CN103996590A - Relativistic klystron amplifier output cavity internally installed with collector - Google Patents
Relativistic klystron amplifier output cavity internally installed with collector Download PDFInfo
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- CN103996590A CN103996590A CN201410166917.9A CN201410166917A CN103996590A CN 103996590 A CN103996590 A CN 103996590A CN 201410166917 A CN201410166917 A CN 201410166917A CN 103996590 A CN103996590 A CN 103996590A
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Abstract
The invention discloses a relativistic klystron amplifier (RKA) output cavity internally installed with a collector. The external diameter of an output cavity nose cone increases gradually from the input direction to the collector connection point. The inner diameter of the collector increases gradually from the output cavity nose cone connection point to the collector main body. The inner wall of an output cavity outer cylinder between supporting pillars and an output cavity end cover is provided with convex bench, and the three supporting pillars are uniformly distributed on the same circumference cross section in the output cavity outer cylinder. According to the relativistic klystron amplifier output cavity, the output cavity Q value is reduced under the condition of not reducing the angular uniformity of the electric field of the output cavity, thereby reducing the electric field intensity in the output cavity, reducing backflow electrons, reducing adverse impact of the backflow electrons on the working stability of a relativistic klystron amplifier, reducing power density of electron beams attacking the inner surface of the collector, reducing the generation of secondary electrons and other impurities, furthermore, preventing the secondary electrons and other impurities from escaping from the collector, and improving the RKA long pulse repeat frequency operation capability.
Description
Technical field
The present invention relates to microwave electronics field, be specifically related to a kind of relativistic klystron amplifier output cavity of built-in collector.
Background technology
Relativistic klystron amplifier (RKA) is that the High-Power Microwave of tool potentiality produces one of device, and it is microwave energy by the interaction of electron beam and radio-frequency field by the power conversion of electron beam.In RKA, the clustering of electron beam and Microwave Extraction process complete in zones of different, and every kind of function can independently be debugged the best, therefore has the advantages such as high-power high-efficiency.Wherein, the stability of raising relativistic klystron amplifier long pulse repetition operation is one of emphasis of research.
At present, in the cylinder output cavity of traditional built-in collector, be subject to output cavity structural limitations, electron beam can directly bombard to collector behind output cavity gap, its higher power density causes collector to produce secondary electron and other impurity, secondary electron and impurity can cause vibration, Efficiency Decreasing after escaping into output cavity gap, affect the stability of RKA long pulse repetition operation.
The factor that affects relativistic klystron amplifier long pulse repetition operation stability aspect output cavity mainly contains two: the one, and output cavity Q value is larger, the electric field strength that electron beam is encouraged in output cavity gap is higher, cause portions of electronics backflow (will avoid electronic reflux in klystron amplifier), backflow electrons affects the normal work in front other chambeies of output cavity, reduces the stability of microwave output; The 2nd, be subject to output cavity structural limitations, electron beam can directly bombard to collector behind output cavity gap, its higher power density causes collector to produce secondary electron and other impurity, secondary electron and impurity can cause vibration, Efficiency Decreasing after escaping into output cavity gap, affect the stability of relativistic klystron amplifier long pulse repetition operation.
Summary of the invention
The object of the invention is, by improving relativistic klystron amplifier output cavity and collecting pole structure, to improve the stability of the long pulse repetition operation of relativistic klystron amplifier;
Further to reduce output cavity Q value, the impact that the duplet RKA long pulse repetition that reduces to reflux moves;
The impact of the secondary electron that further reduction beam bombardment collector produces on RKA long pulse repetition operation.
For achieving the above object, the technical solution used in the present invention: a kind of relativistic klystron amplifier output cavity of built-in collector, comprises drift tube, output cavity end cap, output cavity urceolus, output cavity nose cone, support bar and collector; Described drift tube is connected with output cavity end cap, and output cavity urceolus left end is connected with output cavity end cap, and described output cavity nose cone is connected with collector and is fixed in output cavity urceolus by support bar; Described output cavity nose cone becomes greatly towards collector junction external diameter gradually from input direction, and described collector is from becoming gradually large with output cavity nose cone junction towards collector main direction internal diameter.
