JPH0578890B2 - - Google Patents
Info
- Publication number
- JPH0578890B2 JPH0578890B2 JP13742386A JP13742386A JPH0578890B2 JP H0578890 B2 JPH0578890 B2 JP H0578890B2 JP 13742386 A JP13742386 A JP 13742386A JP 13742386 A JP13742386 A JP 13742386A JP H0578890 B2 JPH0578890 B2 JP H0578890B2
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- cavity wall
- bellows
- support rod
- capacitor plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003990 capacitor Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Microwave Tubes (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は大電力クライストロンの空胴に関し、
特に超大電力を扱う空胴の同調周波数可変機構に
関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high power klystron cavity;
In particular, it relates to a tuning frequency variable mechanism for cavities that handle extremely high power.
大電力多空胴形クライストロンは、高利得、高
効率ではあるが、帯域幅が狭いため、空胴にはそ
の共振周波数を変化させるための同調可変機構を
有するのが一般的である。空胴の共振周波数を変
化させるには、空胴のインダクタンス分を変化さ
せる方法、あるいはキヤパシタンスを変化させる
方法あるいはその両方の変化させる方法があり、
それぞれクライストロンに応用されている。
A high-power multi-cavity klystron has high gain and high efficiency, but has a narrow bandwidth, so the cavity generally has a variable tuning mechanism to change its resonant frequency. To change the resonant frequency of the cavity, there are two methods: changing the inductance of the cavity, changing the capacitance, or both.
Each is applied to klystrons.
第２図はキヤパシタンスを変化させて空胴の共
振周波数を可変する従来の例を示す。第２図にお
いて１は空胴壁、２はドリフト管、３は容量板、
５はベローズを示す。容量板をドリフト管に近づ
けることにより、空胴のキヤパシタンス分が増大
して空胴の共振周波数を低下させることができ
る。第２図の空胴は、ベローズが空胴内にあるた
め空胴内の高周波電流がベローズを流れ、大電力
クライストロンの場合は、ベローズが溶けてしま
うという問題があつた。さらに、第３図は、ベロ
ーズを空胴壁外に配置した構造の従来例である
が、この場合も容量板支持棒４と空胴壁部間隙よ
り高周波電流がベローズ部へ流入するとか、ベロ
ーズ部での共振によりベローズが放電したり、溶
融したりすることがあつた。 FIG. 2 shows a conventional example in which the resonant frequency of the cavity is varied by changing the capacitance. In Fig. 2, 1 is a cavity wall, 2 is a drift tube, 3 is a capacitor plate,
5 indicates a bellows. By bringing the capacitive plate closer to the drift tube, the capacitance of the cavity increases and the resonant frequency of the cavity can be lowered. In the cavity shown in FIG. 2, since the bellows is located inside the cavity, a high frequency current inside the cavity flows through the bellows, and in the case of a high-power klystron, there is a problem that the bellows melts. Furthermore, although FIG. 3 shows a conventional example of a structure in which the bellows is disposed outside the cavity wall, in this case as well, high-frequency current flows into the bellows part from the gap between the capacitive plate support rod 4 and the cavity wall. There were cases where the bellows discharged or melted due to resonance in the parts.
本発明は、複数個の空胴よりなる高周波回路部
を有する大電力クライストロンにおいて空胴は容
量板と容量板支持棒とを有し、(イ)容量板支持棒は
空胴壁を非接触で貫通し、空胴壁穴のほぼ中央に
配置する。また、(ロ)容量板支持棒の直径と空胴壁
穴の直径の寸法を動作周波数の３倍のTE11波に
対してカツトオフになるように決める。(ハ)ベロー
ズは、空胴壁外に配置され、ベローズ部での
TE11波、TEM波による共振がない様にベローズ
部形状を選定することを特徴とする。
The present invention provides a high-power klystron having a high-frequency circuit section consisting of a plurality of cavities, in which the cavity has a capacitor plate and a capacitor plate support rod, and (a) the capacitor plate support rod can touch the cavity wall without contacting it. Penetrate and place approximately in the center of the cavity wall hole. (b) The diameter of the capacitor plate support rod and the diameter of the cavity wall hole are determined so as to provide a cut-off for the TE 11 wave, which is three times the operating frequency. (c) The bellows is placed outside the cavity wall, and the bellows
The feature is that the shape of the bellows part is selected so that there is no resonance due to TE 11 waves and TEM waves.
