JPH012300A - electron storage ring - Google Patents
electron storage ringInfo
- Publication number
- JPH012300A JPH012300A JP62-155488A JP15548887A JPH012300A JP H012300 A JPH012300 A JP H012300A JP 15548887 A JP15548887 A JP 15548887A JP H012300 A JPH012300 A JP H012300A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- magnet
- iron
- storage ring
- magnetic pole
- 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.)
- Granted
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 74
- 229910052742 iron Inorganic materials 0.000 claims description 26
- 238000010894 electron beam technology Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 19
- 229910052734 helium Inorganic materials 0.000 description 8
- 239000001307 helium Substances 0.000 description 8
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000012256 powdered iron Substances 0.000 description 7
- 238000005452 bending Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000005469 synchrotron radiation Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はシンクロトロン放射光装置の電子蓄積リングに
係り、特に粒子の軌道のずれを低減するのに好適な偏向
マグネットを有する電子蓄積リングに関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electron storage ring for a synchrotron radiation device, and more particularly to an electron storage ring having a deflection magnet suitable for reducing deviations in the trajectory of particles. It is something.
従来の偏向マグネットは常電導マグネットでフリンジ磁
場が特に問題となることはなかった。そのため特にフリ
ンジ磁場を小さくする処置はとられていない、ただ、軌
道に垂直な半径方向にはシムを付はフリンジ磁場が一様
になるようにしている。なお常電導マグネットの文献と
して高エネルギー物理学研究所の放射光リングフォトン
ファクトリ−の偏向マグネットの設計レポート（１９７
９年６月６日発行）がある。Conventional deflection magnets are normal conducting magnets, and fringe magnetic fields do not pose a particular problem. Therefore, no particular measures are taken to reduce the fringe magnetic field, but shims are attached in the radial direction perpendicular to the orbit to make the fringe magnetic field uniform. In addition, as a reference on normal conducting magnets, there is a design report on deflection magnets of the synchrotron radiation ring photon factory of the High Energy Physics Research Institute (197
(Published June 6, 1999).
蓄積リング、特に放射光発生用電子リングでは、電子を
１０時間程度の長時間保存し続けなければならない。そ
のためには電子軌道を作成するマグネット、特に電子を
偏向させる偏向マグネットに高い磁場均一度が要求され
る。この高い磁場均一度が要求される範囲は、
±（７σ十Ｃ０○、Ｄ、） ・・・（１）だけ必
要となる。ただし、
σ：電子ビームの断面形状がガウス分布をしているとし
たときの標準偏差
Ｃ，Ｏ，Ｏ，：電子軌道の設計軌道からのずれこの高い
磁場均一度が要求される一様磁場領域は、常電導マグネ
ットの場合比較的得やすい。常電導マグネットの場合磁
場強度が低いため鉄心２２は飽和しない。そのため鉄磁
極２３の形によって磁場分布がほぼ決まってしまい、鉄
磁極の形を第２図に示すような形状にして広い一様磁場
領域を得ている。一方、超電導マグネットでは磁場強度
が弱い低磁場では磁極形状で磁場分布が決まり磁場強度
が強い場合鉄心は飽和してしまいコイル配置で磁場分布
が決まる。磁場強度が１゜７Ｔ程度のところでは鉄は一
部が飽和し、一部は未飽和の状態にある。そのため低磁
場から高磁場にわたって常電導マグネットのように広い
一様磁場領域を確保することはむずかしい。そのため超
電導マグネットでは式（１）中の軌道のずｊｃ Ｃ、Ｏ
、Ｄ 、をなるべく小さくする必要がある。In a storage ring, especially in an electron ring for generating synchrotron radiation, electrons must be stored for a long period of time, about 10 hours. To achieve this, a magnet that creates electron trajectories, especially a deflection magnet that deflects electrons, is required to have high magnetic field uniformity. The range where this high magnetic field uniformity is required is ±(7σ0C0○, D,)...(1). However, σ: Standard deviation when the cross-sectional shape of the electron beam has a Gaussian distribution C, O, O: Deviation of the electron orbit from the designed orbit Uniform magnetic field region where high magnetic field homogeneity is required is relatively easy to obtain for normal conducting magnets. In the case of a normal conducting magnet, the magnetic field strength is low, so the iron core 22 is not saturated. Therefore, the magnetic field distribution is almost determined by the shape of the iron magnetic pole 23, and the iron magnetic pole is shaped as shown in FIG. 2 to obtain a wide uniform magnetic field area. On the other hand, in superconducting magnets, in low magnetic fields where the magnetic field strength is weak, the magnetic field distribution is determined by the shape of the magnetic poles, and when the magnetic field strength is strong, the iron core is saturated, and the magnetic field distribution is determined by the coil arrangement. At a magnetic field strength of about 1°7T, part of the iron is saturated and part of it is unsaturated. Therefore, it is difficult to secure a wide uniform magnetic field region from low to high magnetic fields like a normal conducting magnet. Therefore, in a superconducting magnet, the orbital deviation jc C, O in equation (1)
, D , must be made as small as possible.
