CN104134596B - The absorbing cavity device of suppression gap coupled cavity 2 pi-mode oscillation and adjustment method thereof - Google Patents
The absorbing cavity device of suppression gap coupled cavity 2 pi-mode oscillation and adjustment method thereof Download PDFInfo
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- CN104134596B CN104134596B CN201410379750.4A CN201410379750A CN104134596B CN 104134596 B CN104134596 B CN 104134596B CN 201410379750 A CN201410379750 A CN 201410379750A CN 104134596 B CN104134596 B CN 104134596B
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Abstract
The invention provides and a kind of suppress the absorbing cavity device of 2 pi-mode oscillations in gap coupled cavity.The double tunning absorbing cavity of high-selenium corn chamber device resonance simultaneously is in TM110Pattern and TM210Pattern, and it is connected to gap coupled cavity by coupled waveguide, can effectively suppress the vibration in gap coupled cavity output circuit with two non-operating modes of 2 π mould field shape distributions, eliminate the unstability of the multiple-beam klystron caused by such vibration, reduce sundry spectrum level.
Description
Technical field
The present invention relates to electron trade electric vacuum technology field, particularly relate to a kind of suppression gap coupled cavity 2 pi-mode oscillation
Absorbing cavity device.
Background technology
In order to extend the bandwidth of multiple-beam klystron, generally use gap coupled cavity as Broadband emission circuit.Due to double
There is internal feedback between two resonator cavitys of gap coupled cavity output circuit, under certain condition, non-operating mode can be caused to shake
Swing, cause multiple-beam klystron beam current and Beam transmission to decline, cause multiple-beam klystron to strike sparks.Additionally, at high frequency
Under excitation, due to electronics note velocity variations or reversion electronics and the existence of secondary electron on a small quantity, excitation is played other inoperative mould
Formula, forms miscellaneous spectrum, reduces the quality of output spectrum, causes the sparking of transmitter output waveguide and disturbs other microwave electron system
System.Therefore, suppression multiple-beam klystron non-operating mode vibration to improve multiple-beam klystron performance, it is ensured that output spectrum weight and
Job stability so that it is normally work in microwave electron system, significant.
For the multiple-beam klystron that operating frequency is low-frequency range (L and S-band), generally use the double gap being operated in π mould
Coupled cavity output circuit.Researching and analysing and actual tubulation shows, it is the non-of 2 π mode structures that this output circuit easily produces field distribution
Mode of operation is vibrated.For the miscellaneous spectrum suppressing the vibration of such non-operating mode to produce, generally on gap coupled cavity external one
Individual absorbing cavity, this absorbing cavity is coupled with gap coupled cavity by coupling aperture, the field that suppression resonant frequency is more slightly higher than mode of operation
Shape is the TM of 2 π moulds010The vibration of pattern.And the work of actual tubulation shows, resonant frequency is higher, and field shape is the TM of 2 π moulds110Pattern
The most also can produce vibration, this vibration can have a strong impact on stablizing of multiple-beam klystron DC state work equally
Property.
Summary of the invention
(1) to solve the technical problem that
In view of above-mentioned technical problem, the invention provides a kind of absorbing cavity device suppressing gap coupled cavity 2 pi-mode oscillation
And adjustment method, to suppress the non-operating mode in gap coupled cavity.
(2) technical scheme
The present invention suppresses the absorbing cavity device of 2 pi-mode oscillations in gap coupled cavity to include: double tunning absorbing cavity, for hollow
Rectangular closed resonator cavity, its first end seal closes, and inside it, at least part of area of cavity wall has microwave attenuating material；Rectangle coupled wave
Lead, be connected between the second end and the described gap coupled cavity of described double tunning absorbing cavity, just to described gap coupled cavity
The coupling slot of side, the Mode Coupling between described double tunning absorbing cavity and gap coupled cavity.Wherein, described double tunning
Absorbing cavity two screws opened above, by these two screws, insert respectively in described double tunning absorbing cavity vertically downward
One tuning screw and second tune screw, wherein, these two screws are respectively positioned on the center of described double tunning absorbing cavity broadside, make this
Double tunning absorbing cavity resonance simultaneously is in TM110Pattern and TM210Pattern.
