JPS639983Y2 - - Google Patents
Info
- Publication number
- JPS639983Y2 JPS639983Y2 JP1275382U JP1275382U JPS639983Y2 JP S639983 Y2 JPS639983 Y2 JP S639983Y2 JP 1275382 U JP1275382 U JP 1275382U JP 1275382 U JP1275382 U JP 1275382U JP S639983 Y2 JPS639983 Y2 JP S639983Y2
- Authority
- JP
- Japan
- Prior art keywords
- tapered
- magnetic field
- electron beam
- annular permanent
- 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
- 230000000737 periodic effect Effects 0.000 claims description 25
- 238000010894 electron beam technology Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims 1
- 238000002834 transmittance Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- LTPBRCUWZOMYOC-UHFFFAOYSA-N Beryllium oxide Chemical compound O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910000833 kovar Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
Landscapes
- Microwave Tubes (AREA)
Description
【考案の詳細な説明】
本考案は、電子ビーム管の電子ビームを集束す
るために用いられる周期磁界装置の改良に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a periodic magnetic field device used to focus the electron beam of an electron beam tube.
周知のとおり、進行波管など比較的細長い高周
波回路の内部に電子ビームを通過させる電子ビー
ム管において、電子ビームを終始一定の径に集束
させる手段のひとつとして、一般的に周期磁界集
束装置が用いられる。 As is well known, in electron beam tubes such as traveling wave tubes that pass an electron beam through a relatively long and narrow high-frequency circuit, a periodic magnetic field focusing device is generally used as a means of focusing the electron beam to a constant diameter from beginning to end. It will be done.
周期磁界集束装置は複数個の円環状永久磁石
と、この円環状永久磁石間に同軸的に介在されて
いるポールピースとから構成され、ヘリツクスの
内側を通過する電子ビームと同軸的に配置されて
いる。この周期磁界を構成する円環状永久磁石を
回転させたり、電子ビーム軸に垂直な方向に移動
させてヘリツクスに当たる電子の数を極力少なく
するよう位置調整が成される。 The periodic magnetic field focusing device is composed of a plurality of annular permanent magnets and a pole piece coaxially interposed between the annular permanent magnets, and is arranged coaxially with the electron beam passing inside the helix. There is. The annular permanent magnet that forms this periodic magnetic field is rotated or moved in a direction perpendicular to the electron beam axis to adjust its position so as to minimize the number of electrons hitting the helix.
しかしながら、進行波管が受ける機械的衝撃
や、動作中に何らわの原因などで、円環状永久磁
石が調整された位置から少しでも動くと、電子ビ
ームと周期磁界集束装置との適切な位置関係がく
ずれて、ヘリツクスに当たる電子の数が多くなつ
て出力低下の要因となつたり、またヘリツクスが
電子ビームの衝突によつて高温に加熱されるため
に多量のガスを放出し、カソード劣化を招いて進
行波管の安定動作に著しい支障をきたすことにな
る。従がつて、このような不具合を避けるために
周期磁界集束装置を構成する部品は何らかの方法
で堅く固定されていなければならない。 However, if the annular permanent magnet moves even slightly from its adjusted position due to mechanical shock to the traveling wave tube or for some other reason during operation, the appropriate positional relationship between the electron beam and the periodic magnetic field focusing device may be affected. When the helix collapses, the number of electrons hitting the helix increases, causing a drop in output.Also, the helix is heated to a high temperature by the electron beam collision, releasing a large amount of gas, leading to cathode deterioration. This will seriously impede the stable operation of the traveling wave tube. Therefore, in order to avoid such problems, the parts constituting the periodic magnetic field focusing device must be firmly fixed in some way.
第１図は従来行なわれている周期磁界装置を進
行波管に用いた場合の１例を断面図で示したもの
である。進行波管１は電子ビームを発射する電子
銃１１、電子ビームを高周波と作用させるヘリツ
クス１２、および高周波増幅に寄与した後の電子
ビームを補獲するコレクタ１３とを含み、ヘリツ
クス１２は進行波管１の外囲器の一部を形成する
管状の外周管１４の内側に、ベリリア磁器などか
らなる複数個の支持棒１５を介して収納されてい
る。周期磁界集束装置２は、前記外周管１４の外
周上に予め装着された複数個のポールピース２１
の間に、円環状永久磁石２２を複数個（通常は２
分割）に分割した後、分割面に隙間が認められな
いように装着することによつて構成され、進行波
管軸上に電子ビームを集束するための周期磁界を
発生させる。この周期磁界集束装置２の両端部に
は、コバーなどの磁性材料で作られた管球の真空
外囲器の一部を形成する入力部磁気シールド１
６、および出力部磁気シールド１７が配設されて
いる。入力部磁気シールド１６および出力部磁気
シールド１７は、外周管１４の外周上にろう付な
どによつて固定され、これらの間に構成される周
期磁界集束装置２の円環状永久磁石２２およびポ
ールピース２１が互いに隙間を認めないで装着さ
れるような位置関係に寸法、周期磁界集束装置２
を堅く固定するようになつている。 FIG. 1 is a sectional view showing an example of a conventional periodic magnetic field device used in a traveling wave tube. The traveling wave tube 1 includes an electron gun 11 that emits an electron beam, a helix 12 that causes the electron beam to interact with a high frequency, and a collector 13 that captures the electron beam after contributing to high frequency amplification. The device is housed inside a tubular outer circumferential tube 14 forming a part of an envelope via a plurality of support rods 15 made of beryllia porcelain or the like. The periodic magnetic field focusing device 2 includes a plurality of pole pieces 21 installed in advance on the outer periphery of the outer circumferential tube 14.