ここで、容量板支持棒と、空胴壁を非接触にす
るのは、容量板の動きを機械的に容易にするため
であり、また、支持棒を中央に配置するのは、空
胴壁間隙より見ると、空胴内部の高周波電流は、
TE波となり、TEM波とはならないからである。
もちろん、完全に中央に配置することは、できな
いので、偏心分は、TEM波としてベローズ側へ
流入する。さらに、３倍液までに限つているのは
クライストロンにおいては、それ以上の波は、か
なり、低レベルとなり、実用上、超大電力クライ
ストロンでも、問題とはならないからである。 Here, the reason why the capacitor plate support rod and the cavity wall are not in contact is to mechanically facilitate the movement of the capacitor plate, and the reason why the support rod is placed in the center is to make the cavity wall non-contact. Viewed from the gap, the high frequency current inside the cavity is
This is because it becomes a TE wave and not a TEM wave.
Of course, it is not possible to place it perfectly in the center, so the eccentricity flows into the bellows side as a TEM wave. Furthermore, the reason why the liquid is limited to 3x liquid is that in a klystron, waves beyond that level will be at a considerably low level, and will not pose a problem in practice even in an ultra-high power klystron.
次に、本発明について図面を参照して説明す
る。
Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例の縦断面図である。
第１図において空胴壁１、ドリフト管２および容
量板３で空胴を構成し、容量板支持棒４は空胴壁
を貫通して外部に突出ており、ベローズ５によつ
て密封されている。容量板支持棒４を外部より駆
動し、共振周波数を変化させる。 FIG. 1 is a longitudinal sectional view of one embodiment of the present invention.
In FIG. 1, a cavity wall 1, a drift tube 2, and a capacitive plate 3 constitute a cavity, and a capacitive plate support rod 4 penetrates the cavity wall and protrudes to the outside, and is sealed by a bellows 5. There is. The capacitive plate support rod 4 is driven from the outside to change the resonance frequency.
空胴の共振周波数をf0とすると、波長λはλ＝
Ｃ／f0となる（Ｃは光速）。 If the resonant frequency of the cavity is f 0 , the wavelength λ is λ=
C/f 0 (C is the speed of light).
今、3f0まで考慮すると、TE11波に対するカツ
トオフ波長λcはλc≒２／π（Ａ＋Ｂ）であるから
（Ａ＋Ｂ）＜２／π・Ｃ
3f0を満足する様にＡ、Ｂを決め
ている。 Now, considering up to 3f 0 , the cutoff wavelength λ c for the TE 11 wave is λ c ≒ 2/π (A + B), so A and B are determined to satisfy (A + B) < 2/π・C 3f 0 . ing.
ここでＡは容量板支持棒の直径、Ｂは空胴壁穴
の直径である。このようにＡ、Ｂを決めると、
TE11波はカツトオフされベローズ側へ流出しな
い。 Here, A is the diameter of the capacitive plate support rod, and B is the diameter of the cavity wall hole. If A and B are determined in this way,
TE 11 wave is cut off and does not flow to the bellows side.
また、ベローズ部に対しては、カツトオフ波長
λcは、λc≒２／π（Ａ＋Ｄ）であるから、
管内波長λgは、
λｇ＝λ／３／√１−（λ／３／λc）2となる。べロ
ーズ
の長さをｌとすると、ｌ＜１／２λgとなる様に、ｌ、
Ｄが決められる。ここでＤはベローズと平均径で
ある。このように、ｌ、Ｄを決めるとベローズ部
の空間でTE波の共振は起こらない。また、TEM
波についても、ｌ＜１／２（λ／３）となる様にｌ
を決める。このためTEM波の共振も生じない。 Also, for the bellows part, the cutoff wavelength λ c is λ c ≒ 2/π (A + D), so the pipe wavelength λ g is λ g = λ/3/√1 - (λ/3/λ c ) becomes 2 . Letting the length of the bellows be l, l and D are determined so that l<1/2λ g . Here, D is the average diameter of the bellows. In this way, if l and D are determined, TE wave resonance will not occur in the space of the bellows part. Also, T.E.M.