In technique scheme, for described output cavity outer tube inner wall is provided with the boss of circumference symmetry.
In technique scheme, described boss is arranged on the output cavity outer tube inner wall between support bar and output cavity end cap.
In technique scheme, between described collector and output cavity urceolus, be provided with three support bars.
In technique scheme, described three support bars are uniformly distributed on same circumferential section in output cavity urceolus.
In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows:
The one, add a boss structure and reduced after support bar number at output cavity urceolus, can reduce output cavity Q value not reducing in the inhomogeneity situation of output cavity internal electric field angle, thereby the electric field strength in reduction output cavity, reduce backflow electronics, reduce the adverse effect of backflow duplet relativistic klystron amplifier job stability;
The 2nd, after collector is expanded, can reduce the power density of beam bombardment collector inner surface, reduce the generation of secondary electron and other impurity;
The 3rd, the collector entrance of toroidal can further prevent secondary electron and other impurity effusion collectors, thereby improves the ability of RKA long pulse repetition operation.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the structure cutaway view of the output cavity of traditional built-in collector;
Fig. 2 is the A-A view of Fig. 1;
Fig. 3 is the structure cutaway view of built-in collector output cavity of the present invention;
Fig. 4 is the A-A view of Fig. 2;
Wherein: the 1st, drift tube, the 2nd, output cavity end cap, the 3rd, output cavity urceolus, the 4th, output cavity nose cone, the 5th, support bar, the 6th, collector, the 7th, electron beam.
Embodiment
Disclosed all features in this specification, or step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
As shown in Fig. 1 and Fig. 2, traditional relativistic klystron amplifier output cavity comprises drift tube 1, output cavity end cap 2, output cavity urceolus 3, output cavity nose cone 4, support bar 5 and collector 6; The clustering section of the external relativistic klystron amplifier in one end of drift tube 1, the other end is connected with output cavity end cap 2, and the other end of output cavity end cap 2 connects output cavity urceolus 3, and the other end of output cavity urceolus 3 connects load; Output cavity nose cone 4 is connected with collector 6 and is fixed in output cavity urceolus 3 by support bar 5, support bar 5 is made up of along the circumferential direction equally distributed multiple support, support inside radius identical with collector 6 outer radius, support bar 5 is inner to be connected with collector 6, and outer end is connected with output cavity urceolus 3.
The operation principle of relativistic klystron amplifier output cavity is: the annular electron beam 7 of clustering enters from drift tube 1, under the effect of externally-applied magnetic field, move vertically, in the time that electron beam enters the gap between output cavity end cap 2 and output cavity nose cone 4, (refer to output cavity end cap 2 at output cavity, output cavity urceolus 3, output cavity nose cone 4, region between support bar 5) the middle radio-frequency field that encouraged, the coaxial line that the energy of radio-frequency field forms from being transferred to output cavity urceolus 3 and collector 6 between multiple supports of support bar 5, and then output to the load of rear end, thereby complete Microwave Extraction process.Electron beam is mobile in continuation after output cavity gap (region output cavity end cap 2 and support bar 5), because externally-applied magnetic field reduces rapidly in collector region, under the effect of space-charge force, electron beam starts diffusion, annular electron beam outward flange electronics is fast compared with inward flange electrons spread, electron beam cross section connects expansion, and with lower-wattage density bombardment collector 6 inner surfaces, the remaining Conversion of Energy of electron beam is heat energy.
The present invention is directed to existing relativistic klystron amplifier output cavity and carry out structural improvement to reach corresponding object, be specifically implemented as follows.
