JPH07135100A - Method of fine adjustment of magnetic field intensity for periodic magnetic field generating device - Google Patents
Method of fine adjustment of magnetic field intensity for periodic magnetic field generating deviceInfo
- Publication number
- JPH07135100A JPH07135100A JP27820193A JP27820193A JPH07135100A JP H07135100 A JPH07135100 A JP H07135100A JP 27820193 A JP27820193 A JP 27820193A JP 27820193 A JP27820193 A JP 27820193A JP H07135100 A JPH07135100 A JP H07135100A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- fine adjustment
- magnetic
- magnet
- wiggler
- 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.)
- Withdrawn
Links
Landscapes
- Particle Accelerators (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、周期磁場発生装置に用
いて好適な磁場強度微調整方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field intensity fine adjustment method suitable for use in a periodic magnetic field generator.
【０００２】[0002]
【従来の技術】従来から、周期的に磁場を発生させる装
置として、ウィグラと称する周期磁場発生装置が知られ
ている。このウィグラは、例えば図１に示すように永久
磁石１と磁性体片（ポールピース）２とを交互に連設し
た構造を有し、ＦＥＬ（Free Electron Laser:自由電子
レーザ）などの放射光源を得るための重要な要素となっ
ている。2. Description of the Related Art Conventionally, a periodic magnetic field generator called a wiggler has been known as a device for periodically generating a magnetic field. This wiggler has, for example, a structure in which permanent magnets 1 and magnetic pieces (pole pieces) 2 are alternately arranged as shown in FIG. 1, and a radiation source such as an FEL (Free Electron Laser) is used. It has become an important factor to gain.
【０００３】このようなウィグラにおいては、非常に高
精度な磁場が要求されるが、一般的に永久磁石は、制作
工程上、磁石個々の特性にばらつきが生じるため、磁場
の微調整が必要となる。In such a wiggler, an extremely high precision magnetic field is required, but in general, a permanent magnet requires fine adjustment of the magnetic field because the characteristics of each magnet vary in the manufacturing process. Become.
【０００４】従来の磁場強度微調整方法には、図５に示
すように永久磁石１の磁極面上に強磁性体片（シム）５
を貼付けるシム法、図６に示すようにポールピース２の
位置を移動させる磁極変位法があった。また、磁場強度
微調整方法では、永久磁石１の位置を移動させる場合も
ある。In the conventional method of finely adjusting the magnetic field strength, as shown in FIG. 5, a ferromagnetic material piece (shim) 5 is formed on the magnetic pole surface of the permanent magnet 1.
There was a shim method for sticking the magnetic pole and a magnetic pole displacement method for moving the position of the pole piece 2 as shown in FIG. Further, in the magnetic field strength fine adjustment method, the position of the permanent magnet 1 may be moved.
【０００５】[0005]
【発明が解決しようとする課題】上記した従来の磁場強
度微調整方法では、以下に示す欠点があった。シム法で
は、狭いギャップ内でのウィグラの内側にシムを正確に
貼付けるのは難しく、調整作業の工程に多くの時間を要
するので、コストがかかってしまうという欠点があっ
た。The above-mentioned conventional magnetic field intensity fine adjustment method has the following drawbacks. In the shim method, it is difficult to accurately attach the shim to the inside of the wiggler in a narrow gap, and a lot of time is required for the adjustment work process, which is disadvantageous in that the cost is high.
【０００６】一方、磁極変位法では、個々のポールピー
スの位置を変化させるため、装置が大きくなり、また、
磁石と磁性体（ポールピース）との間の電磁力もある
上、数１０μｍ程度の位置調整を必要とする。このた
め、操作が難しく、調整作業の工程に多くの時間を要す
るので、コストがかかってしまうという欠点があった。On the other hand, in the magnetic pole displacement method, since the position of each pole piece is changed, the device becomes large, and
In addition to the electromagnetic force between the magnet and the magnetic body (pole piece), it is necessary to adjust the position by several tens of μm. For this reason, the operation is difficult, and the adjustment process requires a lot of time, resulting in high cost.
【０００７】本発明は、上記事情を考慮してなされたも
のであり、その目的は、磁場強度の調整作業の工程を削
減して低コスト化および装置の小型化を計れる周期磁場
発生装置の磁場強度微調整方法を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to reduce the cost of the magnetic field strength adjusting process and to reduce the size of the device by reducing the magnetic field of the periodic magnetic field generating device. It is to provide a method of finely adjusting the strength.