第３図に超電導の１８０°偏向マグネツトを示す。この
マグネットの軌道方向の磁場分布を３次元の磁場プログ
ラムで計算したものを第４図に示す。図中のＡ点がマグ
ネットの終端である。このように磁場分布はマグネット
終端ＡでＯにならず軌道方向に沿ってなだらかに尾を引
く。第４図に示すようにフリンジ磁場４１がある場合に
ついて。Figure 3 shows a superconducting 180° deflection magnet. Figure 4 shows the magnetic field distribution in the orbital direction of this magnet calculated using a three-dimensional magnetic field program. Point A in the figure is the end of the magnet. In this way, the magnetic field distribution does not become O at the end A of the magnet, but has a gentle tail along the orbital direction. Regarding the case where there is a fringe magnetic field 41 as shown in FIG.
−個の偏向マグネットの偏向角が第５図に示すように、
ｔｓｏ、’（２分割）、９０° （４分割）。- the deflection angles of the deflection magnets are as shown in Fig. 5,
tso,' (2 divisions), 90° (4 divisions).
４５° （８分割）の場合曲率半径をパラメータとして
閉軌道のずれを計算すると第６図となる。ただし閉軌道
とは電子のベータトロン振動といわれる振動が０の場合
の電子軌道である。通常電子はこの閉軌道のまオ）りを
ベータトロン振動しながらリング内を周回する。第６図
より明らかなように閉軌道のずれは、偏向マグネット５
１の曲率半径にはあまり依存せず、偏向マグネット５１
の分割数が多いほど軌道のずれが小さいことがわかる。In the case of 45° (8 divisions), the deviation of the closed orbit is calculated using the radius of curvature as a parameter, as shown in Figure 6. However, a closed orbit is an electron orbit when the vibration called betatron vibration of the electron is 0. Normally, electrons orbit inside the ring while betatron oscillating in this closed orbit. As is clear from Fig. 6, the deviation of the closed orbit is caused by the deviation of the deflection magnet 5.
The deflection magnet 51 does not depend much on the radius of curvature of 1.
It can be seen that the larger the number of divisions, the smaller the trajectory deviation.
従来の電子蓄積リングの１台あたりの偏向マグネットの
偏向角は、４５６程度から１０°程度と小さく、従って
マグネットの分割数も多かったため偏向マグネット内で
の軌道のずれは小さく、又常電導マグネットのため一様
磁場領域が広くとれたためフリンジ磁場による軌道のず
れの問題はさほど重要でなかったことがわかる。The deflection angle of the deflection magnet per conventional electron storage ring was small, from about 456° to about 10°.Therefore, the number of magnet divisions was large, so the deviation of the orbit within the deflection magnet was small, and the deflection angle of the normal conducting magnet was small. Therefore, it can be seen that the problem of trajectory deviation due to fringe magnetic fields was not so important because the uniform magnetic field region was wide.
しかし電子蓄積リングのエネルギーは高いままで小型、
コンパクトにするためには、超電導マグネットを用いか
つ可能なかぎり偏向マグネットの分割数を小さくするこ
とが有利である。偏向マグネットを分割しない場合電子
ビームの収束作用が弱く又電子ビームの性質を変えられ
ないという欠点がある。そのため偏向マグネットを２分
割し、その間に収束マグネット７２を置く第７図のよう
な蓄積リングが最も小型でコンパクトになる。しかしこ
の場合上述したようにフリンジ磁場による偏向マグネッ
ト７１内での軌道のずれが大きい。However, the energy of the electron storage ring remains high and the size is small.
In order to make it compact, it is advantageous to use a superconducting magnet and to reduce the number of divisions of the deflection magnet as much as possible. If the deflection magnet is not divided, the convergence effect of the electron beam is weak and the properties of the electron beam cannot be changed. Therefore, a storage ring as shown in FIG. 7, in which the deflection magnet is divided into two parts and the convergence magnet 72 is placed between them, becomes the smallest and most compact. However, in this case, as described above, the deviation of the trajectory within the deflection magnet 71 due to the fringe magnetic field is large.
そのため式（１）に示す一様磁場範囲を大きくとらなけ
ればならないことになるが、超電導マグネットのため広
い一様磁場範囲は得にくいという問題がある。Therefore, the uniform magnetic field range shown in equation (1) must be widened, but since it is a superconducting magnet, there is a problem that it is difficult to obtain a wide uniform magnetic field range.