Measure one: in order to reduce output cavity Q value, the impact of the duplet RKA long pulse repetition operation that reduces to reflux need to reduce the number of support bar in the situation that not causing output cavity electric field angle uniformity variation.
On the output cavity urceolus 3 between output cavity end cap 2 and support bar 5, be provided with boss, as shown in Figure 3, reduce the quantity of support bar 5 simultaneously, make as shown in Figure 2 traditional six roots of sensation support bar 5 into three support bars 5 of the present invention as shown in Figure 4, support bar 5 is uniformly distributed on the same plane of the cross section of output cavity urceolus 3.
Support bar 5 decreased number, can effectively reduce the Q value of output cavity; The boss adding is that angle is uniform, as a pip of output cavity radio-frequency field, can the in the situation that of support bar decreased number, ensure output cavity in the angle uniformity of electric field.Lower Q value can reduce the electric field strength in output cavity, reduces backflow electronics, improves the job stability of relativistic klystron amplifier.
Measure two: the impact repetition of RKA long pulse being moved in order to reduce the secondary electron of beam bombardment collector generation, need to reduce on the one hand the generation of secondary electron and other impurity, need on the other hand to prevent secondary electron and other impurity effusion collectors and enter into output cavity gap.
As shown in Figure 3, traditional collector 6 entrances are modified as to toroidal, the outer radius of output cavity nose cone 4 is designed to gradual change shape simultaneously, from input direction to collector direction, the external diameter of output cavity nose cone 4 is become to large gradually, simultaneously by collector 6 from becoming gradually greatly to outbound course internal diameter with output cavity nose cone 4 junctions, and increase the length of collector 6 main bodys.
Because externally-applied magnetic field intensity can reduce rapidly in collector region, after output cavity nose cone 4 outer radius and the interior outer radius expansion of collector 6, can make electron beam spread rapidly at collector place, reduce the power density of beam bombardment collector inner surface, thereby reduce the generation of secondary electron and other impurity; The collector entrance of toroidal can further prevent secondary electron and other impurity effusion collectors, improves the stability of RKA long pulse repetition operation.
Embodiment
As a special case of the present invention, consider a S-band RKA output cavity and collector.Wherein, outer radius is respectively 2.4cm, 2.8cm in drift tube, and in output cavity urceolus, outer radius is respectively 4.8cm, 5.2cm, and boss left end is apart from output cavity end cap 1.5cm, left side direct tube section inside radius 4.4cm, long 0.5cm, right side gradual change segment length 3.0cm; ; In support bar, outer radius is respectively 4.0cm, 4.8cm, apart from output cavity end cap 5.0cm, has 3 supports, the wide 0.5cm of each support; Nose cone overall length 3.5cm, apart from output cavity end cap 1.5cm, inside radius 2.4cm, left side direct tube section outer radius 3.0cm, long 0.5cm, right side outer radius is 4.0cm; Collector outer radius 4.0cm, left side transition inside radius becomes 3.8cm from 2.4cm, long 4.0cm, middle part straight tube segment length 6.0cm, right side transition radius becomes 1.6cm from 3.8cm, long 4.0cm.In experiment, electron beam enters output cavity from output cavity left end, at electron beam pulsewidth 200ns, interior outer radius is respectively 1.9 cm, 2.1cm, bundle is pressed 600kV, and line 5kA, in the situation of fundamental current 4kA, output microwave power 700MW, there is not exporting the phenomenon that microwave amplitude reduces and pulsewidth shortens in repetition 25Hz operation 1s.
Under similarity condition, the cylindrical output cavity power output 700MW of traditional built-in collector, in the time of repetition 10Hz operation 1s after 4 output pulses just occurred that microwave amplitude reduces and the phenomenon of pulsewidth shortening.Visible, expand collector size and change collector entrance into toroidal and can improve the stability of RKA long pulse repetition operation.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.
