CN104835707B - A kind of broadband relativistic klystron amplifier - Google Patents
A kind of broadband relativistic klystron amplifier Download PDFInfo
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- CN104835707B CN104835707B CN201510260497.5A CN201510260497A CN104835707B CN 104835707 B CN104835707 B CN 104835707B CN 201510260497 A CN201510260497 A CN 201510260497A CN 104835707 B CN104835707 B CN 104835707B
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Abstract
The invention provides a kind of technical scheme of broadband relativistic klystron amplifier, the program includes input cavity, output cavity, the first intermediate cavity, the second intermediate cavity, the first output changeover portion, the second output changeover portion, collector, support bar, output coaxial cable inner wire and the output coaxial cable outer conductor being arranged on drift tube.The program is using Multiple level input cavity, two difference ginseng frequency tuning intermediate cavities and Multiple level output cavity, it is possible to increase the bandwidth of relativistic klystron amplifier to 10%.
Description
Technical field
The present invention relates to microwave electronics field, specifically a kind of broadband relativistic klystron amplifier.
Background technology
Relativistic klystron amplifier（RKA）It is that most potential High-Power Microwave produces one of device, as RKA has
The advantage of high power, high efficiency, output microwave phase and amplitude stabilization, has been widely used for communication, radar, navigation, straight line
The fields such as accelerator.The klystron of high-peak power, narrowband operation is mainly applied in accelerator field.But in some early warning radars
In system, due to jamproof needs, it is desirable to which klystron has certain bandwidth of operation, and the bandwidth of common RKA is not more than 5%,
Its range of application is limited, the bandwidth for therefore expanding relativistic klystron amplifier is one of emphasis in RKA researchs.
RKA bandwidth is mainly by the bandwidth and the bandwidth of fundamental modulation electric current of deferent segment（The bandwidth of clustering section）Determine, broadening
The bandwidth of clustering section and deferent segment is to realize the key of broad-band klystron amplifier.At present, put in traditional relativistic klystron
In big device, typically using single gap input cavity, perceptual intermediate cavity（The frequency of intermediate cavity is intermediate cavity in sense higher than operating frequency
Property）Cavity configuration is exported with single gap, therefore affects the factor of relativistic klystron amplifier bandwidth mainly there are three：1. input cavity
Q-value is high and characteristic impedance is low so that line bandwidth of the electron beam after input cavity be not high.2. buncher number is few and in order to increase
Plus modulation current intensity makes the cold chamber frequency of buncher be generally greater than operating frequency（Cavity is in perception）Cause the line of RKA clustering sections
Narrow bandwidth.3. output cavity Q-value is larger and characteristic impedance is low so that the electric field intensity that electron beam gets up in output cavity gap excitation compared with
Height, causes part electronic reflux and rf arcing to cause the deferent segment bandwidth of RKA low.
In traditional RKA input cavities, in order to ensure the angular uniformity of electric field and signal power coupling injection in input cavity
Input cavity, frequently with the single gap reentry input cavity of the pattern that works in, causes that input cavity Q-value is higher and characteristic impedance is relatively low, drop
The low bandwidth of operation of input cavity.In order to reduce input cavity Q-value and improve its characteristic impedance, need do not causing input cavity electric field
Angular uniformity improves input cavity configuration in the case of being deteriorated.
Traditional RKA is frequently with one or two intermediate cavity, in order to obtain higher modulation current intensity, usual intermediate cavity
Resonant frequency is all higher than operating frequency and is in perception, causes narrow bandwidth of the line after intermediate cavity modulation.In order to increase RKA group
Modulation line bandwidth after poly- section, needs the number and frequency for rationally arranging intermediate cavity.
In traditional RKA, single in order to ensure output microwave power height, frequency spectrum, export frequently with single gap reentry nose cone
Chamber, causes that output cavity characteristic impedance is low and Q-value is higher so that the electric field intensity that electron beam gets up in output cavity gap excitation compared with
Height, causes part electronic reflux and rf arcing, have impact on the bandwidth that RKA exports microwave.In order to improve the band of RKA deferent segments
Width, needs to improve output cavity characteristic impedance and reduces Q-value.
Content of the invention
The purpose of the present invention, the deficiency being aiming at existing for prior art, and a kind of broadband relativistic klystron is provided
The technical scheme of amplifier, the program join frequency tuning intermediate cavities and Multiple level output cavity using Multiple level input cavity, two differences,
The bandwidth of relativistic klystron amplifier is improved to 10%.