【０００８】[0008]
【課題を解決するための手段】本発明は、磁場の微調整
が必要な永久磁石の背面側に、当該磁石を挟むようにコ
の字型形状の強磁性体片を取り付けることにより磁場を
調整することを特徴とする。According to the present invention, a magnetic field is adjusted by attaching a U-shaped ferromagnetic piece on the back side of a permanent magnet which requires fine adjustment of the magnetic field so as to sandwich the magnet. It is characterized by doing.
【０００９】[0009]
【作用】通常のハイブリッド型ウィグラでは、永久磁石
より発生する磁力線の多くは、当該磁石に隣接する磁性
体（ポールピース）側へ曲げられる。そこで、上記した
ように、磁場の微調整が必要な永久磁石の背面側に、当
該磁石を挟むようにコの字型形状の強磁性体片を取り付
けると、当該永久磁石より発生する磁力線を当該永久磁
石の背面側に逃がす磁束のバイパスが形成されるので、
磁力線の一部は、このバイパスを通ってウィグラ（周期
磁場発生装置）の外面側に逃げる。したがって、ウィグ
ラの磁極表面での磁束密度を均一にすることができる。In the normal hybrid wiggler, most of the magnetic lines of force generated by the permanent magnet are bent toward the magnetic body (pole piece) adjacent to the magnet. Therefore, as described above, when a U-shaped ferromagnetic piece is sandwiched so as to sandwich the magnet on the back side of the permanent magnet requiring fine adjustment of the magnetic field, the magnetic field lines generated from the permanent magnet are concerned. Since a bypass for the escaped magnetic flux is formed on the back side of the permanent magnet,
Part of the magnetic field lines escapes to the outer surface side of the wiggler (periodic magnetic field generator) through this bypass. Therefore, the magnetic flux density on the magnetic pole surface of the wiggler can be made uniform.
【００１０】[0010]
【実施例】以下、図面を参照して本発明の一実施例を説
明する。図１は本発明の一実施例に係る磁場強度微調整
方法の適用対象となる周期磁場発生装置（ハイブリッド
型ウィグラ）の構造図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a structural diagram of a periodic magnetic field generator (hybrid wiggler) to which a magnetic field intensity fine adjustment method according to an embodiment of the present invention is applied.
【００１１】図１に示すように、周期磁場発生装置は、
互いの磁極表面が対向する１対の磁石列から構成されて
いる。各磁石列においては、矢印Ａで示される磁場の向
きが列方向に交互に逆向きになるようにして、永久磁石
１が複数並べられている。さらに、隣合う永久磁石１の
間に、それぞれその高さが永久磁石１よりも低いポール
ピース（磁性体）２が挿入されている。As shown in FIG. 1, the periodic magnetic field generator is
It is composed of a pair of magnet rows whose magnetic pole surfaces face each other. In each magnet row, a plurality of permanent magnets 1 are arranged so that the directions of the magnetic fields indicated by arrows A are alternately opposite to the row direction. Further, pole pieces (magnetic bodies) 2 each having a height lower than that of the permanent magnet 1 are inserted between adjacent permanent magnets 1.
【００１２】このような構造のハイブリッド型ウィグラ
においては、通常図３（ａ）に示すように、永久磁石１
により発生した磁力線４の多くは、同磁石１の両脇に配
設された１対のポールピース２側に曲げられている。In a hybrid type wiggler having such a structure, as shown in FIG.
Most of the magnetic force lines 4 generated by the above are bent toward the pair of pole pieces 2 arranged on both sides of the magnet 1.
【００１３】つぎに、上記した構造のハイブリッド型ウ
ィグラに、本実施例に係る磁場強度微調整方法を適用し
た場合の詳細を図を用いて説明する。図２は、同磁場強
度微調整方法により磁場強度の調整がなされたハイブリ
ッド型ウィグラの磁石列方向の断面図である。Next, details of the case where the magnetic field intensity fine adjustment method according to the present embodiment is applied to the hybrid type wiggler having the above structure will be described with reference to the drawings. FIG. 2 is a cross-sectional view in the magnet array direction of the hybrid wiggler whose magnetic field strength is adjusted by the magnetic field strength fine adjustment method.