A plurality of annular permanent magnets 22 (usually two
After the tube is divided into two parts (split), it is mounted so that no gaps are observed between the divided surfaces, and a periodic magnetic field is generated to focus the electron beam on the axis of the traveling wave tube. At both ends of the periodic magnetic field focusing device 2, there are input magnetic shields 1 that form part of the vacuum envelope of the tube made of a magnetic material such as Kovar.
6, and an output section magnetic shield 17 are provided. The input section magnetic shield 16 and the output section magnetic shield 17 are fixed on the outer periphery of the outer circumferential tube 14 by brazing or the like, and the annular permanent magnet 22 and the pole piece of the periodic magnetic field focusing device 2 constituted between them. The periodic magnetic field focusing device 2 is dimensioned and dimensioned in a positional relationship such that the devices 21 and 21 are installed without allowing any gaps between them.
It is designed to be firmly fixed.
しかしながら、製造上のバラツキまたは円環状
永久磁石２２、ポールピース２１の厚さなど個々
の部品の寸法のバラツキによつて、その固定の度
合いは異なり、場合によつてはわずかな機械的衝
撃でも円環状永久磁石２２が、電子ビーム透過率
が最良となるよう調整された位置から動く場合も
生じて、その結果電子ビームと周期磁界集束装置
２との適切な位置関係が得られなくなり、ヘリツ
クス１２に当たる電子の数が漸増して、進行波管
の安定動作に不具合を生ずる危険性があつた。 However, the degree of fixation varies depending on manufacturing variations or variations in the dimensions of individual parts such as the thickness of the annular permanent magnet 22 and the pole piece 21, and in some cases even a slight mechanical shock may cause the The annular permanent magnet 22 may move from the position adjusted to give the best electron beam transmittance, and as a result, an appropriate positional relationship between the electron beam and the periodic magnetic field focusing device 2 cannot be obtained, and the electron beam hits the helix 12. There was a risk that the number of electrons would gradually increase, causing trouble in the stable operation of the traveling wave tube.
またヘリツクス１２に衝突する電子の増加や、
高周波損失によりヘリツクス１２で発生する熱は
通常は支持棒１５を介して外周管１４からポール
ピース２１に伝導され、円環状永久磁石２２も含
めた周期磁界集束装置２を経てその外周に設けら
れた放熱体（図示せず）を介し放散される。この
場合、周期磁界集束装置２を構成するポールピー
ス２１および円環状永久磁石２２の締結が十分で
ないと、ヘリツクス１２から伝導される熱による
熱履歴によつて、部品間の締結が更に緩み電子ビ
ームと集束磁界の適切なバランスが崩れて、ヘリ
ツクス電流の漸増や不安定をまねき進行波管に致
命的な不具合を生ずる恐れもあつた。 In addition, the number of electrons colliding with helix 12 increases,
The heat generated in the helix 12 due to high frequency loss is normally conducted from the outer circumferential tube 14 to the pole piece 21 via the support rod 15, and through the periodic magnetic field focusing device 2 including an annular permanent magnet 22 provided on the outer periphery of the pole piece 21. It is dissipated via a heat sink (not shown). In this case, if the pole piece 21 and the annular permanent magnet 22 constituting the periodic magnetic field focusing device 2 are not sufficiently fastened, the thermal history caused by the heat conducted from the helix 12 will further loosen the fastening between the parts, causing the electron beam to This could disrupt the proper balance between the focusing magnetic field and the helical current, leading to a gradual increase and instability of the helical current, which could lead to fatal problems in the traveling wave tube.
本考案は上記欠点を改善し、電子ビーム透過率
調整を容易に行ない得るとともに、部品の寸法精
度或いは製造上のバラツキに関係なく十分な固定
が可能な周期磁界集束装置を提供するものであ
る。 The present invention improves the above-mentioned drawbacks and provides a periodic magnetic field focusing device that can easily adjust the electron beam transmittance and can be sufficiently fixed regardless of the dimensional accuracy or manufacturing variations of the parts.