This programme is achieved by the following technical measures：A kind of broadband relativistic klystron amplifier, includes and sets
Put input cavity on drift tube, output cavity, the first intermediate cavity, the second intermediate cavity, the first output changeover portion, the second output transition
Section, collector, support bar, output coaxial cable inner wire and output coaxial cable outer conductor；Input cavity is arranged on close on drift tube
One end of negative electrode；Input cavity is internally provided with two input cavity spacer rings；The feedthrough system of input cavity is provided with outside input coaxial line
Conductor and input coaxial inner conductor；First intermediate cavity is arranged between input cavity and output cavity the drift tube near input cavity
On；Second intermediate cavity is arranged between input cavity and output cavity on the drift tube of output cavity；Output cavity is arranged on drift tube
On away from negative electrode one end；The first output changeover portion is provided with after output cavity；Support bar rear is provided with the second output changeover portion；
First output changeover portion is connected with load by output coaxial cable outer conductor；Second output changeover portion is by leading in output coaxial cable
Body is connected with load；Support bar is fixed on collector and output coaxial cable inner wire inside output coaxial cable outer conductor.
As the preferred of this programme：Output intracavity is provided with output cavity spacer ring.
As the preferred of this programme：The frequency of the first intermediate cavity is less than mid frequency and higher than the lower frequency limit of 10% bandwidth
At least 100MH；First intermediate cavity can be modulated to the low-band signal in design bandwidth.
As the preferred of this programme：The frequency of the second intermediate cavity is higher than mid frequency and the upper limiting frequency bottom than 10% bandwidth
At least 100MH；Second intermediate cavity can be modulated to the signal of the central segment in design bandwidth and high band.
As the preferred of this programme：Input intracavity is provided with input cavity spacer ring.
As the preferred of this programme：Nose cone is provided with first intermediate cavity and the second intermediate cavity.
The beneficial effect of this programme can be according to learning to the narration of such scheme, due to the feed-in of input cavity in this scenario
System effectively can be reduced using input coaxial line inner and outer conductor input cavity Q-value, improve electric field in input cavity angular
Even property and input cavity is provided with two input cavity spacer rings, increased the number of gaps of input cavity, improves the characteristic of input cavity
Impedance and can by pattern overlap make input cavity frequency characteristic become more flat.The high characteristic of coaxial line feedthrough system, low reactance-resistance ratio
Three gap of impedance overlaps the bandwidth of die cavity energy broadening relativistic klystron amplifier input cavity.
The frequency of the first intermediate cavity is less than mid frequency and at least 100MH higher than the lower frequency limit of 10% bandwidth；In the middle of first
Chamber can be modulated to the low-band signal in design bandwidth.The frequency of the second intermediate cavity is higher than mid frequency and 10% bandwidth of ratio
Upper limiting frequency bottom at least 100MH；Second intermediate cavity can be adjusted to the signal of the central segment in design bandwidth and high band
System.Two difference ginseng frequency tuning intermediate cavities can expand the line bandwidth of relativistic klystron amplifier clustering section.
Output intracavity is provided with output cavity spacer ring, makes output cavity become double gap structure, has compared to single gap output cavity
There are higher characteristic impedance, lower gap voltage, electronic reflux and rf arcing can be mitigated, be conducive to improving the defeated of RKA
Go out a section bandwidth.In addition being overlapped using mould and mould frequency-portions causes the Q-value of Double-gap output cavity very low, can make RKA deferent segments
Obtain, in frequency band, the band that flat frequency characteristic, high characteristic impedance, overlap mould Double-gap output cavity have expanded RKA deferent segments
Wide.
As can be seen here, the present invention compared with prior art, with substantive distinguishing features and progress, its beneficial effect that implements
It is obvious.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
In figure, 1 is drift tube, and 2 is high-frequency signal, and 3 is input cavity, and 5 is the first intermediate cavity, and 7 is the second intermediate cavity, and 9 are
Output cavity, 10 is collector, and 11 is support bar, and 12 is output coaxial cable outer conductor, and 13 is output coaxial cable inner wire, and 14 is negative
Carry, 15 is negative electrode, and 16 are input coaxial outer conductor, and 17 are input coaxial inner conductor, and 18 is input cavity spacer ring, and 20 is electronics
Beam, 21 is nose cone, and 23 is output cavity spacer ring, and 24 is the first output changeover portion, and 25 is output cavity nose cone, and 26 is the second output transition
Section.