第８図に磁場強度３．５Ｔ 、曲率半径０．５ｍで第４
図に示すフリンジ磁場を持つ偏向マグネットの場合の閉
軌道のずれを示す。横軸は第４図のＳである。この場合
偏向マグネット７１内での閉軌道のずれは１ｃｍ以上に
なり、−様磁場領域は±２０ｍｍ程度必要になる。この
位の広さの一様磁ＩＪ）領域を低磁場から高磁場にわた
って確保することが廻しい。しかし±１５ｍｍ位なら困
難であるが実現不可能ではないと思われる。そこで、−
ｒＡＳ＋Ｕ領域の大きさを±１５ｍｍ、ビームサイズ１
．ｍｍ、他の要因による閉軌道のずれを５ｍｍとするフ
リンジ磁場による軌道のずれＣ，Ｏ，Ｄ、Ｆ、は１５）
（７σ＋５十Ｃ，Ｏ，Ｄ、Ｆ）＝１２＋Ｃ，Ｏ，Ｄ、Ｆ
・・・ （１）即ち、Ｃ，Ｏ，Ｄ、Ｆ ＜３ｍｍと
なる。したがってフリンジ磁場による軌道のずれを上記
の値以下にする必要がある。Figure 8 shows the fourth magnetic field with a magnetic field strength of 3.5T and a radius of curvature of 0.5m.
The deviation of the closed orbit in the case of a deflection magnet with a fringe magnetic field shown in the figure is shown. The horizontal axis is S in FIG. In this case, the deviation of the closed orbit within the deflection magnet 71 is 1 cm or more, and the −-like magnetic field region is required to be about ±20 mm. It is advisable to ensure a uniform magnetic IJ) region of this size from low to high magnetic fields. However, if it is about ±15 mm, it would be difficult but not impossible. Therefore, −
rAS+U area size ±15mm, beam size 1
．． mm, and the deviation of the closed orbit due to other factors is 5 mm.The deviation of the orbit due to the fringe magnetic field C, O, D, F is 15)
(7σ+50C,O,D,F)=12+C,O,D,F
... (1) That is, C, O, D, F <3 mm. Therefore, it is necessary to keep the trajectory deviation due to the fringe magnetic field below the above value.
従って１本発明の目的はフリンジ磁場による閉軌道のず
れを数ｍａｎ以下にする手段を提供することにある。Therefore, one object of the present invention is to provide a means for reducing the deviation of the closed orbit due to the fringe magnetic field to several mans or less.
閉軌道は、第８図に示すように４極マグネット出口で中
心軌道の外側を通り、フリンジ磁場により徐々に内側に
曲がり始め、偏向マグネット内では中心軌道の内側を通
過する。このように大きく軌道がずれる原因は、フリン
ジ磁場が４極マグネツトのところまで長く尾を引いてい
るためである。As shown in FIG. 8, the closed orbit passes outside the central orbit at the exit of the quadrupole magnet, gradually begins to curve inward due to the fringe magnetic field, and passes inside the central orbit within the deflection magnet. The reason for such a large orbit deviation is that the fringe magnetic field has a long tail that reaches the quadrupole magnet.
したがって閉軌道のずれを小さくするためにはフリンジ
磁場の尾を引く部分を小さくするとともに、フリンジ磁
場によって内側、に曲げられる分だけあらかじめ外側に
曲げておけばよい。そのためには第１図に示すようにコ
イルを囲むようにして新鉄磁極を設ければ良い。このよ
うにすればこの新鉱磁極より外側には磁束はもれず、か
つ偏向マグネットと逆方向の６ｊ＆場が新鉄磁極部にで
き軌道のずれが修正される。Therefore, in order to reduce the deviation of the closed orbit, it is necessary to reduce the portion where the fringe magnetic field tails, and to bend it in advance to the outside by the amount that is bent inward by the fringe magnetic field. To do this, new iron magnetic poles may be provided to surround the coil as shown in FIG. In this way, magnetic flux will not leak outside the new iron magnetic pole, and a 6j& field in the opposite direction to the deflection magnet will be created at the new iron magnetic pole, correcting the deviation of the orbit.
従来のフリンジ部での磁力線を模式的に示すと第９図の
ようになり、フリンジ磁場が遠くまで影響を及ぼす。The lines of magnetic force at the conventional fringe section are schematically shown in FIG. 9, and the fringe magnetic field has an influence over a long distance.
本発明ではコイルを囲むように新たに鉄磁極を付加する
ことにより、鉄心中のフラックスの一部をこの新磁極に
導く。新磁極部では偏向マグネットと反対方向の磁場が
でき、フリンジ磁場はこの新磁場によりシールディング
され、新磁極より外側では偏向マグネットと同方向の磁
場はなくなる。In the present invention, by adding a new iron magnetic pole to surround the coil, a part of the flux in the iron core is guided to this new magnetic pole. At the new magnetic pole, a magnetic field is generated in the opposite direction to the deflection magnet, and the fringe magnetic field is shielded by this new magnetic field, and outside the new magnetic pole, there is no magnetic field in the same direction as the deflection magnet.