Regarding waves, l is also determined so that l<1/2 (λ/3). Therefore, resonance of TEM waves does not occur.
以上説明したように、Ａ、Ｂ、Ｃ、Ｄ、ｌを決
めることにより、空胴内の電磁界がベローズに流
入するエネルギーを少なくし、またベローズ部で
の共振がさけられるため、ベローズ部の熱的溶
融、電界的放電のない安定した共振周波数可変形
大電力多空胴形クライストロンを実現することが
できる。
As explained above, by determining A, B, C, D, and l, the energy of the electromagnetic field in the cavity flowing into the bellows can be reduced, and resonance in the bellows can be avoided, so that A stable resonant frequency variable high power multi-cavity klystron without thermal melting or electric field discharge can be realized.
第１図は本発明のクライストロンに用いる空胴
共振器を示す縦断面図、第２図、第３図は従来の
空胴共振器の縦断面図である。
１……空胴壁、２……ドリフト管、３……容量
板、４……容量板支持棒、５……ベローズ。
FIG. 1 is a longitudinal sectional view showing a cavity resonator used in the klystron of the present invention, and FIGS. 2 and 3 are longitudinal sectional views of a conventional cavity resonator. 1... Cavity wall, 2... Drift tube, 3... Capacity plate, 4... Capacity plate support rod, 5... Bellows.
Claims (1)
大電力クライストロンにおいて、前記空胴が、容
量板と、この容量板を支持する容量板支持棒を有
し、該容量板支持棒が空胴壁と非接触で空胴壁穴
中央を貫通し空胴壁外で、ベローズにより真空封
止される構造よりなり、かつ、空胴壁と容量板支
持棒間の間隙が、３倍の周波数のTE11波をカツ
トオフする寸法比を有し、また、ベローズ部の長
さが動作周波数の３倍のTEM波の管内波長の1/2
以内であることを特徴とする大電力クライストロ
ン。1. In a high-power klystron having a high frequency circuit section consisting of a plurality of cavities, the cavity has a capacitor plate and a capacitor plate support rod that supports the capacitor plate, and the capacitor plate support rod is attached to the cavity wall. The structure is such that the hole in the cavity wall is penetrated through the center of the hole in the cavity wall without contact with the cavity wall, and the gap between the cavity wall and the capacitive plate support rod is vacuum-sealed by a bellows. It has a dimension ratio that cuts off 11 waves, and the length of the bellows part is 1/2 of the tube wavelength of the TEM wave, which is three times the operating frequency.
A high-power klystron characterized by being within.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13742386A JPS62295336A (en) | 1986-06-12 | 1986-06-12 | Large power klystron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13742386A JPS62295336A (en) | 1986-06-12 | 1986-06-12 | Large power klystron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62295336A JPS62295336A (en) | 1987-12-22 |
| JPH0578890B2 true JPH0578890B2 (en) | 1993-10-29 |
Family
ID=15198281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13742386A Granted JPS62295336A (en) | 1986-06-12 | 1986-06-12 | Large power klystron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62295336A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2713185B2 (en) * | 1994-10-31 | 1998-02-16 | 日本電気株式会社 | Multi-cavity klystron |
| GB2423186B (en) | 2005-02-11 | 2009-06-03 | E2V Tech | Magnetic assembly for a linear beam tube |
| GB0503332D0 (en) * | 2005-02-17 | 2005-03-23 | E2V Tech Uk Ltd | Inductive output tube tuning arrangement |
-
1986
- 1986-06-12 JP JP13742386A patent/JPS62295336A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62295336A (en) | 1987-12-22 |
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