JPH034500A - Wiggler for electron beam - Google Patents
Wiggler for electron beamInfo
- Publication number
- JPH034500A JPH034500A JP13854189A JP13854189A JPH034500A JP H034500 A JPH034500 A JP H034500A JP 13854189 A JP13854189 A JP 13854189A JP 13854189 A JP13854189 A JP 13854189A JP H034500 A JPH034500 A JP H034500A
- Authority
- JP
- Japan
- Prior art keywords
- electron beam
- magnetic pole
- magnetic
- pole
- poles
- 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.)
- Pending
Links
- 238000010894 electron beam technology Methods 0.000 title claims abstract description 41
- 230000005291 magnetic effect Effects 0.000 claims abstract description 88
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000000737 periodic effect Effects 0.000 abstract description 8
- 230000005415 magnetization Effects 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 abstract 2
- 230000005469 synchrotron radiation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Particle Accelerators (AREA)
Abstract
Description
この発明は、シンクロトロンやライナック装置内の電子
ビームを蛇行させて放射光を発生させる電子ビーム用ウ
ィグラに関する。The present invention relates to an electron beam wiggler that generates synchrotron radiation by meandering an electron beam in a synchrotron or linac device.
シンクロトロン等のダクト内を周回する電子ビームに対
し偏向電磁石の発生磁場でもって偏向させたとき、ある
いはウィグラで発生させた周期的に変化する磁場により
、電子ビームを蛇行させたとき、電子ビームよりビーム
軌道接線方向に、赤外線からＸ線の領域にわたる放射光
が放出される。
この放射光は、極めて強力でかつ指向性が良〈産業用途
での利用価値が高いことからシンクロトロン放射光発生
装置として用いられる。
前記ウィグラとしては、例えば、
Ｐｒｏｃｅｅｄｉｇｓ ｏｒ ７ｔｈ Ｉｎｔｅｒｎａ
ｔｉｏｎａｌ Ｃｏｎｒｅｒｅｎｃｅｏｎ Ｆｒｅｅ
Ｅｌｅｃｔｒｏｎ Ｌａ５ｅｒｓ （Ｓｅｐ、８−１３
１９８５）に述べられており、第５図及び第６図にその
該略構成を示す。
第５図において、電子ビーム軌道Ｑを挟むように軌道Ｑ
の上下にそれぞれ、Ｓ極の磁石５１とＮ極の磁石５２と
を交互にかつ磁石間にサマリウム・コバルト系の強磁性
体５３を介在させて配列し、上下でそれぞれ対向する磁
石を互いに反対の磁極となるように構成することにより
、電子ビーム軌道Ｑに対して周期磁場を発生させ、この
周期磁場でもって電子ビームを蛇行させている。
第６図は、磁石の代わりに電磁石を用いたものであり、
首記強磁性体５３を挟んでフェロマグネチックによる磁
極６１を配列し、そしてこれらの磁極６１に対してコイ
ル６２を装荷し、隣接する磁極の交互の極性となり、か
つ、上下で相対向する磁極で反対の極性となるよう、前
記コイル６２に通電する。When an electron beam orbiting in a duct such as a synchrotron is deflected by the magnetic field generated by a deflecting electromagnet, or when the electron beam is caused to meander by a periodically changing magnetic field generated by a wiggler, In a direction tangential to the beam trajectory, radiation is emitted ranging from the infrared to the X-ray range. This synchrotron radiation is extremely powerful and has good directivity (and has high utility value in industrial applications), so it is used as a synchrotron radiation generator. As the wiggler, for example, Proceedigs or 7th International
tional Conrerenceon Free
Electron La5ers (Sep, 8-13
1985), and its schematic structure is shown in FIGS. 5 and 6. In Fig. 5, the orbit Q is placed on both sides of the electron beam orbit Q.
S-pole magnets 51 and N-pole magnets 52 are arranged alternately on the upper and lower sides of the By configuring it to be a magnetic pole, a periodic magnetic field is generated with respect to the electron beam trajectory Q, and the electron beam is meandered by this periodic magnetic field. Figure 6 shows an example in which an electromagnet is used instead of a magnet.
Ferromagnetic magnetic poles 61 are arranged with the ferromagnetic material 53 in between, and coils 62 are loaded onto these magnetic poles 61, so that the adjacent magnetic poles have alternate polarity and the upper and lower opposite magnetic poles. The coil 62 is energized so that it has the opposite polarity.