このときの磁場分布は第１０図のようになる。このよう
な磁場分布に電子が入射した場合新磁極より外側では磁
場がないため電子は直進する。新磁極部では電子は外側
に曲げられ、新磁極とマグネットの端までの間は、フリ
ンジ磁場により内側にまげられ、偏向マグネット本体に
はほとんど垂直で軌道がずれない。当然のことながら偏
向マグネット内での閉軌道のずれは小さくなる。The magnetic field distribution at this time is as shown in FIG. When electrons are incident on such a magnetic field distribution, the electrons travel straight because there is no magnetic field outside the new magnetic pole. At the new magnetic pole, the electrons are bent outward, and between the new magnetic pole and the end of the magnet, they are bent inward by the fringe magnetic field, and their orbits are almost perpendicular to the deflection magnet body, so their orbits do not deviate. Naturally, the deviation of the closed orbit within the deflection magnet becomes smaller.
以下、本発明の実施例について説明する。まず蓄積リン
グ全体の構成を説明する。蓄積リングは第７図に示すよ
うに１電子ビームを偏向させる偏向マグネット７１．収
束させる収束マグネット７ｈ。Examples of the present invention will be described below. First, the overall configuration of the storage ring will be explained. As shown in FIG. 7, the storage ring includes a deflection magnet 71. which deflects one electron beam. Convergence magnet 7h for convergence.
および非収束マグネット７３．入射器からの電子を偏向
させ蓄積リングに導き入れるインフレクタ−７４，その
ときの軌道をずらすパータベイタ−７５、電子を加速す
る高周波加速空胴７６、７１！子ビームの位置をモニタ
ーするビーム位置モニター７７、リングの真空チェンバ
ーを高真空にする真空ポンプ７９などからなる。and non-convergent magnet 73. An inflector 74 that deflects electrons from the injector and guides them into the storage ring, a perturbator 75 that shifts the trajectory at that time, and high-frequency acceleration cavities 76 and 71 that accelerate the electrons! It consists of a beam position monitor 77 that monitors the position of the child beam, a vacuum pump 79 that makes the vacuum chamber of the ring a high vacuum, and so on.
電子ビームはこの蓄積リング内をある閉じた１つの軌道
のまわりにベータトロン振動といわれる振動を繰返しな
がら周回する。この閉じた軌道を閉軌道という。偏向マ
グネットや収束マグネットが理想的に作られ、設置誤差
なしに設置された場合は電子の閉軌道は、第７図の実線
の軌道８０となるが、フリンジ磁場などの不整磁場が存
在する場合は、閉軌道はずれて実線とは異なったものと
なる。The electron beam circulates within this storage ring in a closed orbit while repeating oscillations called betatron oscillations. This closed orbit is called a closed orbit. If the deflection magnet or convergence magnet is ideally made and installed without any installation error, the closed orbit of the electron will be the trajectory 80 shown by the solid line in Figure 7. However, if an irregular magnetic field such as a fringe magnetic field exists, , the closed orbit is shifted and becomes different from the solid line.
次にこのフリンジ磁場を発生させる偏向マグネット部に
ついて説明する（第１１図参照）。偏向マグネット部は
コイルの起磁力を小さくする鉄心１１０、磁場を発生さ
せるコイル部１１１．超高真空状態を保ち電子ビームを
ＪＭしておく真空チェンバー１１２．真空チェンバー内
のビー１１恢道面上の垂直方向の磁場分布を作る磁極１
１３からなる。上気の鉄心は磁場強度が弱く鉄が飽和す
る以前のとき、磁場の分布形を決める。Next, the deflection magnet section that generates this fringe magnetic field will be explained (see FIG. 11). The deflection magnet section includes an iron core 110 that reduces the magnetomotive force of the coil, and a coil section 111 that generates a magnetic field. Vacuum chamber 112 that maintains an ultra-high vacuum state and JMs the electron beam. Magnetic pole 1 that creates a vertical magnetic field distribution on the bee 11 conductive surface in the vacuum chamber
Consists of 13. The iron core in the upper air determines the shape of the magnetic field distribution when the magnetic field strength is weak and before the iron is saturated.