(3) beneficial effect
From technique scheme it can be seen that the present invention suppress 2 pi-mode oscillations in gap coupled cavity absorbing cavity device and
Its modulator approach has the advantages that
(1) double tunning absorbing cavity resonance simultaneously is in TM110Pattern and TM210Pattern, its by coupled waveguide be connected to double between
Gap coupled cavity such that it is able to there are in suppression gap coupled cavity output circuit two inoperatives of 2 π mould field shape distributions effectively
The vibration of pattern, eliminates the unstability of the multiple-beam klystron caused by such vibration, reduces sundry spectrum level simultaneously；
(2) can two non-operating modes with 2 π mould field shape distributions be loaded simultaneously, and to having the shape distribution of π mould field
The loading of mode of operation is the least, can guarantee that while suppression non-operating mode vibration, efficiency and the merit to multiple-beam klystron
Rate-frequency range characteristic impact is the least；
(3) attenuating material coats and is sintered in absorbing cavity inner surface, good heat dissipation, gives vent to anger little；
(4) volume is little, and preparation and assembly technology are simple.
Accompanying drawing explanation
Fig. 1 is the absorbing cavity device suppressing double-gap coupling cavity of multiple-beam klystron 2 pi-mode oscillation according to embodiments of the present invention
Longitudinal sectional view；
Fig. 2 A is the longitudinal sectional view after absorbing cavity device shown in Fig. 1 assembles with double-gap coupling cavity of multiple-beam klystron；
Fig. 2 B is the transverse sectional view after absorbing cavity device shown in Fig. 1 assembles with double-gap coupling cavity of multiple-beam klystron.
[main element of the present invention]
100-absorbing cavity device；
110-double tunning absorbing cavity；
111-cavity；112-chamber lid；
113-microwave attenuating material；114-the first tuning screw；
115-second tune screw；
120-rectangle coupled waveguide；
121-the first rectangular waveguide hole；122-the second rectangular waveguide hole；
200-double-gap coupling cavity of multiple-beam klystron；
210-cavity；
211-positioning step；
220-upper chamber cover；
230-cavity of resorption lid；
240-coupling iris；
241,242-coupling slot；243-coupling ring；
244-exports rectangular waveguide.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.It should be noted that in accompanying drawing or description describe, similar or identical portion
Divide and all use identical figure number.The implementation not illustrated in accompanying drawing or describe, for those of ordinary skill in art
Known form.Although it addition, can provide herein the demonstration of the parameter comprising particular value, it is to be understood that parameter is without definite etc.
In corresponding value, but can be similar to be worth accordingly in acceptable error margin or design constraint.Embodiment is mentioned
Direction term, such as " on ", D score, "front", "rear", "left", "right" etc., be only the direction with reference to accompanying drawing.Therefore, the side of use
It is used to illustrate not for limiting the scope of the invention to term.
The present invention suppresses the device of double-gap coupling cavity of multiple-beam klystron 2 pi-mode oscillation, it is possible to velocity modulation is noted in suppression more effectively
Pipe gap coupled cavity output circuit has the vibration of two non-operating modes of 2 π mould field shape distributions, eliminates and vibrated by such
The unstability of the multiple-beam klystron caused, reduces sundry spectrum level simultaneously.
In one exemplary embodiment of the present invention, it is provided that a kind of suppression double-gap coupling cavity of multiple-beam klystron 2 π mould
The generalized section of the absorbing cavity device of vibration.Fig. 1 is to suppress double-gap coupling cavity of multiple-beam klystron 2 according to the embodiment of the present invention
The generalized section of the device of pi-mode oscillation.