Specific embodiment
For the technical characterstic of this programme clearly can be described, below by a specific embodiment, and its accompanying drawing is combined, right
This programme is illustrated.
By accompanying drawing as can be seen that the operation principle of this programme is：Between the high-frequency signal feed-in three of microwave seed source output
High-frequency electric field is set up in gap input cavity and on cavity gap.The unidirectional current beamlet of emission of cathode is worn under the constraint of axial magnetic field
When crossing input cavity gap, under the high-frequency electric field effect of input cavity gap, the speed of electronics is modulated, the modulated electricity of speed
Beamlet further obtains clustering in the drift tube after input cavity.When clustering electron beam is through the first intermediate cavity and the second intermediate cavity
Will produce on the gap of the first intermediate cavity and the second intermediate cavity during gap high frequency induction current encouraged the first intermediate cavity and
Second intermediate cavity resonance, sets up high-frequency electric field in the first intermediate cavity and the second middle cavity gap, and the high-frequency electric field is right in turn
The electron beam of clustering carries out velocity modulation again, and subsequent electron beam obtains height group in the drift tube after the second intermediate cavity
Poly-.When the electron beam of height clustering passes through Double-gap output cavity gap under the constraint of axial magnetic field, swash in output cavity
Excited high frequency field, the energy of high frequency field from the load for being transferred to output coaxial cable inner and outer conductor and rear end between support bar, so as to
The portion of energy of electron beam is transformed into microwave energy.Electron beam is being bombarded on collector through after output cavity gap, surplus
Complementary energy is converted into heat energy.
Embodiments of the invention are：
A S-band broadband RKA is selected, wherein, drift tube radius is 2.6cm, is input into coaxial line inner and outer conductor radius point
Not Wei 3.4cm, 3.6cm, input cavity radius be 4.9cm, gap is 0.8cm, and input cavity spacer ring internal diameter and thickness are respectively 2.6cm
And 0.4cm；The a length of 26cm of drift tube after input cavity；The radius of the first intermediate cavity is 4.1cm, and a length of 2.85cm in chamber, inside and outside nose cone
Radius is respectively 2.6cm and 3.0cm, and length is 1.05cm；The a length of 20cm of drift tube after first intermediate cavity；Second intermediate cavity
Radius is 4.8cm, a length of 6.6cm in chamber, and in nose cone, outer radius is respectively 2.6cm and 3.0cm, and length is 4.9cm；Second intermediate cavity
The a length of 17cm of drift tube afterwards；Output cavity radius is 4.9cm, and gap is 0.9cm, and output cavity spacer ring internal diameter and thickness are respectively
2.7cm and 0.3cm, in output cavity nose cone, outer radius is respectively 2.6cm and 3.0cm, and length is 5cm, in the first output changeover portion
Radius and length are respectively 3.4cm and 5cm, and support thickness is 0.4cm, and the second output changeover portion radius and length are respectively
1.8cm and 7.8cm, output coaxial cable inner and outer conductor radius are respectively 1.8cm, 4.9cm.Beam pressure 800kV, line 7kA, passes through
Inject the high-frequency signal of tens kW and change after injection high-frequency signal frequency obtains line through input cavity and the modulation of two intermediate cavities
Fundamental current depth（The ratio of fundamental current amplitude and direct current beam）Clustering section during more than 0.8 is with a width of 11%.Use fundamental current
Depth is 0.8 modulator beam excitation output cavity, obtains the band a width of 15% of output cavity.When homogeneous tube RKA runs, which exports microwave 3dB
With a width of 10%, in bandwidth, output microwave power is more than 1GW.Under similarity condition, traditional RKA outputs microwave three dB bandwidth is about
5%.It can be seen that employing Multiple level input cavity, Multiple level output cavity and staggered tuning intermediate cavity can improve the bandwidth of RKA.
Presently preferred embodiments of the present invention is the foregoing is only, not in order to limit the present invention, all in essence of the invention
Any modification, equivalent and improvement that is made within god and principle etc., should be included within the scope of the present invention.