コイル部は外部と液体ヘリウムとを断熱するための断熱
真空容器部１１４．真空容器内の熱シールド１１５．断
熱サポート１１６．液体ヘリウ１１を入れるヘリウム容
器１１７．ヘリウム容器内の液体ヘリウム１１８．およ
び液体ヘリウムにつかった超電導コイル１１９よりなる
。本発明では第１図に示すように、この偏向マグネット
に上下の鉄心Ｂｌ、Ｂ２に新たに鉄心ＢＦＩ、ＢＰ２を
付加する。２個の粉鉄磁極ＢＦＩ、１３Ｆ２は、それぞ
れの一端Ｈ，，Ｈ２が偏向マグネットの鉄心に接続され
、他端Ｉ工ｔ Ｌ を軌道面をはさんで相対するように
設置する。この新しい鉄磁極工□。The coil part is a heat insulating vacuum container part 114 for insulating the outside and liquid helium. Heat shield 115 within the vacuum vessel. Insulation support 116. Helium container 117 containing liquid helium 11. Liquid helium 118 in a helium container. and a superconducting coil 119 immersed in liquid helium. In the present invention, as shown in FIG. 1, new iron cores BFI and BP2 are added to the upper and lower iron cores Bl and B2 of this deflection magnet. The two powder iron magnetic poles BFI and 13F2 are installed such that one end H, , H2 of each is connected to the iron core of the deflection magnet, and the other end I (t L ) faces each other across the raceway surface. This new iron magnetic pole work□.
■２ により軌道面上に磁場を作る。■2 Create a magnetic field on the orbital surface.
超導電コイル１に電流を流すとマグネット内の軌道面上
３のみならず、鉄心のない部分４、新たに設けた鉄磁極
部５にも磁場が存在する。鉄心のない部分に発生するフ
リンジ磁場は、粉鉄磁極Ｉ□ｔ Ｌ より内側ではまだ
存在するが、新磁極より外側では新磁極によりシールド
されてしまう。When a current is passed through the superconducting coil 1, a magnetic field exists not only on the raceway surface 3 inside the magnet, but also on the part 4 without the iron core and the newly provided iron magnetic pole part 5. The fringe magnetic field generated in the part without the iron core still exists inside the powder iron magnetic pole I□tL, but outside the new magnetic pole it is shielded by the new magnetic pole.
新磁極部では鉄心中を通るフラックスの一部がこの新鉄
磁極中を通るため偏向マグネットとは逆向きの磁場が生
じる。このような体系の磁場分布を３次元の磁場計算プ
ログラムで計算すると第１２図のようになる。In the new magnetic pole part, a part of the flux passing through the iron core passes through the new iron magnetic pole, creating a magnetic field in the opposite direction to that of the deflection magnet. When the magnetic field distribution of such a system is calculated using a three-dimensional magnetic field calculation program, it becomes as shown in Fig. 12.
フリンジ磁場が生じると閉軌道はずれるが高周波の加速
周波数に同期した電子のみしか、蓄積リング内を周回し
ないため、リング内を一周した閉軌道の長さは常に一定
に保たれ、フリンジ磁場には関係しない。したがってフ
リンジ磁場が存在しても閉軌道の長さは変化しないとい
う条件のもとに閉軌道のずれを求めなければならない。When a fringe magnetic field is generated, the closed orbit shifts, but since only the electrons synchronized with the high-frequency acceleration frequency orbit inside the storage ring, the length of the closed orbit that goes around the ring always remains constant, and is independent of the fringe magnetic field. do not. Therefore, the deviation of the closed orbit must be determined under the condition that the length of the closed orbit does not change even if a fringe magnetic field exists.
さらに注意しなければならないのは、閉軌道に沿った磁
場の積算値をＢｌ、フリンジ磁場がない場合のときのＳ
場の積算値をＢ１゜とじたとき、Ｂ子のエネルギーが
Ｂ１゜
となることである。It is also important to note that the integrated value of the magnetic field along the closed orbit is Bl, and S when there is no fringe magnetic field.
When the integrated value of the field is divided by B1°, the energy of the B child becomes B1°.
ただし、Ｅ、：フリンジ磁場がないときの電子エネルギ
ー式（１）よりフリンジ磁場があると、Ｂ １＞Ｂ ｌ
。となり電子のエネルギーは高くなる。However, E: Electron energy when there is no fringe magnetic field From equation (1), when there is a fringe magnetic field, B 1 > B l
. Therefore, the energy of the electron increases.
偏向マグネット内では磁場強度がかわらず、エネルギー
があるため極率半径がもとの極率半径より大きくなる。Inside the deflection magnet, the magnetic field strength does not change, and because there is energy, the radius of polarity becomes larger than the original radius of polarity.
