JPH0412581B2 - - Google Patents
Info
- Publication number
- JPH0412581B2 JPH0412581B2 JP15061484A JP15061484A JPH0412581B2 JP H0412581 B2 JPH0412581 B2 JP H0412581B2 JP 15061484 A JP15061484 A JP 15061484A JP 15061484 A JP15061484 A JP 15061484A JP H0412581 B2 JPH0412581 B2 JP H0412581B2
- Authority
- JP
- Japan
- Prior art keywords
- electron beam
- focusing device
- permanent magnet
- outer periphery
- pole piece
- 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
Links
- 238000010894 electron beam technology Methods 0.000 claims description 24
- 239000000696 magnetic material Substances 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 230000017525 heat dissipation Effects 0.000 description 5
- 230000005389 magnetism Effects 0.000 description 5
- LTPBRCUWZOMYOC-UHFFFAOYSA-N Beryllium oxide Chemical compound O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
- H01J23/087—Magnetic focusing arrangements
- H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing
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、電子ビーム管の周期永久磁石
（PPM）を使用した電子ビーム集束装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electron beam focusing device using a periodic permanent magnet (PPM) of an electron beam tube.
（従来の技術）
進行波管は電子ビームを射出する電子銃、電子
ビームとの相互作用により回路波を増幅させる遅
波回路部、遅波回路に沿つて電子ビームを集束さ
せるための磁界を与える電子ビーム集束装置、そ
して相互作用を終つた電子ビームを捕捉するコレ
クタなどから構成されている。(Prior art) A traveling wave tube includes an electron gun that emits an electron beam, a slow wave circuit that amplifies the circuit wave by interaction with the electron beam, and a magnetic field that provides a focus for the electron beam along the slow wave circuit. It consists of an electron beam focusing device, a collector that captures the electron beam after interaction, and so on.
進行波管の電子ビーム集束装置には、電磁石や
永久磁石を用いた一様磁界分布のものと、磁界の
方向が交互に変化する周期永久磁石（PPM）を
用いたものがある。一様磁界集束装置に比べて
PPM集束装置は小形軽量に構成できる特徴があ
り、小電力進行波管だけでなく最近では大電力進
行波管にも広く用いられるようになつて来た。こ
の従来のPPM集束装置は、円環状永久磁石とポ
ールピースとを交互に重ねて作られており、永久
磁石とポールピースの外周の直径は同じか、また
はポールピースが永久磁石より小さく作られてい
る。 Traveling wave tube electron beam focusing devices include those that use electromagnets or permanent magnets with a uniform magnetic field distribution, and those that use periodic permanent magnets (PPM) that alternately change the direction of the magnetic field. Compared to uniform field focusing devices
PPM focusing devices have the characteristic of being compact and lightweight, and have recently come to be widely used not only for low-power traveling wave tubes but also for high-power traveling wave tubes. This conventional PPM focusing device is made by stacking annular permanent magnets and pole pieces alternately, and the outer diameters of the permanent magnet and pole piece are the same, or the pole piece is made smaller than the permanent magnet. There is.
（発明が解決しようとする問題点）
しかし、PPM集束装置は小さい磁石で強い磁
界を得るため、遅波回路と一体化ないし密着して
構成されるので、大電力進行波管の場合、PPM
集束装置からの放熱が十分でないと、磁石は温度
上昇により減磁し、電子ビームの集束が不十分に
なる。一旦、減磁すると電子ビームが遅波回路に
衝突しやすくなるので、磁石の温度上昇は更に大
きくなるという悪循環に陥る。すなわち、大電力
進行波管のPPM集束装置では、電子ビームの透
過を良くし、電子ビームの遅波回路への衝突によ
る発熱が少なくするとともに、PPM集束装置か
らの放熱を良くする必要がある。PPM集束装置
の場合、電子ビームの透過はPPMを構成する磁
石の偏磁の影響を補正することにより改善でき
る。しかし、従来技術によるPPM集束装置では、
磁石とポールピースの外周面が同一かあるいは磁
石の外周面がポールピースの外周面より大きいの
で、偏磁の影響を補正する目的で磁石の外周面に
鉄などの磁性体によるシヤントを取付けると、
PPM集束装置の外周面が一様でなくなるため、
放熱が十分にできなくなるという問題がある。ま
た、放熱を優先して、PPM集束装置の外周面に
放熱体を先に取付けると磁石に直接シヤントを取
付けることができないため、偏磁の補正が不十分
になるという別の問題が生じる。(Problem to be solved by the invention) However, in order to obtain a strong magnetic field with a small magnet, the PPM focusing device is configured to be integrated with or in close contact with the slow wave circuit, so in the case of a high power traveling wave tube, the PPM
If heat dissipation from the focusing device is not sufficient, the magnet will demagnetize due to temperature increase, resulting in insufficient focusing of the electron beam. Once demagnetized, the electron beam is more likely to collide with the slow-wave circuit, resulting in a vicious cycle in which the magnet's temperature rise further increases. That is, in a PPM focusing device using a high-power traveling wave tube, it is necessary to improve electron beam transmission, reduce heat generation due to collision of the electron beam with a slow wave circuit, and improve heat dissipation from the PPM focusing device. In the case of a PPM focusing device, the transmission of the electron beam can be improved by correcting the influence of the biased magnetism of the magnets that make up the PPM. However, in the conventional PPM focusing device,
Since the outer circumferential surfaces of the magnet and the pole piece are the same or the outer circumferential surface of the magnet is larger than the outer circumferential surface of the pole piece, if a shunt made of a magnetic material such as iron is attached to the outer circumferential surface of the magnet in order to correct the influence of biased magnetism,
Because the outer peripheral surface of the PPM focusing device is not uniform,
There is a problem that heat dissipation is not sufficient. Furthermore, if heat dissipation is prioritized and a heat dissipation body is attached to the outer peripheral surface of the PPM focusing device first, it is not possible to attach a shunt directly to the magnet, which causes another problem of insufficient correction of biased magnetism.