As it is shown in figure 1, the present embodiment absorbing cavity device 100 includes: double tunning absorbing cavity 110, for the rectangle resonance of hollow
Chamber；Rectangle coupled waveguide 120, is connected between double tunning absorbing cavity 110 and double-gap coupling cavity of multiple-beam klystron 200, the most right
The coupling slot of described double-gap coupling cavity of multiple-beam klystron 200 side, between double tunning absorbing cavity 110 and multiple-beam klystron are double
Mode Coupling between gap coupled cavity.Wherein, double tunning absorbing cavity 110 resonance simultaneously is in TM110Pattern and TM210Pattern.
In the present embodiment, double tunning absorbing cavity 110 resonance simultaneously is at TM110Pattern and TM210Pattern, can suppress effectively
Double-gap coupling cavity of multiple-beam klystron 200 has the vibration of two non-operating modes of 2 π mould field shape distributions, eliminates by such
The unstability of the multiple-beam klystron that vibration causes, reduces sundry spectrum level simultaneously.
Hereinafter each ingredient of the present embodiment absorbing cavity device 100 and gap coupled cavity 200 is carried out in detail
Explanation.
Refer to Fig. 1, double tunning absorbing cavity 110 includes: cavity 111 and chamber lid 112.This cavity 111 and chamber lid 111 are common
Constitute the rectangular cavity of hollow.
It should be noted that the size of this rectangular cavity and double-gap coupling cavity of multiple-beam klystron need to absorb two non-
The frequency of mode of operation is relevant.Those skilled in the art can design this rectangular cavity according to the difference of the frequency of work
Length, width and height parameter, the most no longer illustrate.
At the chamber lid 111 of double tunning absorbing cavity and the blind end of the cavity 112 of double tunning absorbing cavity with near blind end one
Coating sintering microwave attenuating material 113 in the cavity wall of the surrounded surface of side.Microwave attenuating material 113 is FeSiAl attenuating material.
Certainly the present invention can also use other kinds of attenuating material, as long as it meets relative dielectric constant δ, loss tangent △ completely
Foot: 20≤δ≤25,0.6≤△≤0.8.Length Ls of microwave attenuating material is coated with double along the long limit of double tunning absorbing cavity
The ratio of length L on the tuning long limit of absorbing cavity meets: 0.6≤Ls/L≤0.8。
It should be noted that the area of coating sintering microwave attenuating material 113 is the bigger the better, but in order to avoid double tunning
Between absorbing cavity 110 and gap coupled cavity 200, the microwave attenuating material of coupling aperture position affects main mould, in the present embodiment, only
The portion of double tunning absorbing cavity 110 is coated with microwave attenuating material 113.In addition it will be apparent to those skilled in the art that
As long as the area of this double tunning absorbing cavity 110 coats this microwave attenuating material, without have to strictly meet this reality
Execute the region and area mentioned in example.
Fig. 2 A is the longitudinal sectional view after the present embodiment absorbing cavity device assembles with double-gap coupling cavity of multiple-beam klystron.Figure
2B is the transverse sectional view after absorbing cavity device shown in Fig. 1 assembles with double-gap coupling cavity of multiple-beam klystron.Below in conjunction with Fig. 2 A
With shape and the structure that Fig. 2 B introduces coupled waveguide 120.
As shown in Figure 2 A and 2 B, the position that the right side of double-gap coupling cavity of multiple-beam klystron 200 is corresponding with coupling slot is opened
Having the second rectangular waveguide hole 122, this second rectangular waveguide hole 122 is along the outside towards double-gap coupling cavity of multiple-beam klystron 200
Direction, the width of broadside is gradually increased.This second rectangular waveguide hole 122 constitutes the left side rectangular waveguide of rectangle coupled waveguide 120
Part.
As shown in Figure 2 A and 2 B, the right side of double tunning absorbing cavity 110 is closed, and left side is just to the second rectangular waveguide hole 122
Position have the first rectangular waveguide hole 121.The width value W of this first rectangular waveguide hole 121 broadside is constant, equal to the second rectangle
The width value of waveguide aperture the widest part broadside, this width value W meets and double-gap coupling cavity of multiple-beam klystron 200 operation wavelength λ0's
Ratio W/ λ0Should be less than 0.4.