以上のことを考慮して第１２図のフリンジがあった場合
の閉軌道のずれを計算すると第１３図となる。ただし第
１３図は、４極マグネツトの出口の座標を原点とし、軌
道上に沿い偏向マグネットの中心を終座標としたもので
ある。これより４極マグネット出口では３ｍ＋ａ外側に
軌道がずれており、粉鉄磁極に入ると偏向マグネットと
反対方向の磁場のため外側に軌道がずれる。新鉄磁極部
ＢＦをぬけるとフリンジ磁場のため徐々に内側に軌道が
曲がる。偏向マグネット内では逆に３ｍｍ程度内側に軌
道がずれる。Taking the above into consideration, the deviation of the closed orbit in the case of the fringe shown in FIG. 12 is calculated as shown in FIG. 13. However, in FIG. 13, the origin is the coordinate of the exit of the quadrupole magnet, and the final coordinate is the center of the deflection magnet along the orbit. From this, at the exit of the 4-pole magnet, the trajectory deviates outward by 3 m+a, and when it enters the powder iron magnetic pole, the trajectory deviates outward due to the magnetic field in the opposite direction to the deflection magnet. When passing through the new iron magnetic pole part BF, the orbit gradually curves inward due to the fringe magnetic field. In the deflection magnet, on the other hand, the trajectory shifts inward by about 3 mm.
以上のように新磁極を設ける前は１０ｍ＋ｏ以上閉軌道
がずれていたものが、新磁極を設けたことにより、閉軌
道のずれは数ｍｍ以内に押えられることがわかる。As described above, it can be seen that before the new magnetic poles were provided, the closed orbits were deviated by more than 10 m+o, but by providing the new magnetic poles, the closed orbit deviations were suppressed to within a few mm.
〔実施例２〕
第１４図に示すように偏向マグネットの鉄磁極より外側
に出ている部分の２つのコイルＣ工、Ｃ２について、上
側の部分Ｃ１は上側に、下側の部分Ｃ２は下側に曲げる
ことにより、コイルＣ工。[Example 2] As shown in Fig. 14, regarding the two coils C and C2 that protrude outward from the iron magnetic poles of the deflection magnet, the upper part C1 is placed on the upper side, and the lower part C2 is placed on the lower side. Coil C construction by bending it.
Ｃ２と真空チェンバー１４の間に間隙を作る。この間隙
部にさらに鉄磁極を延長し、コの字状とする。するとフ
リンジ磁場はＲ点より内側だけに存在するようになり、
フリンジ磁場のある領域が狭くなる。新磁極のＲ点と８
点の間は偏向マグネット内の磁場と反対方向を向く磁場
となり、軌道を外側に曲げる役割を果たす。A gap is created between C2 and the vacuum chamber 14. The iron magnetic pole is further extended into this gap to form a U-shape. Then, the fringe magnetic field will exist only inside the R point,
The area with the fringe magnetic field becomes narrower. New magnetic pole R point and 8
Between the points is a magnetic field pointing in the opposite direction to the magnetic field inside the deflection magnet, which serves to bend the orbit outward.
〔実施例３〕
前記実施例２において、第１５図に示すようにコイルＣ
１，Ｃ２の回りに設けた新磁極の一端１１、Ｉ、 を偏
向マグネットの鉄心まで延長し、鉄心と接続する。粉鉄
磁極の断面形状はコの字状である。するとフリンジ磁場
の領域はさらに挟まり、偏向マグネットの磁極間の磁場
と反対方向の磁場ができる新磁極部１５０がひろがる。[Example 3] In Example 2, as shown in FIG.
One end 11, I, of the new magnetic pole provided around 1, C2 is extended to the core of the deflection magnet and connected to the core. The cross-sectional shape of the powdered iron magnetic pole is U-shaped. Then, the region of the fringe magnetic field is further narrowed, and a new magnetic pole portion 150 is expanded, where a magnetic field is generated in the opposite direction to the magnetic field between the magnetic poles of the deflection magnet.
〔実施例４〕
第１６図（ａ）、（ｂ）に示すように鉄磁極にスライド
機構１６０を設け、鉄磁極の一部１６１を可動にしてお
く。この可動部を左右に動かすことによって、鉄心中の
磁路を調節する。すると磁極間ＥＦの磁場強度を変化さ
せることができるため内側に軌道をまげる割合を変化さ
せることができる。そのためこの磁路調節機構により閉
軌道のずれを調節することができる。[Embodiment 4] As shown in FIGS. 16(a) and 16(b), a slide mechanism 160 is provided on the iron magnetic pole, and a part 161 of the iron magnetic pole is made movable. By moving this movable part left and right, the magnetic path in the iron core is adjusted. Then, since the magnetic field strength of the EF between the magnetic poles can be changed, the rate at which the orbit is bent inward can be changed. Therefore, the deviation of the closed orbit can be adjusted by this magnetic path adjustment mechanism.
本発明によれば次の効果が生じる。 According to the present invention, the following effects occur.
