axial distance between described negative electrode 2 launch site and anode 6 net 4 is 25mm～35mm.
Preferably, the voltage between described anode 6 and negative electrode 2 is 600kV, and electric current is 15kA, and guiding magnetic field intensity is
0.3T, microwave transmission intracavity between anode 6 net 4 and microwave radiation window 7 is also positioned at distance 26mm～36mm after anode 6 net 4
Position stably form virtual cathode 5.This virtual cathode 5 is formed by space current (or strong current electron beam 8).
Preferably, the material of described microwave radiation window 7 is politef.
Further illustrating of reference: reference 8 is the strong current electron beam 8 that negative electrode 2 is launched, its in axial magnetic field and
Under the guiding of anode 6 net 4, enter bundle ripple switch region through anode 6 net 4, and form virtual cathode 5 and vibrate, produce High-Power Microwave；
Reference 9 is the reflection electronic 9 of virtual cathode 5；Reference 10 is the transmitted electron 10 of virtual cathode 5；11 is solenoid coil
The magnetic line of force 11 in the axially directed magnetic field produced.
The process that is preferable to carry out of the present utility model: vacuum in virtual cathode 5 agitator is processed with vacuum acquirement device
Millipascal magnitude.Between anode and cathode 6, applying high voltage is to 600kV, when voltage strength reaches the electron emission threshold of negative electrode 2 material
Time, velveteen negative electrode 2 transmitting produces axial strong current electron beam 8, and beam intensity is 15kA, and guiding magnetic field intensity is 0.3T.Anode 6 net
4 electron beam transmitances are more than 90%, and the axial distance between negative electrode 2 launch site and anode 6 net 4 is 29mm, and strong current electron beam 8 exists
Under the guiding in anode 6 net 4 and axially directed magnetic field, axially transmission, through anode 6 net 4, and forms virtual cathode 5 and vibrates, and electron beam will
Energy gives microwave field, produces High-Power Microwave.Due to the guiding function in low guiding magnetic field, virtual cathode 5 is after anode 6 net 4
The position of distance about 30mm is stably formed, and exports single-frequency microwave, and microwave frequency is 1.55GHz, and bundle ripple conversion efficiency is more than 20%.
High-Power Microwave radiate through antenna (microwave radiation window 7).
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, it should refer to
Go out, all any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, all should comprise
Within protection domain of the present utility model.
Claims (7)
1. the axial Virtual Cathode Oscillators in a band magnetic field, it is characterised in that: it include anode, negative electrode, insulator, anode network,
Low guiding magnetic field generation device and microwave radiation window, negative electrode is provided with cathode emission area, and negative electrode is arranged in anode and passes through
Insulator separates, and microwave radiation window is arranged on anode, is provided with anode network between negative electrode and microwave radiation window, and anode network is with micro-
Being provided with a microwave transmission chamber between wave radiating window, anode, negative electrode, insulator constitute vacuum chamber, vacuum chamber with microwave radiation window
Vacuum less than 10 millipascal.
The axial Virtual Cathode Oscillators in a kind of band magnetic field the most according to claim 1, it is characterised in that: described negative electrode sets
Putting in one end of anode, the other end of anode arranges microwave radiation window.
The axial Virtual Cathode Oscillators in a kind of band magnetic field the most according to claim 1 and 2, it is characterised in that: described is low
Magnetic field generation device is guided to be looped around anode outer to produce axially directed magnetic field.
The axial Virtual Cathode Oscillators in a kind of band magnetic field the most according to claim 3, it is characterised in that: described axially draws
The magnetic field intensity of magnetic conduction field is less than 0.5T.
The axial Virtual Cathode Oscillators in a kind of band magnetic field the most according to claim 1, it is characterised in that: described anode network
Electron beam transmitance is more than 90%.
The axial Virtual Cathode Oscillators in a kind of band magnetic field the most according to claim 5, it is characterised in that: described negative electrode is sent out
Penetrating the axial distance between district and anode network is 25mm～35mm.
The axial Virtual Cathode Oscillators in a kind of band magnetic field the most according to claim 6, it is characterised in that: described anode and
Voltage between negative electrode is 600kV, and electric current is 15kA, and guiding magnetic field intensity is 0.3T, between anode network and microwave radiation window
Microwave transmission intracavity and after being positioned at anode network the position of distance 26mm～36mm stably form virtual cathode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620687079.4U CN205881866U (en) | 2016-07-04 | 2016-07-04 | Take axial virtual cathode oscillator in magnetic field |
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105914119A (en) * | 2016-07-04 | 2016-08-31 | 中国工程物理研究院应用电子学研究所 | Axial virtual cathode oscillator with low guiding magnetic field |
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2016
- 2016-07-04 CN CN201620687079.4U patent/CN205881866U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105914119A (en) * | 2016-07-04 | 2016-08-31 | 中国工程物理研究院应用电子学研究所 | Axial virtual cathode oscillator with low guiding magnetic field |
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