以下、第２図に基づいて本考案の実施例を説明
する。 Hereinafter, an embodiment of the present invention will be described based on FIG.
進行波管１は従来形と全く同様に電子銃１１、
ヘリツクス１２、コレクタ１３、支持棒１５、外
周管１４とを含むものである。周期磁界集束装置
２は、予め管球に装着されている複数個のポール
ピース２１の間に、円環状永久磁石２２を軸方向
に複数個に分割（通常は２分割）した後、その割
れ目に隙間が認められないように装着されること
によつて構成され、円環状永久磁石２２は外周を
粘着性アルミテープ如きもので外側に反発しない
ように固定される。予め管球に装着されているポ
ールピース２１のうち少なくとも１個が、第３図
Ａ部詳細断面図の３１に示すように一方の面が外
周部にいくほで肉薄となるようなテーパ状に加工
されており、全ての円環状永久磁石２２が装着さ
れた後、前記テーパ付ポールピース３１のテーパ
面と片面が対応したテーパ状に加工された第４図
に示す如きテーパ付磁性板３２を複数個に分割し
て装着する。テーパ付磁性板３２は他のポールピ
ース２１と同じ材質から作られていることはもち
ろんであり、また軸方向の分割数は任意でよい
が、製造工程での作業性等を考慮すれば２分割が
実用的である。第４図は２分割の場合を示してい
る。このようにして構成された周期磁界集束装置
２の両端部には、外周管１４の外側にろう付など
によつて固定され管球の真空外囲器の一部を形成
する入力部磁気シールド１６、および出力部磁気
シールド１７が配設されている。 The traveling wave tube 1 has an electron gun 11, just like the conventional type.
It includes a helix 12, a collector 13, a support rod 15, and an outer tube 14. The periodic magnetic field focusing device 2 divides an annular permanent magnet 22 into a plurality of pieces in the axial direction (usually divided into two pieces) between a plurality of pole pieces 21 that are attached to a tube in advance, and then inserts the annular permanent magnet 22 into the cracks. The annular permanent magnet 22 is mounted so that no gap is allowed, and the outer periphery of the annular permanent magnet 22 is fixed with adhesive aluminum tape or the like to prevent outward repulsion. At least one of the pole pieces 21 that has been attached to the tube in advance is tapered so that one surface becomes thinner toward the outer periphery, as shown at 31 in the detailed sectional view of part A in FIG. 3. After all the annular permanent magnets 22 are attached, a tapered magnetic plate 32 as shown in FIG. Divide into multiple pieces and attach. The tapered magnetic plate 32 is of course made of the same material as the other pole pieces 21, and the number of axial divisions may be arbitrary, but it may be divided into two in consideration of workability in the manufacturing process. is practical. FIG. 4 shows the case of two divisions. At both ends of the periodic magnetic field focusing device 2 configured in this manner, an input magnetic shield 16 is fixed to the outside of the outer circumferential tube 14 by brazing or the like and forms a part of the vacuum envelope of the tube. , and an output section magnetic shield 17 are provided.
初期においては、円環状永久磁石２２がスムー
ズに回転可能なようにテーパ付磁性板３２は第５
図に示す如く軽く装着固定されている。そして電
子ビームの透過率が最良となるよう、円環状永久
磁石２２は回転或いは外周管１４との寸法公差範
囲内で上下、左右に動かされて最適な位置が決め
られる。このようにして、周期磁界集束装置２を
構成する円環状永久磁石２２がそれぞれ電子ビー
ム透過率が最良となる位置に調整された後、テー
パ付磁性板３２を管軸に垂直な方向に強く挿入固
定すると、くさび作用によつて、第５図に示す矢
印の方向に円環状永久磁石２２が押され、周期磁
界集束装置２は、その両端部が入力部磁気シール
ド１６、および出力部磁気シールド１７によつて
固定されているので、軸方向に堅く締めつけられ
る。かくして締めつけ固定された周期磁界集束装
置２は後工程で発生する振動や衝撃にも動くこと
なく、さらに、ヘリツクス部からの発熱による熱
履歴によつても容易に緩むことなく常に電子ビー
ムとの適切な位置関係を保持できしたがつて安定
した進行波管の動作を得ることが出来る。 Initially, the tapered magnetic plate 32 is placed in the fifth position so that the annular permanent magnet 22 can rotate smoothly.
