CN204632716U - A kind of broadband relativistic klystron amplifier - Google Patents
A kind of broadband relativistic klystron amplifier Download PDFInfo
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- CN204632716U CN204632716U CN201520329547.6U CN201520329547U CN204632716U CN 204632716 U CN204632716 U CN 204632716U CN 201520329547 U CN201520329547 U CN 201520329547U CN 204632716 U CN204632716 U CN 204632716U
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Abstract
The utility model provides the technical scheme of a kind of broadband relativistic klystron amplifier, and the program includes the input cavity be arranged on drift tube, 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 output coaxial cable outer conductor.The program adopts Multiple level input cavity, two difference ginseng frequency tuning intermediate cavity and Multiple level output cavity, can improve the bandwidth of relativistic klystron amplifier to 10%.
Description
Technical field
The utility model relates to microwave electronics field, specifically a kind of broadband relativistic klystron amplifier.
Background technology
Relativistic klystron amplifier (RKA) is one of High-Power Microwave generation device of most potentiality, because RKA has the advantage of high power, high efficiency, output microwave phase and amplitude stabilization, the fields such as communication, radar, navigation, linear accelerator are widely used in.The klystron of high-peak power, narrowband operation is mainly applied in accelerator field.But in some warning radar systems, due to jamproof needs, require that klystron has certain bandwidth of operation, and the bandwidth of common RKA is not more than 5%, limit its range of application, the bandwidth therefore expanding relativistic klystron amplifier is one of emphasis in RKA research.
RKA bandwidth determines primarily of the bandwidth (bandwidth of clustering section) of the bandwidth sum fundamental modulation electric current of deferent segment, and the bandwidth of broadening clustering section and deferent segment is the key realizing broad-band klystron amplifier.At present, in traditional relativistic klystron amplifier, general employing single gap input cavity, perceptual intermediate cavity (frequency of intermediate cavity is perception higher than operating frequency and intermediate cavity) and single gap output cavity structure, therefore the factor affecting relativistic klystron amplifier bandwidth mainly contains three: 1. input cavity Q value is high and characteristic impedance is low, makes the line bandwidth of electron beam after input cavity not high.2. buncher number is few and make buncher cold chamber frequency generally cause the line narrow bandwidth of RKA clustering section higher than operating frequency (cavity in perception) to increase modulated current intensity.3. output cavity Q value is comparatively large and characteristic impedance is low, and the electric field strength that electron beam is got up in the excitation of output cavity gap is higher, causes portions of electronics backflow and rf arcing to cause the deferent segment bandwidth of RKA low.
In traditional RKA input cavity, in order to the angle uniformity and signal power coupling that ensure electric field in input cavity inject input cavity, normal employing works in the single gap reentry input cavity of pattern, causes that input cavity Q value is higher and characteristic impedance is lower, reduces the bandwidth of operation of input cavity.In order to reduce input cavity Q value and improve its characteristic impedance, need to improve input cavity structure when not causing input cavity electric field angle uniformity to be deteriorated.
Tradition RKA often adopts one or two intermediate cavity, and in order to obtain higher modulated current intensity, the resonance frequency of usual intermediate cavity is all perceptual higher than operating frequency, causes the narrow bandwidth of line after intermediate cavity modulation.In order to increase the modulation line bandwidth after RKA clustering section, need number and frequency that intermediate cavity is rationally set.
In traditional RKA, in order to ensure that output microwave power is high, frequency spectrum is single, normal employing single gap reentry nose cone output cavity, cause output cavity characteristic impedance low higher with Q value, the electric field strength that electron beam is got up in the excitation of output cavity gap is higher, cause portions of electronics to reflux and rf arcing, have impact on the bandwidth that RKA exports microwave.In order to improve the bandwidth of RKA deferent segment, need improve output cavity characteristic impedance and fall low reactance-resistance ratio.
Utility model content
The purpose of this utility model, be exactly for the deficiency existing for prior art, and the technical scheme of a kind of broadband relativistic klystron amplifier is provided, the program adopts Multiple level input cavity, two difference ginseng frequency tuning intermediate cavity and Multiple level output cavity, improves the bandwidth of relativistic klystron amplifier to 10%.
This programme is achieved by the following technical measures: a kind of broadband relativistic klystron amplifier, includes the input cavity be arranged on drift tube, 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 output coaxial cable outer conductor; Input cavity is arranged on the one end near negative electrode on drift tube; Input cavity inside is provided with two input cavity spacer rings; The feedthrough system of input cavity is provided with input coaxial outer conductor and input coaxial inner conductor; First intermediate cavity is arranged on the drift tube of close input cavity between input cavity and output cavity; Second intermediate cavity is arranged on the drift tube of close output cavity between input cavity and output cavity; Output cavity is arranged on the one end away from negative electrode on drift tube; The first output changeover portion is provided with after output cavity; Support bar rear is provided with the second output changeover portion; First exports changeover portion is connected with load by output coaxial cable outer conductor; Second exports changeover portion is connected with load by output coaxial cable inner wire; It is inner that collector and output coaxial cable inner wire are fixed on output coaxial cable outer conductor by support bar.