【００１４】ウィグラを構成する複数の永久磁石１の中
で磁場強度の微調整を必要とする永久磁石１の背面、す
なわち磁極表面の反対側の面には、図２に示すように、
コの字型形状の強磁性体片（以下、背面シムと称す）３
が、当該磁石１の先端部両側面を挟むように、矢印Ａで
示される磁場の向きに沿って貼り付けられている。As shown in FIG. 2, on the back surface of the permanent magnet 1 which requires fine adjustment of the magnetic field strength among the plurality of permanent magnets 1 forming the wiggler, that is, on the surface opposite to the magnetic pole surface,
U-shaped ferromagnetic piece (hereinafter referred to as back shim) 3
Are attached along the direction of the magnetic field indicated by the arrow A so as to sandwich both side surfaces of the tip portion of the magnet 1.
【００１５】さて、このようにシム３を永久磁石１の背
面に設けると、磁力線４を当該磁石１の背面に逃がす磁
束のバイパスが形成される。この結果、図３（ｂ）に示
すように、磁力線４の一部がウィグラの外側へ逃げるよ
うになる。By providing the shim 3 on the back surface of the permanent magnet 1 in this manner, a magnetic flux bypass is formed to allow the magnetic field lines 4 to escape to the back surface of the magnet 1. As a result, as shown in FIG. 3B, a part of the magnetic force lines 4 escape to the outside of the wiggler.
【００１６】このように、磁力線４の一部をウィグラの
外側へ逃がすことにより、磁場強度の調整が行える。更
に、背面シム３の厚みｔおよび高さｈを適宜変えること
により、図４に示すように磁場強度を調整することも可
能である。この図４は、ハイブリッド型ウィグラに背面
シム３を適用したときの磁場解析の結果を示したもので
ある。In this way, the magnetic field strength can be adjusted by letting a part of the magnetic force lines 4 escape to the outside of the wiggler. Further, the magnetic field strength can be adjusted as shown in FIG. 4 by appropriately changing the thickness t and the height h of the back surface shim 3. FIG. 4 shows the result of magnetic field analysis when the back surface shim 3 is applied to the hybrid wiggler.
【００１７】図４では、ウィグラに例えば厚みｔ＝１ｍ
ｍ，高さｈ＝６ｍｍの背面シム３を適用した場合には、
シム無しのときは０．４７６（Ｔ）であるウィグラのピ
ーク磁場値を０．４４２（Ｔ）に減少させることができ
ることを表している。なお、ここでは磁場の強度を表す
単位としてテスラ：Ｔを用いている。In FIG. 4, the wiggler has a thickness t = 1 m, for example.
When the back shim 3 with m and height h = 6 mm is applied,
It means that the peak magnetic field value of the wiggler, which is 0.476 (T) without the shim, can be reduced to 0.442 (T). Here, Tesla: T is used as a unit for expressing the strength of the magnetic field.
【００１８】[0018]
【発明の効果】本発明によれば、磁場強度の調整を必要
とする永久磁石の背面の背面側にコの字型形状の強磁性
体を当該磁石を挟むように取り付けるという極簡単なこ
とにより、当該永久磁石から発生する磁力線を当該永久
磁石の背面、すなわち周期磁場発生装置の外面に逃がす
磁束のバイパスを形成しているので、磁極面での磁場を
微小な範囲で変化（減少）させることができる。よっ
て、容易に磁場強度を調整することができる。According to the present invention, the U-shaped ferromagnetic material is attached to the back side of the back surface of the permanent magnet requiring adjustment of the magnetic field strength so as to sandwich the magnet. The magnetic field at the magnetic pole surface is changed (decreased) in a minute range because a bypass of the magnetic flux that escapes the magnetic field lines generated from the permanent magnet to the back surface of the permanent magnet, that is, the outer surface of the periodic magnetic field generator is formed. You can Therefore, the magnetic field strength can be easily adjusted.
【００１９】つまり、本発明によれば、操作が容易とな
るため、作業工程を削減することができ、低コスト化が
計れる。また、大掛かりな装置も不要なので、周期磁場
発生装置全体の装置としての小型化も計れる。That is, according to the present invention, since the operation is facilitated, it is possible to reduce the work steps and reduce the cost. Further, since a large-scale device is not necessary, the size of the entire periodic magnetic field generation device can be reduced.