本発明の目的は、大電力進行波管のPPM集束
装置において、電子ビームの透過と放熱の問題を
同時に解決する構成を有するPPM集束装置を提
供することである。 An object of the present invention is to provide a PPM focusing device for a high-power traveling wave tube having a configuration that simultaneously solves the problems of electron beam transmission and heat radiation.
（問題点を解決するための手段）
本発明は、永久磁石とポールピースとを交互に
組合せて構成した進行波管などの電子ビーム管に
用いる周期磁界形電子ビーム集束装置において、
ポールピースの外周の直径を永久磁石の外周の直
径より大きくし、電子ビーム集束装置の外周に放
熱体を設けるとともに、永久磁石と放熱体との間
隙部に磁性体および非磁性金属体を挿入したこと
を特徴とする。(Means for Solving the Problems) The present invention provides a periodic magnetic field type electron beam focusing device used in an electron beam tube such as a traveling wave tube configured by alternately combining permanent magnets and pole pieces.
The diameter of the outer periphery of the pole piece is made larger than the diameter of the outer periphery of the permanent magnet, a heat radiator is provided around the outer periphery of the electron beam focusing device, and a magnetic material and a non-magnetic metal material are inserted into the gap between the permanent magnet and the heat radiator. It is characterized by
（実施例）
第１図は本発明を実施した大電力進行波管の
PPM集束装置の構成を示す管軸に沿つた１部分
の軸断面図である。大電力進行波管１は遅波回路
がヘリツクス２と誘電体支持体３、金属外囲器４
から成り、PPM集束装置は金属外囲器４に密着
するポールピース５と永久磁石６、永久磁石の偏
磁を補正する鉄などの磁性体のシヤント７と銅や
アルミなどの熱伝導の良い非磁性金属体８そして
放熱体９から構成されている。遅波回路における
発熱源はヘリツクス２であるが、これは高周波損
失による分と電子ビームの衝突による分の２つが
考えられる。ヘリツクス２で発生した熱はすみや
かに外部に放熱しないと、ヘリツクス２が溶断し
てしまうので、誘電体支持体３にはベリリヤ
（BeO）などの熱伝導の良い材料を用い、またヘ
リツクス２と誘電体支持体３の間、また誘電体支
持体３と金属外囲器４との間の接触熱抵抗を低く
している。更に、金属外囲器４にポールピース５
を密着させ、ポールピース５の外周面には放熱体
９を取付けることにより効果的に熱を放散できる
よう構成している。その上、ポールピース５の外
周面の直径より永久磁石６の外周面の直径を小さ
くすることにより形成された間隙にシヤント７と
非磁性金属体８を取付け、ポールピース５から放
熱体９への熱伝導を阻害することなく、永久磁石
６の偏磁を補正し良好な電子ビームの透過を実現
している。しかも、シヤント７と非磁性金属体８
の厚みを間隙の幅に合せることによつて永久磁石
６を通じての熱を伝導できるという効果も得られ
る。(Example) Figure 1 shows a high-power traveling wave tube implementing the present invention.
FIG. 2 is an axial cross-sectional view of a portion along the tube axis showing the configuration of the PPM focusing device. The high power traveling wave tube 1 has a slow wave circuit consisting of a helix 2, a dielectric support 3, and a metal envelope 4.
The PPM focusing device consists of a pole piece 5 and a permanent magnet 6 that are in close contact with a metal envelope 4, a shunt 7 made of a magnetic material such as iron to correct the biased magnetization of the permanent magnet, and a non-magnetic material such as copper or aluminum with good thermal conductivity. It is composed of a magnetic metal body 8 and a heat sink 9. The heat generation source in the slow wave circuit is the helix 2, and this is thought to be caused by two parts: one due to high frequency loss and the other due to collision of the electron beam. If the heat generated in the helix 2 is not dissipated to the outside quickly, the helix 2 will melt, so a material with good thermal conductivity such as beryllia (BeO) is used for the dielectric support 3, and the helix 2 and the dielectric The contact thermal resistance between the body supports 3 and between the dielectric support 3 and the metal envelope 4 is reduced. Furthermore, a pole piece 5 is attached to the metal envelope 4.