After the present embodiment absorbing cavity device 100 and double-gap coupling cavity of multiple-beam klystron 200 are assembled, the first rectangle
Waveguide aperture 121 and the second rectangular waveguide hole 122 are directed at, and its periphery seals and coordinates, the rectangle coupled waveguide 120 of composition.
In the present embodiment, based on required degree of coupling parameter, the second rectangle on the right side of double-gap coupling cavity of multiple-beam klystron
The width of waveguide aperture 122 broadside is gradually increased towards outside width.It will be understood by those skilled in the art that this rectangular waveguide hole
Size is relevant with the degree of coupling, and width is the biggest, and the degree of coupling is the biggest, and in view of the dimensional requirement of whole multiple-beam klystron, this width
In limited range can only be accomplished the biggest.And require width W and double-gap coupling cavity of multiple-beam klystron 200 operation wavelength λ0's
Ratio W/ λ0Should be less than 0.4, be then to avoid other Mode Coupling are gone out gap coupled cavity.
Additionally, the height d of the first rectangular waveguide hole 121 and the second rectangular waveguide hole 122 remains constant, this height d
Height d with the coupling slot of double-gap coupling cavity of multiple-beam klystron 200cRatio d/dcBetween 0.5～0.65.
Double tunning absorbing cavity chamber lid 112 has two screws, by these two screws, respectively to double tunning absorbing cavity
It is inserted into the first tuning screw 114 and second tune screw 115.
First tuning screw 114 and second tune screw 115 are respectively positioned on double tunning absorbing cavity broadside, and (vertical double tunning absorbs
Cavity axis direction) center, both, in the projection of horizontal plane, fall in the level through above-mentioned first rectangular waveguide hole 121 center
On line.
From the point of view of the first tuning screw 114, it is positioned at the long limit of double tunning absorbing cavity and (is parallel to double tunning absorbing cavity axis
Direction) immediate vicinity, in the present embodiment, distance L of the first tuning screw 114 and the described unclosed end of double tunning absorbing cavity1、
Diameter D1Meet: 0.28L≤D1≤ 0.36L, 0.4L≤L1≤ 0.45L, wherein, L is the length on the long limit of rectangular cavity.
This first tuning screw 114 finely tunes TM in double tunning absorbing cavity 110 by capacitance tuning110The resonance frequency of pattern
Rate so that it is be distributed non-operating mode TM with having 2 π mould field shapes in gap coupled cavity 200010Mould resonance.
From the point of view of second tune screw 115, it is positioned near at the 3/4 of the long limit of double tunning absorbing cavity, in the present embodiment,
Second tune screw 115 and distance L of the unclosed end of double tunning absorbing cavity 1102, diameter D2Meet: 0.16L≤D2≤ 0.24L,
0.7L≤L2≤0.75L。
Second tune screw 115 finely tunes double tunning absorbing cavity TM by capacitance tuning210The resonant frequency of pattern so that it is
It is distributed non-operating mode TM with gap coupled cavity has 2 π mould field shapes110Mould resonance.
It should be noted that it is to debug in the later stage that this two tuning screw 114 and 115 enters the degree of depth in double tunning absorbing cavity
During determine, the most concrete scope.As long as finally realize after its debugging this double tunning absorbing cavity resonance simultaneously in
TM110Pattern and TM210Pattern is the most permissible.After debugging completes, this first tuning screw and second tune screw welding are in double
On tuning absorbing cavity 110, the degree of depth being inserted keeps constant.
Refer to Fig. 2 A and Fig. 2 B, multiple-beam klystron Double-gap output cavity 200 includes: cavity 210, upper chamber cover 220, cavity of resorption
Lid 230, three surrounds closing one output cavity jointly.This output cavity is coupled diaphragm 240, and to be divided into the double gap of up-down structure defeated
Go out chamber.