【図１】本発明の一実施例に係る磁場強度微調整方法の
適用対象となるハイブリッド型ウィグラの構造図。FIG. 1 is a structural diagram of a hybrid wiggler to which a magnetic field intensity fine adjustment method according to an embodiment of the present invention is applied.
【図２】同実施例に係る磁場強度微調整方法を適用した
場合のハイブリッド型ウィグラの磁石列方向の断面図。FIG. 2 is a cross-sectional view of the hybrid wiggler in the magnet array direction when the magnetic field strength fine adjustment method according to the embodiment is applied.
【図３】通常のハイブリッド型ウィグラにおける磁力線
分布の状態と同実施例に係る磁場強度微調整方法を適用
した場合のハイブリッド型ウィグラにおける磁力線分布
の状態とを比較して示す図。FIG. 3 is a view showing a state of distribution of magnetic force lines in a normal hybrid wiggler and a state of distribution of magnetic force lines in a hybrid wiggler when the magnetic field intensity fine adjustment method according to the embodiment is applied.
【図４】同実施例に係る磁場強度微調整方法を適用した
場合のハイブリッド型ウィグラの磁場解析結果を示す
図。FIG. 4 is a diagram showing a magnetic field analysis result of the hybrid wiggler when the magnetic field strength fine adjustment method according to the example is applied.
【図５】従来の磁場強度微調整方法であるシム法を適用
した場合のハイブリッド型ウィグラの状態を示す図。FIG. 5 is a diagram showing a state of a hybrid wiggler when a shim method, which is a conventional magnetic field intensity fine adjustment method, is applied.
【図６】従来の磁場強度微調整方法である磁極変位法を
適用した場合のハイブリッド型ウィグラの状態を示す
図。FIG. 6 is a diagram showing a state of a hybrid wiggler when a magnetic pole displacement method, which is a conventional magnetic field strength fine adjustment method, is applied.
１…永久磁石、 ２…ポールピース（磁
性体）、 ３…背面シム（強磁性体片）、 ４…磁力線。1 ... Permanent magnet, 2 ... Pole piece (magnetic material), 3 ... Back shim (ferromagnetic material piece), 4 ... Magnetic force line.
Claims (1)
向きにして並べ、それぞれの磁石の間に磁性体を挿入し
て形成される周期磁場発生装置の磁場強度微調整方法に
おいて、 磁場の微調整が必要な永久磁石の背面側に当該磁石を挟
むようにコの字型形状の強磁性体片を取り付けることに
より磁場を調整することを特徴とする周期磁場発生装置
の磁場強度微調整方法。1. A method for finely adjusting the magnetic field strength of a periodic magnetic field generator, comprising: arranging a number of permanent magnets with the directions of the magnetic fields alternately reversed, and inserting a magnetic material between the magnets. Fine adjustment of the magnetic field strength of the periodic magnetic field generator characterized in that the magnetic field is adjusted by attaching a U-shaped ferromagnetic piece so as to sandwich the magnet on the back side of the permanent magnet that requires fine adjustment. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27820193A JPH07135100A (en) | 1993-11-08 | 1993-11-08 | Method of fine adjustment of magnetic field intensity for periodic magnetic field generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27820193A JPH07135100A (en) | 1993-11-08 | 1993-11-08 | Method of fine adjustment of magnetic field intensity for periodic magnetic field generating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07135100A true JPH07135100A (en) | 1995-05-23 |
Family
ID=17594012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27820193A Withdrawn JPH07135100A (en) | 1993-11-08 | 1993-11-08 | Method of fine adjustment of magnetic field intensity for periodic magnetic field generating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07135100A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109561566A (en) * | 2018-11-27 | 2019-04-02 | 中国原子能科学研究院 | The cyclotron radial convergence method of the magnet assemblies of track is rocked based on generation |
-
1993
- 1993-11-08 JP JP27820193A patent/JPH07135100A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109561566A (en) * | 2018-11-27 | 2019-04-02 | 中国原子能科学研究院 | The cyclotron radial convergence method of the magnet assemblies of track is rocked based on generation |
| CN109561566B (en) * | 2018-11-27 | 2019-10-15 | 中国原子能科学研究院 | The cyclotron radial convergence method of the magnet assemblies of track is rocked based on generation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010130 |