Preferred as this programme: be provided with output cavity spacer ring in output cavity.
Preferred as this programme: the frequency of the first intermediate cavity is lower than centre frequency and than the lower frequency limit height at least 100MH of 10% bandwidth; First intermediate cavity can be modulated the low-band signal in design bandwidth.
Preferred as this programme: the frequency of the second intermediate cavity is higher than centre frequency and than at least 100MH at the bottom of the upper limiting frequency of 10% bandwidth; Second intermediate cavity can be modulated the signal of the central segment in design bandwidth and high band.
Preferred as this programme: be provided with input cavity spacer ring in input cavity.
Preferred as this programme: the first intermediate cavity and the second intermediate cavity are provided with nose cone.
The beneficial effect of this programme can be learnt according to describing of such scheme, the Q value that feedthrough system due to input cavity in this scenario adopts input coaxial line inner and outer conductor effectively can reduce input cavity, improve electric field in input cavity angle uniformity and input cavity is provided with two input cavity spacer rings, add the number of gaps of input cavity, improve the characteristic impedance of input cavity and input cavity frequency characteristic can be made to become more smooth by pattern overlap.The bandwidth of coaxial line feedthrough system, low reactance-resistance ratio height characteristic impedance three gap overlapping die cavity energy broadening relativistic klystron amplifier input cavity.
The frequency of the first intermediate cavity is lower than centre frequency and than the lower frequency limit height at least 100MH of 10% bandwidth; First intermediate cavity can be modulated the low-band signal in design bandwidth.The frequency of the second intermediate cavity is higher than centre frequency and than at least 100MH at the bottom of the upper limiting frequency of 10% bandwidth; Second intermediate cavity can be modulated the signal of the central segment in design bandwidth and high band.Two difference ginseng frequency tuning intermediate cavity can expand the line bandwidth of relativistic klystron amplifier clustering section.
Be provided with output cavity spacer ring in output cavity, make output cavity become double gap structure, compared to single gap output cavity, there is higher characteristic impedance, lower gap voltage, electronic reflux and rf arcing can be alleviated, be conducive to the deferent segment bandwidth improving RKA.Adopt mould and mould frequency-portions overlap to make the Q value of Double-gap output cavity very low in addition, the bandwidth that RKA deferent segment obtains flat frequency characteristic in frequency band, high characteristic impedance, overlapping mould Double-gap output cavity have expanded RKA deferent segment can be made.
As can be seen here, the utility model compared with prior art, has substantive distinguishing features and progress, and its beneficial effect implemented also is apparent.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure, 1 is drift tube, and 2 is high-frequency signal, 3 is input cavity, and 5 is the first intermediate cavity, and 7 is the second intermediate cavity, 9 is output cavity, 10 is collector, and 11 is support bar, and 12 is output coaxial cable outer conductor, 13 is output coaxial cable inner wire, 14 is load, and 15 is negative electrode, and 16 is input coaxial outer conductor, 17 is input coaxial inner conductor, 18 is input cavity spacer ring, and 20 is electron beam, and 21 is nose cone, 23 is output cavity spacer ring, 24 is the first output changeover portion, and 25 is output cavity nose cone, and 26 is the second output changeover portion.
Embodiment
For the technical characterstic of this programme can be clearly demonstrated, below by an embodiment, and in conjunction with its accompanying drawing, this programme is set forth.
Can be found out by accompanying drawing, the operation principle of this programme is: microwave seed source export high-frequency signal feed-in three gap input cavity in and on cavity gap, set up high-frequency electric field.When the DC electronic bundle of cathode emission passes input cavity gap under the constraint of axial magnetic field, under the high-frequency electric field effect of input cavity gap, the speed of electronics is modulated, and obtains clustering in the electron beam that speed is modulated and then the drift tube after input cavity.High frequency induction current will be produced on the gap of the first intermediate cavity and the second intermediate cavity when the gap of clustering electron beam through the first intermediate cavity and the second intermediate cavity and encourage the first intermediate cavity and the second intermediate cavity resonance, first intermediate cavity and the second intermediate cavity gap set up high-frequency electric field, this high-frequency electric field carries out velocity modulation again to the electron beam of clustering conversely, obtains height clustering subsequently in the drift tube of electron beam after the second intermediate cavity.When the electron beam of height clustering passes Double-gap output cavity gap under the constraint of axial magnetic field, radio-frequency field has been encouraged in output cavity, the energy of radio-frequency field from the load being transferred to output coaxial cable inner and outer conductor and rear end between support bar, thus is transformed into microwave energy the portion of energy of electron beam.Electron beam, bombarding on collector through behind output cavity gap, is converted into heat energy dump energy.