Radial outer periphery at coupling iris 240 arranges symmetrical two arc coupling slots (241 and 242).Wherein, right side
Arc coupling slot 241 be directed at the second rectangular waveguide hole 122.On the left of this second rectangular waveguide hole 122 and double tunning absorbing cavity
First rectangular waveguide hole 121 is alignd.The position of left side arc coupling slot 242 arranges coupling ring 243, and this gap coupled cavity works
The power of pattern outwards exports by this coupling ring 243 and via the output rectangular waveguide 244 that this coupling ring is peripheral.
Additionally, for the needs assembled, arrange positioning step at gap coupled cavity towards the side tuning absorbing cavity
211, when assembling, this double tunning absorbing cavity is snapped in this positioning step 211, is beneficial to two rectangular waveguide hole 121 and 122
Location and alignment.
In the present embodiment, double tunning absorbing cavity 110, the material of tuning screw 114 and 115 are oxygen-free copper.Introduced below
The assembling process of the present embodiment absorbing cavity device: first, at cavity 111, the region of interest coating sintering microwave attenuation of chamber lid 112
Material；Then, cavity 111 and chamber lid 112 are welded together, constitute double tunning absorbing cavity 110；After again, double tunning is absorbed
Chamber 110 snaps on the positioning step 211 on the right side of double-gap coupling cavity of multiple-beam klystron 200, the first rectangular waveguide hole 121 and second
Rectangular waveguide hole 122 is alignd, and both is welded.
So far, the absorbing cavity device of the present embodiment suppression double-gap coupling cavity of multiple-beam klystron 2 pi-mode oscillation is introduced complete.
In another exemplary embodiment of the present invention, additionally provide the adjustment method of a kind of above-mentioned absorbing cavity device,
This adjustment method includes: convert the first tuning screw 114 and that second tune screw 115 inserts in double tunning absorbing cavity 110 is deep
Degree, finds and makes double tunning absorbing cavity resonance simultaneously at TM110Pattern and TM210The position of pattern, after finding, by the first tuning spiral shell
Nail 114 and second tune screw 115 are welded on cavity 111.
So far, the adjustment method of the absorbing cavity device of the present embodiment suppression double-gap coupling cavity of multiple-beam klystron 2 pi-mode oscillation
Introduce complete
So far, already in connection with accompanying drawing, two embodiments of the present invention have been described in detail.According to above description, this area
The present invention should be suppressed the absorbing cavity device of gap coupled cavity 2 pi-mode oscillation and adjustment method thereof to have clear by technical staff
Understanding.
Additionally, the above-mentioned definition to each element and method is not limited in various concrete structures, the shape mentioned in embodiment
Shape or mode, it can be changed or replace, such as by those of ordinary skill in the art simply: (1) above-described embodiment is with many
Illustrating as a example by beam klystron gap coupled cavity, the present invention is equally applicable for other kinds of gap coupled cavity, this
Skilled person is it should be clear that here is omitted.
In sum, the present invention is by selecting the shape and size of absorbing cavity, coating material parameter, and regulates tuning screw
Diameter, position and insertion double tunning absorbing cavity in the degree of depth, make double tunning absorbing cavity simultaneously resonance at TM110Pattern and
TM210The positions and dimensions of pattern, can suppress have 2 π mould fields in double-gap coupling cavity of multiple-beam klystron output circuit effectively
The vibration of two non-operating modes of shape distribution, eliminates the unstability of the multiple-beam klystron caused by such vibration, drops simultaneously
Low sundry spectrum level, the loading to the mode of operation with the shape distribution of π mould field is the least simultaneously.
Particular embodiments described above, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail
Describe in detail bright, be it should be understood that the specific embodiment that the foregoing is only the present invention, be not limited to the present invention, all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included in the guarantor of the present invention
Within the scope of protecting.