Claims (6)
1. a relativistic klystron amplifier output cavity for built-in collector, comprises drift tube, output cavity end cap, output cavity urceolus, output cavity nose cone, support bar and collector; Described drift tube is connected with output cavity end cap, and output cavity urceolus left end is connected with output cavity end cap, and described output cavity nose cone is connected with collector and is fixed in output cavity urceolus by support bar; It is characterized by described output cavity nose cone and become gradually greatly towards collector junction external diameter from input direction, described collector is from becoming gradually large with output cavity nose cone junction towards collector main direction internal diameter.
2. the relativistic klystron amplifier output cavity of a kind of built-in collector according to claim 1, is characterized by described output cavity outer tube inner wall and is provided with boss.
3. the relativistic klystron amplifier output cavity of a kind of built-in collector according to claim 2, is characterized by described boss and is arranged on the output cavity outer tube inner wall between support bar and output cavity end cap.
4. the relativistic klystron amplifier output cavity of a kind of built-in collector according to claim 3, it is characterized by described boss is that circumference is symmetrical arranged.
5. according to the relativistic klystron amplifier output cavity of a kind of built-in collector described in claim 1 or 2 or 3 or 4, it is characterized by and between described collector and output cavity urceolus, be provided with three support bars.
6. the relativistic klystron amplifier output cavity of a kind of built-in collector according to claim 5, is characterized by described three support bars and on same circumferential section, is uniformly distributed in output cavity urceolus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410166917.9A CN103996590A (en) | 2014-04-24 | 2014-04-24 | Relativistic klystron amplifier output cavity internally installed with collector |
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| CN201410166917.9A CN103996590A (en) | 2014-04-24 | 2014-04-24 | Relativistic klystron amplifier output cavity internally installed with collector |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104835706A (en) * | 2015-05-21 | 2015-08-12 | 中国工程物理研究院应用电子学研究所 | Relativistic klystron amplifier output cavity |
| CN104952676A (en) * | 2015-06-29 | 2015-09-30 | 中国工程物理研究院应用电子学研究所 | RKA (relativistic klystron amplifier) output cavity with inner conductor arranged inside |
| CN105261541A (en) * | 2015-11-10 | 2016-01-20 | 中国人民解放军国防科学技术大学 | High power radial line relativistic klystron amplifier |
| CN106206219A (en) * | 2016-08-31 | 2016-12-07 | 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 |
| CN107946156A (en) * | 2017-12-04 | 2018-04-20 | 中国人民解放军国防科技大学 | Electronic collector of coaxial transit time oscillator capable of working in long pulse state |
| CN111312571A (en) * | 2020-03-03 | 2020-06-19 | 中国科学院高能物理研究所 | TM (transverse magnetic)010Mould multi-injection klystron output cavity |
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| CN203839338U (en) * | 2014-04-24 | 2014-09-17 | 中国工程物理研究院应用电子学研究所 | Relativity klystron amplifier output cavity with built-in collector |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104835706A (en) * | 2015-05-21 | 2015-08-12 | 中国工程物理研究院应用电子学研究所 | Relativistic klystron amplifier output cavity |
| CN104952676A (en) * | 2015-06-29 | 2015-09-30 | 中国工程物理研究院应用电子学研究所 | RKA (relativistic klystron amplifier) output cavity with inner conductor arranged inside |
| CN105261541A (en) * | 2015-11-10 | 2016-01-20 | 中国人民解放军国防科学技术大学 | High power radial line relativistic klystron amplifier |
| CN106206219A (en) * | 2016-08-31 | 2016-12-07 | 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 |
| 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 |
| CN107946156A (en) * | 2017-12-04 | 2018-04-20 | 中国人民解放军国防科技大学 | Electronic collector of coaxial transit time oscillator capable of working in long pulse state |
| CN111312571A (en) * | 2020-03-03 | 2020-06-19 | 中国科学院高能物理研究所 | TM (transverse magnetic)010Mould multi-injection klystron output cavity |
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