１、新たに付加した鉄心部に偏向マグネットと反対方向
の磁場が生じ、軌道が外側に曲げられるため、フリンジ
磁場により内側に曲げられる効果と外側に曲げられる効
果が相殺し合う。そのため偏向マグネットの入口では軌
道は理想軌道と平行になり、入［１での軌道のずれも小
さい。1. A magnetic field in the opposite direction to the deflection magnet is generated in the newly added iron core, bending the track outward, so the effect of bending it inward and the effect of bending it outward due to the fringe magnetic field cancel each other out. Therefore, the trajectory at the entrance of the deflection magnet is parallel to the ideal trajectory, and the deviation of the trajectory at the entrance [1] is also small.
したがって偏向マグネット内でも閉軌道のずれが小さく
、数Ｉｌｌ １１以内の値にすることができるという効
果がある。Therefore, even within the deflection magnet, the deviation of the closed orbit is small, and there is an effect that the deviation can be kept within several Ill11.
第１図（ａ）は偏向マグネットの正面図、第１図（ｂ）
は偏向マグネットの側面図、第２図は常電導マグネット
の側面図、第３図（ａ）は偏向マグネットの平面図、第
３図（ｂ）は正面図、第４図は偏向マグネットの軌道軸
上の磁場強度分布を示す図、第５図（ａ）は偏向マグネ
ットを２分割した電子蓄積リングを示す図、第５図（ｂ
）は４分割リングを示す図、第５図（Ｑ）は８分割リン
グを示す図、第６図（ａ）は偏向マグネット中心部にお
ける閉軌道のずれを示す図、第６図（ｂ）は４極マグネ
ット出口における閉軌道のずれを示す図、第７図は電子
蓄積リングを示す図、第８図は閉軌道のずれを示す図、
第９図は従来のマグネットのフリンジ磁場を模式的に示
す図、第１０図は粉鉄磁極を設けた場合のフリンジ磁場
を模式的に示す図、第１１図は超電導偏向マグネットを
示す図Ｓ第１２図は粉鉄磁極を設けたときの磁場分布を
示す図、第１３図は粉鉄磁極を設けたときの閉軌道のず
れを示す図、第１４図は粉鉄磁極の一端を曲げコイルを
囲む部分を多くした構成を示す図、第１５図は粉鉄磁極
がコイルを完全に囲んだときの構成を示す図、第１６図
（ａ）（ｂ）は粉鉄磁極の一部を可動にし磁路を調節で
きるようにした構成を示す図である。
１・・・超電導コイル、２・・・真空チェンバー、３・
・・電子軌道面、４・・・鉄心のない部分、５・・・新
たに設けた鉄磁極部、２１・・・コイル、２２・・・鉄
心、２３・・・鉄磁極面、３１・・・鉄心、３２・・・
超電導コイル、４１・・・フリンジ部、５１・・・偏向
マグネット、５２・・・収束マグネット、７１・・・偏
向マグネット、７２・・・収束マグネット、７３・・・
非収束マグネット。
７４・・・インフレクタ−１７５・・・パータベイタ−
１７６・・・高周波加速空胴、７７・・・ビーム位置モ
ニター、７８・・・真空チェンバー、７ｉ・・・真空ポ
ンプ、８０・・・ずれのない閉軌道、９１・・・鉄心、
９２・・・コイル、１０１・・・鉄心、１０２・・・粉
鉄磁極、１０３・・・超電導コイル、１１０・・・鉄心
、１１１・・・コイル部、１１２・・・真空チェンバー
、１１３・・・磁極、１１４・・・断熱真空容器、１１
５・・・熱シールド、１１６・・・断熱サポート、１１
７・・・ヘリウム容器。
１１８・・・液体ヘリウム、１１９・・・超電導コイル
、１４１・・・真空チェンバー、１５０・・・新磁極部
、第１図
（α）
も２図
（α）
＾
（ｂ）
３Ｚ−４’も辱コイ１し
括Ｓ図
（α）
ＣＣ）
曲キ千管ア（町
第８図
（α〕
（ｂ）
高１１図
もＩＳ図
Ｂ。Figure 1(a) is a front view of the deflection magnet, Figure 1(b)
is a side view of the deflection magnet, Fig. 2 is a side view of the normal conducting magnet, Fig. 3 (a) is a plan view of the deflection magnet, Fig. 3 (b) is a front view, and Fig. 4 is the orbital axis of the deflection magnet. Figure 5(a) is a diagram showing the magnetic field strength distribution above, Figure 5(a) is a diagram showing an electron storage ring in which the deflection magnet is divided into two parts, Figure 5(b)
) is a diagram showing a 4-divided ring, Figure 5 (Q) is a diagram showing an 8-divided ring, Figure 6 (a) is a diagram showing the deviation of the closed orbit at the center of the deflection magnet, and Figure 6 (b) is a diagram showing the deviation of the closed orbit at the center of the deflection magnet. A diagram showing the deviation of the closed orbit at the exit of the quadrupole magnet, Fig. 7 is a diagram showing the electron storage ring, Fig. 8 is a diagram showing the deviation of the closed orbit,
Fig. 9 is a diagram schematically showing the fringe magnetic field of a conventional magnet, Fig. 10 is a diagram schematically showing the fringe magnetic field when powdered iron magnetic poles are provided, and Fig. 11 is a diagram showing a superconducting deflection magnet. Figure 12 shows the magnetic field distribution when powdered iron magnetic poles are installed, Figure 13 shows the deviation of the closed orbit when powdered iron magnetic poles are installed, and Figure 14 shows the coil by bending one end of the powdered iron magnetic pole. Figure 15 is a diagram showing a configuration with more enclosing parts, Figure 15 is a diagram showing a configuration when the powdered iron magnetic pole completely surrounds the coil, and Figure 16 (a) and (b) are diagrams showing a configuration in which a part of the powdered iron magnetic pole is movable. It is a figure which shows the structure which made it possible to adjust a magnetic path. 1... Superconducting coil, 2... Vacuum chamber, 3.