ところで、電子ビーム用ウィグラにおいては、発生させ
る周期磁場における磁場強度のバラツキ（第７図に示す
ΔＢ）を０．３％以下にする必要がある。ところが上述
した従来のウィグラでは、各磁極片が独立しているため
、磁石あるいは電磁石の磁化特性のバラツキ等が原因で
前述の磁場特性を得るのが困難であった。
この発明は、上述した問題点をなくすためになされたも
のであり、バラツキを低減した周期磁場を発生でき電子
ビーム用ウィグラを提供することを目的とする。Incidentally, in the wiggler for electron beams, it is necessary to reduce the variation in magnetic field strength (ΔB shown in FIG. 7) in the periodic magnetic field to be generated to 0.3% or less. However, in the above-mentioned conventional wiggler, each magnetic pole piece is independent, so it is difficult to obtain the above-mentioned magnetic field characteristics due to variations in the magnetization characteristics of the magnets or electromagnets. The present invention has been made to eliminate the above-mentioned problems, and an object of the present invention is to provide a wiggler for electron beams that can generate a periodic magnetic field with reduced variation.
この発明の電子ビーム用ウィグラは、電子ビーム軌道を
挟むようにして位置する起磁力要素及び磁極配置要素か
らなる電子ビーム用ウィグラであって、
起磁力要素は、電子ビームの軌道方向の左右で該電子ビ
ーム軌道方向に所定長延在する、Ｎ極及びＳ極の磁極を
有し、
一方、磁極配置要素においては、前記Ｎ極の磁極により
Ｓ極に磁化される突起状磁極と、前記Ｓ極の磁極により
Ｎ極に磁化される突起状磁極とを所定のピッチでもって
交互に設けたことを特徴とする。The wiggler for an electron beam of the present invention is an electron beam wiggler comprising a magnetomotive force element and a magnetic pole arrangement element positioned to sandwich the electron beam trajectory, and the magnetomotive force element is arranged on the left and right sides of the electron beam trajectory. It has N-pole and S-pole magnetic poles extending a predetermined length in the orbital direction, and on the other hand, the magnetic pole arrangement element includes a protruding magnetic pole that is magnetized to the S-pole by the N-pole, and a protruding magnetic pole that is magnetized to the S-pole by the N-pole; It is characterized in that protruding magnetic poles magnetized to N poles are alternately provided at a predetermined pitch.
上記構成によれば、起磁力要素における磁極によってＳ
極及びＮ極に磁化される突起状磁極を交互に配したこと
により、起磁力要素及び磁極配置要素の対向する両磁極
によって、交互に磁化方向が反転する磁場が形成される
が、起磁力要素における磁極は一様に磁化され、この磁
極によって磁化される、磁極配置要素側の磁極もそれ故
、−様に磁化されるので、発生磁場はバラツキなく周期
的に変化する。According to the above configuration, the magnetic pole in the magnetomotive force element causes S
By alternately arranging protruding magnetic poles that are magnetized as poles and north poles, a magnetic field in which the direction of magnetization is alternately reversed is formed by the opposing magnetic poles of the magnetomotive force element and the magnetic pole arrangement element, but the magnetomotive force element The magnetic poles on the magnetic poles are uniformly magnetized, and the magnetic poles on the magnetic pole arrangement element side that are magnetized by these magnetic poles are therefore also magnetized in a −-like manner, so that the generated magnetic field changes periodically without variation.
以下、この発明の電子ビーム用ウィグラの一実施例を図
面に従い説明する。
第１図は分解斜視図を示し、第２図及び第３図に、正面
図及び側面図を示している。
ｌは、起磁力要素としての電磁石であり、断面がコの字
形状をなし、電子ビーム軌道Ｑ方向に延在する所定長の
鉄心２及び、この鉄心２の溝２ａに巻回されたコイル３
（第２図及び第３図図示）とからなり、このコイル３に
通電することにより、鉄心２の真実山部は、磁極２ａ、
２ｂとしてそれぞれＮ極及びＳ極に磁化される。
４は、磁極配置要素としての磁極配置部であり、電磁石
ｌと同じ幅Ｗを有する平板状の鉄心５上に、前記電磁石
１の各磁極２ｂ、２ｃと対向するように、それぞれ間隔
りを隔てて複数の突起状磁極６．７が形成されるととも
に、第２図に示しｔこように、一方の磁極は、他方の磁
極よりそれぞれＬ／２づつずれて設けられており、側方
から見た場合、突起状磁極６と７とはし／２のピッチで
並んでいる。
このピッチは、電子ビームが蛇行する際のピッチと一致
するように、前記各突起状磁極６．７が配される。これ
らの電磁石ｌと磁極配置部４とは、第３図に示すように
、電子ビーム軌道Ｑを上下から挟むようにして対向して
おり、電磁石ｌの磁極２ｂ、２ｃの端面と磁極配置部４
の突起状磁極６，７の端面とは、所定の間隔Ｇで隔てら
れる。尚、第２図中の８．９は、電磁石！及び磁極配置
部４で構成されるウィグラ１０に対する偏向電磁石であ
第４図は、上記ウィグラ１０の平面図を示しており、こ
の第４図を用いて上記構成のウィグラＩＯの動作を説明
する。
電磁石１のコイル２に直流を流し、磁極２ ｂ、 ２
ｃをそれぞれＮ極とＳ極とに磁化すると、これらの磁極
２ｂ、２ｃに対向する突起状磁極６と７とは、それぞれ
Ｓ極とＮ極とに一定の強度に磁化され、第２図に示した
ように、電子ビーム軌道ＱにおいてＮ極からＳ極に向か
う磁力線（矢印で示す）が交互に生じるので、バラツキ
の少ない周期磁場が得られる。
この状態で、真空ダクト（不図示）内を中心軌道に沿っ
て進行する電子ビームは、偏向電磁石８によって偏向さ
れ、ウィグラＩＯの人口側の一番目のＳ極の突起状磁極
６に向かう。この突起状磁極６においては、この突起状