As shown in the figure, it is lightly attached and fixed. The annular permanent magnet 22 is then rotated or moved vertically and horizontally within the dimensional tolerance range with respect to the outer circumferential tube 14 to determine the optimum position so that the transmittance of the electron beam is maximized. In this way, after each of the annular permanent magnets 22 constituting the periodic magnetic field focusing device 2 is adjusted to the position where the electron beam transmittance is the best, the tapered magnetic plate 32 is strongly inserted in the direction perpendicular to the tube axis. When fixed, the annular permanent magnet 22 is pushed by the wedge action in the direction of the arrow shown in FIG. Since it is fixed by , it can be tightened firmly in the axial direction. The periodic magnetic field focusing device 2, which is thus tightened and fixed, does not move even when subjected to vibrations or shocks generated in the subsequent process, and also does not easily loosen due to thermal history due to heat generation from the helix, so that it is always properly aligned with the electron beam. Since the positional relationship can be maintained, stable operation of the traveling wave tube can be obtained.
尚、本実施例では第３図の３１に示すようにポ
ールピースの１方の面のみをテーパ状に加工した
場合を示したが、第６図に示す如く、両方の面を
テーパ状にする場合も本考案に含まれることはも
ちろんである。 In this example, only one surface of the pole piece is processed into a tapered shape as shown in 31 in FIG. 3, but both surfaces can be processed into a tapered shape as shown in FIG. 6. Of course, such cases are also included in the present invention.
第１図は従来の周期磁界装置を進行波管に用い
た場合の縦断面図、第２図は本考案による周期磁
界集束装置を進行波管に用いた場合の縦断面図、
第３図は第２図のＡ部詳細縦断面図、第４図はテ
ーパ付磁性板の概略図、第５図はテーパ付磁性板
３２を装着する場合の詳細縦断面図、第６図は本
考案の別の実施例を示す詳細縦断面図である。
１……進行波管、２……周期磁界集束装置、１
１……電子銃、２１……ポールピース、１２……
ヘリツクス、１３……コレクタ、１４……外周
管、１５……支持棒、１６……入力部磁気シール
ド、１７……出力部磁気シールド、２２……円環
状永久磁石、３１……テーパ付ポールピース、３
２……テーパ付磁性板。
FIG. 1 is a vertical cross-sectional view when a conventional periodic magnetic field device is used in a traveling wave tube, and FIG. 2 is a vertical cross-sectional view when a periodic magnetic field focusing device according to the present invention is used in a traveling wave tube.
Fig. 3 is a detailed longitudinal cross-sectional view of part A in Fig. 2, Fig. 4 is a schematic diagram of the tapered magnetic plate, Fig. 5 is a detailed longitudinal cross-sectional view when the tapered magnetic plate 32 is installed, and Fig. 6 is a detailed longitudinal cross-sectional view of section A in Fig. 2. FIG. 6 is a detailed longitudinal cross-sectional view of another embodiment of the present invention; 1... Traveling wave tube, 2... Periodic magnetic field focusing device, 1
1... Electron gun, 21... Pole piece, 12...
Helix, 13...Collector, 14...Outer tube, 15...Support rod, 16...Input section magnetic shield, 17...Output section magnetic shield, 22...Annular permanent magnet, 31...Tapered pole piece ,3
2...Tapered magnetic plate.
Claims (1)
環状永久磁石およびポールピースを交互に同軸的
に配置して成る周期磁界装置において、前記ポー
ルピースのうちの少なくとも１個が、その片面或
いは両面に中心軸から外周方向へ厚さが薄くなる
ようなテーパ形状を有しており、該テーパ付ポー
ルピースと同材質で接触する面が対応したテーパ
形をなすテーパ付磁性板を複数個に分割し前記テ
ーパ付ポールピースに接合するようにして配置し
たことを特徴とする周期磁界集束装置。 In a periodic magnetic field device in which a plurality of annular permanent magnets and pole pieces are arranged coaxially and alternately around the outer periphery of a high-frequency circuit of an electron beam tube, at least one of the pole pieces is arranged on one or both sides thereof. The tapered magnetic plate has a tapered shape in which the thickness decreases from the central axis toward the outer circumference, and is made of the same material as the tapered pole piece and has a corresponding tapered magnetic plate with a corresponding surface that comes in contact with the tapered pole piece. A periodic magnetic field focusing device, characterized in that it is arranged so as to be joined to the tapered pole piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1275382U JPS58115064U (en) | 1982-02-01 | 1982-02-01 | Periodic magnetic field focusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1275382U JPS58115064U (en) | 1982-02-01 | 1982-02-01 | Periodic magnetic field focusing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58115064U JPS58115064U (en) | 1983-08-05 |
| JPS639983Y2 true JPS639983Y2 (en) | 1988-03-24 |
Family
ID=30025305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1275382U Granted JPS58115064U (en) | 1982-02-01 | 1982-02-01 | Periodic magnetic field focusing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58115064U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6085051U (en) * | 1983-11-17 | 1985-06-12 | 日本電気株式会社 | traveling wave tube |
| JPH0414840Y2 (en) * | 1987-02-17 | 1992-04-03 |
-
1982
- 1982-02-01 JP JP1275382U patent/JPS58115064U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58115064U (en) | 1983-08-05 |
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