The pole pieces 5 are brought into close contact with each other, and a heat radiator 9 is attached to the outer peripheral surface of the pole piece 5 so that heat can be effectively dissipated. Moreover, the shunt 7 and the non-magnetic metal body 8 are attached to the gap formed by making the diameter of the outer circumferential surface of the permanent magnet 6 smaller than the diameter of the outer circumferential surface of the pole piece 5, and the shunt 7 and the non-magnetic metal body 8 are attached to The biased magnetism of the permanent magnet 6 is corrected and good electron beam transmission is achieved without impeding heat conduction. Moreover, the shunt 7 and the non-magnetic metal body 8
By adjusting the thickness of the permanent magnet 6 to the width of the gap, it is also possible to conduct heat through the permanent magnet 6.
第２図は第１図のＡ−Ａ断面図であり、シヤン
ト７と非磁性金属体８、放熱体９の構成を分りや
すく示したものである。この実施例ではシヤント
７は円周上に４つ取付けられており、また放熱体
９は放熱翼型のものである。 FIG. 2 is a sectional view taken along the line AA in FIG. 1, and clearly shows the structure of the shunt 7, the nonmagnetic metal body 8, and the heat sink 9. In this embodiment, four shunts 7 are installed on the circumference, and the heat radiating body 9 is of a heat radiating airfoil type.
なお、本発明は遅波回路がここに示したヘリツ
クス形だけでなく空胴結合形のものにも容易に適
用できる。 Note that the present invention can be easily applied not only to the helix type slow wave circuit shown here but also to a cavity coupled type slow wave circuit.
（発明の効果）
以上詳述したように、本発明によれば、電子ビ
ーム管のPPM集束装置において、ポールピース
の外周面の直径を永久磁石の外周面の直径より大
きくし、これらの外周に放熱体を取付けるととも
に、永久磁石と放熱体の間隙に磁性体および非磁
性金属体を挿入しているのでヘリツクスで発生し
た熱をすみやかに放散でき、また偏磁による電子
ビームの透過率の減少を容易に改善できる。(Effects of the Invention) As detailed above, according to the present invention, in a PPM focusing device for an electron beam tube, the diameter of the outer circumferential surface of the pole piece is made larger than the diameter of the outer circumferential surface of the permanent magnet, and In addition to installing a heat sink, magnetic and non-magnetic metal bodies are inserted into the gap between the permanent magnet and the heat sink, so the heat generated in the helix can be quickly dissipated, and the decrease in electron beam transmittance due to biased magnetism can be prevented. Can be easily improved.
第１図は本発明を実施した電子ビーム管の
PPM集束装置の構成を示す管軸に沿つた１部分
の軸断面図、第２図は第１図のＡ−Ａ断面図であ
る。
１……大電力進行波管、２……ヘリツクス、３
……誘電体支持体、４……金属外囲器、５……ポ
ールピース、６……永久磁石、７……シヤント、
８……非磁性金属体、９……放熱体。
Figure 1 shows an electron beam tube embodying the present invention.
FIG. 2 is an axial sectional view of a portion along the tube axis showing the configuration of the PPM focusing device, and FIG. 2 is a sectional view taken along the line AA in FIG. 1. 1...High power traveling wave tube, 2...Helix, 3
...dielectric support, 4...metal envelope, 5...pole piece, 6...permanent magnet, 7...shunt,
8... Non-magnetic metal body, 9... Heat sink.
Claims (1)
成した電子ビーム集束装置において、ポールピー
スの外周の直径より永久磁石の外周の直径を小さ
くし、ポールピースの外周に放熱体を取付けると
ともに、ポールピースの外周と永久磁石の外周と
の間隙に磁性体および熱伝導の良い非磁性金属体
を挿入したことを特徴とする電子ビーム集束装
置。1. In an electron beam focusing device configured by alternately combining permanent magnets and pole pieces, the diameter of the outer periphery of the permanent magnet is made smaller than the diameter of the outer periphery of the pole piece, a heat sink is attached to the outer periphery of the pole piece, and An electron beam focusing device characterized in that a magnetic material and a non-magnetic metal material with good thermal conductivity are inserted into the gap between the outer periphery and the outer periphery of a permanent magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15061484A JPS6129039A (en) | 1984-07-20 | 1984-07-20 | Device for forcusing electron beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15061484A JPS6129039A (en) | 1984-07-20 | 1984-07-20 | Device for forcusing electron beam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6129039A JPS6129039A (en) | 1986-02-08 |
| JPH0412581B2 true JPH0412581B2 (en) | 1992-03-05 |
Family
ID=15500724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15061484A Granted JPS6129039A (en) | 1984-07-20 | 1984-07-20 | Device for forcusing electron beam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6129039A (en) |
-
1984
- 1984-07-20 JP JP15061484A patent/JPS6129039A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6129039A (en) | 1986-02-08 |
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