Claims (9)
1. the absorbing cavity device suppressing gap coupled cavity 2 pi-mode oscillation, it is characterised in that including:
Double tunning absorbing cavity (110), closes resonator cavity for hollow, rectangular, and its first end seal is closed, at least part of face of cavity wall inside it
Long-pending have microwave attenuating material；
Rectangle coupled waveguide (120), is connected to the second end of described double tunning absorbing cavity (110) and described gap coupled cavity
(200), between, the just coupling slot to described gap coupled cavity (200) side, for described double tunning absorbing cavity (110) and double
Mode Coupling between gap coupled cavity (200)；
Wherein, described double tunning absorbing cavity (110) two screws opened above, by these two screws, respectively to described double tune
The first tuning screw (114) and second tune screw (115), wherein, these two spiral shells is inserted vertically downward in humorous absorbing cavity (110)
Hole is respectively positioned on the center of described double tunning absorbing cavity (110) broadside, makes this double tunning absorbing cavity (110) resonance simultaneously in TM110Mould
Formula and TM210Pattern；
Wherein, the diameter D of described first tuning screw (114)1, with distance L of described double tunning absorbing cavity (100) second end1Full
Foot: 0.28L≤D1≤ 0.36L, 0.4L≤L1≤0.45L；The diameter D of described second tune screw (115)2, with described double tunning
Distance L of absorbing cavity (100) second end2Meet: 0.16L≤D2≤ 0.24L, 0.7L≤L2≤0.75L；L is that described double tunning is inhaled
Receive the length on long limit, chamber.
Absorbing cavity device the most according to claim 1, it is characterised in that the first end of described double tunning absorbing cavity (110)
With microwave attenuating material described in the cavity wall coating sintering near the first side surrounding.
Absorbing cavity device the most according to claim 2, it is characterised in that the relative dielectric constant of described microwave attenuating material
δ, loss tangent △ meet: 20≤δ≤25,0.6≤△≤0.8.
Absorbing cavity device the most according to claim 3, it is characterised in that described microwave attenuating material is FeSiAl material.
Absorbing cavity device the most according to claim 3, it is characterised in that the coated length of described microwave attenuation meets: 0.6
≤Ls/L≤0.8；
Wherein, LsFor the length along described double tunning absorbing cavity long limit coating microwave attenuating material, L is described double tunning absorbing cavity
The length on long limit.
Absorbing cavity device the most according to claim 1, it is characterised in that:
The second rectangular waveguide hole (122) is offered in the position that described gap coupled cavity (200) is corresponding with described coupling slot；
The second of described double tunning absorbing cavity (110) is rectified the position to described second rectangular waveguide hole (122) and offers the first square
Shape waveguide aperture (121)；
Described first rectangular waveguide hole (121) and the second rectangular waveguide hole (122) alignment, its periphery seals and coordinates, constitutes
Described rectangle coupled waveguide (120).
Absorbing cavity device the most according to claim 6, it is characterised in that described second rectangular waveguide hole (122) along towards
The lateral direction of gap coupled cavity, the width value of broadside is gradually increased；
The width value W of described first rectangular waveguide hole (111) broadside is constant, equal to described second rectangular waveguide hole the widest part broadside
Width value,
Wherein, the width value W of described first rectangular waveguide hole (111) broadside meets: W/ λ0≤ 0.4, λ0Couple for described double gap
The operation wavelength in chamber (200).
Absorbing cavity device the most according to any one of claim 1 to 7, it is characterised in that described gap coupled cavity is
The gap coupled cavity of multiple-beam klystron.
9. the adjustment method of absorbing cavity device according to any one of a claim 1 to 7, it is characterised in that including:
Adjust that described first tuning screw (114) and second tune screw (115) insert in double tunning absorbing cavity (110) is deep
Degree, finds and makes this double tunning absorbing cavity (110) resonance simultaneously at TM110Pattern and TM210The position of pattern, find this position it
After, described first tuning screw (114) and second tune screw (115) are welded on described double tunning absorbing cavity (110).
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