Claims (2)
1. a kind of broadband relativistic klystron amplifier, is characterized in that：Include input cavity, the output being arranged on drift tube
Chamber, the first intermediate cavity, the second intermediate cavity, the first output changeover portion, the second output changeover portion, collector, support bar, output are coaxial
Line inner wire and output coaxial cable outer conductor；The input cavity is arranged on drift tube the one end near negative electrode；The input cavity
It is internally provided with two input cavity spacer rings；The feedthrough system of the input cavity is provided with input coaxial outer conductor and input is coaxial
Line inner wire；First intermediate cavity is arranged between input cavity and output cavity on the drift tube of input cavity；Described second
Intermediate cavity is arranged between input cavity and output cavity on the drift tube of output cavity；The output cavity is arranged on drift tube far
One end from negative electrode；The output cavity rear is provided with the first output changeover portion；The support bar rear is provided with the second output
Changeover portion；The first output changeover portion is connected with load by output coaxial cable outer conductor；The second output changeover portion leads to
Cross output coaxial cable inner wire to be connected with load；It is same that collector and output coaxial cable inner wire are fixed on output by the support bar
Inside axis outer conductor；The frequency of first intermediate cavity is less than mid frequency and higher than the lower frequency limit of 10% bandwidth at least
100MHz；First intermediate cavity can be modulated to the low-band signal in design bandwidth；The frequency of second intermediate cavity
It is higher than mid frequency and at least 100MHz lower than the upper limiting frequency of 10% bandwidth；Second intermediate cavity can be in design bandwidth
Central segment and the signal of high band be modulated.
2. a kind of broadband relativistic klystron amplifier according to claim 1, is characterized in that：The output intracavity is arranged
There is output cavity spacer ring.
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| CN201510260497.5A CN104835707B (en) | 2015-05-21 | 2015-05-21 | A kind of broadband relativistic klystron amplifier |
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| CN201510260497.5A CN104835707B (en) | 2015-05-21 | 2015-05-21 | A kind of broadband relativistic klystron amplifier |
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| CN104835707A CN104835707A (en) | 2015-08-12 |
| CN104835707B true CN104835707B (en) | 2017-03-15 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104900465A (en) * | 2015-06-23 | 2015-09-09 | 中国工程物理研究院应用电子学研究所 | Dual-wave-band relativistic klystron amplifier |
| CN106206219B (en) * | 2016-08-31 | 2018-07-20 | 中国工程物理研究院应用电子学研究所 | A kind of tunable klystron amplifier output cavity |
| CN107968030B (en) * | 2017-12-29 | 2019-04-23 | 中国工程物理研究院应用电子学研究所 | It is coaxially injected greater than mould than coaxial relativistic klystron amplifier in one kind |
| CN110718426B (en) * | 2019-09-27 | 2021-10-26 | 中国工程物理研究院应用电子学研究所 | High-frequency high-power microwave device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949011A (en) * | 1989-03-30 | 1990-08-14 | Varian Associates, Inc. | Klystron with reduced length |
| CN103681177A (en) * | 2013-09-29 | 2014-03-26 | 中国科学院电子学研究所 | S-waveband 12.1% bandwidth klystron |
| CN204632716U (en) * | 2015-05-21 | 2015-09-09 | 中国工程物理研究院应用电子学研究所 | A kind of broadband relativistic klystron amplifier |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5840742A (en) * | 1981-09-02 | 1983-03-09 | Nec Corp | Multi-cavity klystron |
| US6326730B1 (en) * | 1998-11-16 | 2001-12-04 | Litton Systems, Inc, | Low-power wide-bandwidth klystron |
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2015
- 2015-05-21 CN CN201510260497.5A patent/CN104835707B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949011A (en) * | 1989-03-30 | 1990-08-14 | Varian Associates, Inc. | Klystron with reduced length |
| CN103681177A (en) * | 2013-09-29 | 2014-03-26 | 中国科学院电子学研究所 | S-waveband 12.1% bandwidth klystron |
| CN204632716U (en) * | 2015-05-21 | 2015-09-09 | 中国工程物理研究院应用电子学研究所 | A kind of broadband relativistic klystron amplifier |
Non-Patent Citations (3)
| Title |
|---|
| S波段相对论速调管放大器双间隙输出腔的理论与实验研究;雷禄容;《中国优秀硕士学位论文全文数据库 信息科技辑》;20080615;正文第48页图5.6、第32页图4.1 * |
| X波段GW级四腔相对论速调管放大器的仿真分析与设计;刘振帮等;《中国电子学会真空电子学分会第十九届学术年会论文集（上册）》;20130822;第416页图1(a) * |
| 双间隙耦合输入腔的计算与仿真研究;黄传禄等;《真空科学与技术学报》;20120115;第32卷(第1期);第40页左栏第1-2段 * |
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