磁極６に生じている上下方向の磁場によって電子ビーム
の軌道は、進行方向よりほぼ９０°左方向（図中では斜
め上方向）に偏向されるが、電子ビームの蛇行ピッチと
一致して他方の突起状磁極７が設けられているので、電
子ビームはＮ極の突起状磁極７に向かう。この突起状磁
極７では前記突起状磁極６と逆向きの磁場が生じ−てい
るので、電子ビーム軌道Ｑは、はぼ９０°右方向（図中
斜め下方向）に向かう。このように、突起状磁極６．７
での一定強度の磁場によって電子ビームは、偏向され、
この偏向時に放射光が放射される。このようにウィグラ
ＩＯ内を蛇行した電子ビームは、偏向電磁石９によって
真空ダクトの中心軌道に偏向される。An embodiment of the electron beam wiggler of the present invention will be described below with reference to the drawings. FIG. 1 shows an exploded perspective view, and FIGS. 2 and 3 show a front view and a side view. 1 is an electromagnet as a magnetomotive force element, which has a U-shaped cross section and has an iron core 2 of a predetermined length extending in the direction of the electron beam trajectory Q, and a coil 3 wound around a groove 2a of this iron core 2.
(shown in FIGS. 2 and 3), and by energizing this coil 3, the true peak portion of the iron core 2 becomes the magnetic pole 2a,
2b, which are respectively magnetized to N and S poles. Reference numeral 4 denotes a magnetic pole arrangement part as a magnetic pole arrangement element, which is arranged at intervals on a flat iron core 5 having the same width W as the electromagnet 1 so as to face each of the magnetic poles 2b and 2c of the electromagnet 1. A plurality of protruding magnetic poles 6.7 are formed, and as shown in FIG. In this case, the protruding magnetic poles 6 and 7 are arranged at a pitch of 1/2. The protruding magnetic poles 6.7 are arranged so that this pitch matches the pitch at which the electron beam meanders. As shown in FIG. 3, these electromagnets 1 and the magnetic pole arrangement section 4 are opposed to each other so as to sandwich the electron beam trajectory Q from above and below.
are separated from the end surfaces of the protruding magnetic poles 6 and 7 by a predetermined distance G. In addition, 8.9 in Figure 2 is an electromagnet! FIG. 4 shows a plan view of the wiggler 10, and the operation of the wiggler IO having the above structure will be explained using FIG. 4. Direct current is applied to the coil 2 of the electromagnet 1, and the magnetic poles 2 b, 2
When c is magnetized to N pole and S pole, respectively, the protruding magnetic poles 6 and 7 facing these magnetic poles 2b and 2c are magnetized to a certain strength as S pole and N pole, respectively, as shown in FIG. As shown, lines of magnetic force (indicated by arrows) from the north pole to the south pole occur alternately in the electron beam trajectory Q, so that a periodic magnetic field with little variation can be obtained. In this state, the electron beam traveling along the central orbit within the vacuum duct (not shown) is deflected by the deflection electromagnet 8 and heads toward the protruding magnetic pole 6 of the first S pole on the population side of the wiggler IO. In this protruding magnetic pole 6, the trajectory of the electron beam is deflected approximately 90° to the left of the traveling direction (diagonally upward in the figure) due to the vertical magnetic field generated in the protruding magnetic pole 6. Since the other protruding magnetic pole 7 is provided to match the meandering pitch of the electron beam, the electron beam heads toward the N-pole protruding magnetic pole 7. Since a magnetic field is generated in this protruding magnetic pole 7 in the opposite direction to that of the protruding magnetic pole 6, the electron beam trajectory Q is directed approximately 90 degrees to the right (diagonally downward in the figure). In this way, the protruding magnetic pole 6.7
The electron beam is deflected by a magnetic field of constant strength at
During this deflection, synchrotron radiation is emitted. The electron beam that meandered inside the wiggler IO in this way is deflected to the center orbit of the vacuum duct by the deflection electromagnet 9.