Embodiment of the present utility model is:
Select a S-band broadband RKA, wherein, drift tube radius is 2.6cm, and input coaxial line inner and outer conductor radius is respectively 3.4cm, 3.6cm, and input cavity radius is 4.9cm, and gap is 0.8cm, and input cavity spacer ring internal diameter and thickness are respectively 2.6cm and 0.4cm; The pipe range that drifts about after input cavity is 26cm; The radius of the first intermediate cavity is 4.1cm, and chamber is long is 2.85cm, and in nose cone, outer radius is respectively 2.6cm and 3.0cm, and length is 1.05cm; Drift pipe range after first intermediate cavity is 20cm; The radius of the second intermediate cavity is 4.8cm, and chamber is long is 6.6cm, and in nose cone, outer radius is respectively 2.6cm and 3.0cm, and length is 4.9cm; The pipe range that drifts about after second intermediate cavity is 17cm; Output cavity radius is 4.9cm, gap is 0.9cm, 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, length is 5cm, and the first output changeover portion inside radius and length are respectively 3.4cm and 5cm, and support thickness is 0.4cm, second output changeover portion radius and length are respectively 1.8cm and 7.8cm, and output coaxial cable inner and outer conductor radius is respectively 1.8cm, 4.9cm.Bundle pressure 800kV, line 7kA, injecting high-frequency signal frequency by the high-frequency signal changing injecting tens kW, to obtain clustering length of tape when the fundamental current degree of depth of line after input cavity and the modulation of two intermediate cavity ratio of direct current bundle (the fundamental current amplitude with) is greater than 0.8 wide be 11%.With the modulator beam excitation output cavity that the fundamental current degree of depth is 0.8, the bandwidth obtaining output cavity is 15%.When homogeneous tube RKA runs, it exports microwave three dB bandwidth is 10%, exports microwave power and be greater than 1GW in bandwidth.Under similarity condition, traditional RKA exports microwave three dB bandwidth and is about 5%.Visible employing Multiple level input cavity, Multiple level output cavity and the tuning intermediate cavity of staggered can improve the bandwidth of RKA.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. a broadband relativistic klystron amplifier, is characterized in that: include the input cavity be arranged on drift tube, 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 output coaxial cable outer conductor; Described input cavity is arranged on the one end near negative electrode on drift tube; Described input cavity inside is provided with two input cavity spacer rings; The feedthrough system of described input cavity is provided with input coaxial outer conductor and input coaxial inner conductor; Described first intermediate cavity is arranged on the drift tube of close input cavity between input cavity and output cavity; Described second intermediate cavity is arranged on the drift tube of close output cavity between input cavity and output cavity; Described output cavity is arranged on the one end away from negative electrode on drift tube; Described output cavity rear is provided with the first output changeover portion; Described support bar rear is provided with the second output changeover portion; Described first exports changeover portion is connected with load by output coaxial cable outer conductor; Described second exports changeover portion is connected with load by output coaxial cable inner wire; It is inner that collector and output coaxial cable inner wire are fixed on output coaxial cable outer conductor by described support bar.
2. a kind of broadband according to claim 1 relativistic klystron amplifier, is characterized in that: be provided with input cavity spacer ring in described input cavity.
3. a kind of broadband according to claim 1 relativistic klystron amplifier, is characterized in that: the frequency of described first intermediate cavity is lower than centre frequency and than the lower frequency limit height at least 100MH of 10% bandwidth; Described first intermediate cavity can be modulated the low-band signal in design bandwidth.
4. a kind of broadband according to claim 1 relativistic klystron amplifier, is characterized in that: the frequency of described second intermediate cavity is higher than centre frequency and than at least 100MH at the bottom of the upper limiting frequency of 10% bandwidth; Described second intermediate cavity can be modulated the signal of the central segment in design bandwidth and high band.
5. a kind of broadband according to claim 1 relativistic klystron amplifier, is characterized in that: be provided with output cavity spacer ring in described output cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520329547.6U CN204632716U (en) | 2015-05-21 | 2015-05-21 | A kind of broadband relativistic klystron amplifier |
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| CN201520329547.6U CN204632716U (en) | 2015-05-21 | 2015-05-21 | A kind of broadband relativistic klystron amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104835707A (en) * | 2015-05-21 | 2015-08-12 | 中国工程物理研究院应用电子学研究所 | Broadband relativistic klystron amplifier |
| 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 |
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2015
- 2015-05-21 CN CN201520329547.6U patent/CN204632716U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104835707A (en) * | 2015-05-21 | 2015-08-12 | 中国工程物理研究院应用电子学研究所 | Broadband relativistic klystron amplifier |
| CN104835707B (en) * | 2015-05-21 | 2017-03-15 | 中国工程物理研究院应用电子学研究所 | A kind of broadband relativistic klystron amplifier |
| 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 |
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