以上説明したように、この発明は、起磁力要素における
磁極によってＳ極及びＮ極に磁化される突起状磁極を交
互に配したことにより、起磁力要。
素の磁極と磁極配置要素の磁極との間にバラツキのない
周期磁場が得られる。As explained above, the present invention reduces the magnetomotive force by alternately arranging protruding magnetic poles that are magnetized to S and N poles by the magnetic poles in the magnetomotive force element. A periodic magnetic field without variation can be obtained between the bare magnetic pole and the magnetic pole of the magnetic pole arrangement element.
第１図はこの発明の電子ビーム用ウィグラの一実施例を
示す斜視図、第２図及び第３図は、第１図図示の電子ビ
ーム用ウィグラの正面図及び側面図、第４図は、電子ビ
ームの進行経路を示す平面図、第５図及び第６図は、従
来の電子ビーム用ウィグラの構成を示す断面図、第７図
は、第５図及び第６図の電子ビーム用ウィグラで得られ
る周期磁場を示す図である。
■・・・電磁石、２・・・鉄心、
２ａ、２ｂ・・磁極、３・・・コイル、４・・磁極配置
部、５・鉄心、
６．７・・・突起途上磁極。
１１１図
１【虜ｈ
（FIG. 1 is a perspective view showing an embodiment of the electron beam wiggler of the present invention, FIGS. 2 and 3 are front and side views of the electron beam wiggler shown in FIG. 1, and FIG. 5 and 6 are cross-sectional views showing the configuration of a conventional electron beam wiggler, and FIG. 7 is a plan view showing the electron beam traveling path, and FIG. 7 is a cross-sectional view showing the configuration of a conventional electron beam wiggler. It is a figure showing the periodic magnetic field obtained. ■...Electromagnet, 2...Iron core, 2a, 2b...Magnetic poles, 3...Coil, 4...Magnetic pole placement part, 5...Iron core, 6.7...Protruding magnetic pole. 111Figure 1 [Captive h (
Claims (3)
要素及び磁極配置要素からなる電子ビーム用ウィグラで
あって、 起磁力要素は、電子ビームの軌道方向の左右で該電子ビ
ーム軌道方向に所定長延在する、Ｎ極及びＳ極の磁極を
有し、 一方、磁極配置要素においては、前記Ｎ極の磁極により
Ｓ極に磁化される突起状磁極と、前記Ｓ極の磁極により
Ｎ極に磁化される突起状磁極とを所定のピッチでもって
交互に設けたことを特徴とする電子ビーム用ウィグラ。(1) An electron beam wiggler consisting of a magnetomotive force element and a magnetic pole arrangement element positioned so as to sandwich the electron beam trajectory, the magnetomotive force element extending a predetermined length in the electron beam trajectory direction on the left and right sides of the electron beam trajectory direction. The magnetic pole arrangement element has a protruding magnetic pole that is magnetized to the S pole by the N pole, and a protruding magnetic pole that is magnetized to the N pole by the S pole. A wiggler for an electron beam characterized in that protruding magnetic poles are alternately provided at a predetermined pitch.
を、電子ビームの蛇行ピッチと一致させた請求項１記載
の電子ビーム用ウィグラ。(2) The wiggler for an electron beam according to claim 1, wherein the pitch of the N-pole side protruding magnetic pole and the S-pole side protruding magnetic pole is made to match the meandering pitch of the electron beam.
よりなる請求項１あるいは２に記載の電子ビーム用ウィ
グラ。(3) The wiggler for an electron beam according to claim 1 or 2, wherein the magnetomotive force element comprises an iron core and a coil wound around the iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13854189A JPH034500A (en) | 1989-05-31 | 1989-05-31 | Wiggler for electron beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13854189A JPH034500A (en) | 1989-05-31 | 1989-05-31 | Wiggler for electron beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH034500A true JPH034500A (en) | 1991-01-10 |
Family
ID=15224566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13854189A Pending JPH034500A (en) | 1989-05-31 | 1989-05-31 | Wiggler for electron beam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH034500A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4956789A (en) * | 1987-05-13 | 1990-09-11 | Hitachi, Ltd. | Method and apparatus for driving a servo system while suppressing residual vibration generated during position control |
| JPH0547494A (en) * | 1991-08-12 | 1993-02-26 | Sumitomo Electric Ind Ltd | Multipolar wiggler |
-
1989
- 1989-05-31 JP JP13854189A patent/JPH034500A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4956789A (en) * | 1987-05-13 | 1990-09-11 | Hitachi, Ltd. | Method and apparatus for driving a servo system while suppressing residual vibration generated during position control |
| JPH0547494A (en) * | 1991-08-12 | 1993-02-26 | Sumitomo Electric Ind Ltd | Multipolar wiggler |
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