...electron orbital surface, 4...portion without iron core, 5...newly provided iron magnetic pole section, 21...coil, 22...iron core, 23...iron magnetic pole surface, 31...・Iron core, 32...
Superconducting coil, 41... Fringe portion, 51... Deflection magnet, 52... Convergence magnet, 71... Deflection magnet, 72... Convergence magnet, 73...
Non-convergent magnet. 74... Inflector 175... Perturbator
176... High frequency acceleration cavity, 77... Beam position monitor, 78... Vacuum chamber, 7i... Vacuum pump, 80... Closed orbit without deviation, 91... Iron core,
92... Coil, 101... Iron core, 102... Powder iron magnetic pole, 103... Superconducting coil, 110... Iron core, 111... Coil part, 112... Vacuum chamber, 113...・Magnetic pole, 114...Insulated vacuum container, 11
5... Heat shield, 116... Heat insulation support, 11
7... Helium container. 118...Liquid helium, 119...Superconducting coil, 141...Vacuum chamber, 150...New magnetic pole part, Figure 1 (α) and Figure 2 (α) ^ (b) 3Z-4' too Humiliation Koi 1 Shikaku S Diagram (α) CC) Song Ki Senkan A (Town 8th Diagram (α)) (b) High School 11 Diagram is also IS Diagram B.
Claims (1)
る収束磁石、電子を発散させる発散磁石電子を蓄積して
おく超高真空チェンバーおよび起磁力を低減するための
鉄心と磁場を生じさせる超電導コイルを有する偏向マグ
ネットからなる電子蓄積リングにおいて、超電導コイル
を囲むように一端が偏向マグネットの鉄心に接続され、
他端が軌道面上を中心にして相対するように配置された
鉄磁極を設けたことを特徴とする電子蓄積リング。 ２、特許請求の範囲第１項記載の電子蓄積リングにおい
て、上記電子ビームの軌道の長手方向に取つた上記鉄磁
極の断面形状がコの字状であることを特徴とする電子蓄
積リング。 ３、特許請求の範囲第２項記載の電子蓄積リングにおい
て、上記鉄磁極の上記他端が鉄心に接続されていること
を特徴とする電子蓄積リング。 ４、特許請求の範囲第１項記載の電子蓄積リングにおい
て、上記鉄磁極の一部を可動にし、磁路を調整可能にし
たことを特徴とする電子蓄積リング。[Claims] 1. A high-frequency cavity that accelerates electrons, a converging magnet that converges an electron beam, a diverging magnet that diverges electrons, an ultra-high vacuum chamber that stores electrons, and an iron core that reduces magnetomotive force. In an electron storage ring consisting of a deflection magnet having a superconducting coil that generates a magnetic field, one end is connected to the iron core of the deflection magnet so as to surround the superconducting coil,
An electron storage ring characterized in that the other end is provided with iron magnetic poles arranged to face each other with the center on the orbital surface. 2. The electron storage ring according to claim 1, wherein the iron magnetic pole has a U-shaped cross-section in the longitudinal direction of the trajectory of the electron beam. 3. The electron storage ring according to claim 2, wherein the other end of the iron magnetic pole is connected to an iron core. 4. The electron storage ring according to claim 1, wherein a part of the iron magnetic pole is movable so that the magnetic path can be adjusted.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62155488A JPH0824080B2 (en) | 1987-06-24 | 1987-06-24 | Electron storage ring |
| DE3852218T DE3852218T2 (en) | 1987-06-24 | 1988-06-23 | Electron storage ring. |
| EP88110024A EP0296587B1 (en) | 1987-06-24 | 1988-06-23 | Electron storage ring |
| US07/211,265 US4916404A (en) | 1987-06-24 | 1988-06-24 | Electron storage ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62155488A JPH0824080B2 (en) | 1987-06-24 | 1987-06-24 | Electron storage ring |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPS642300A JPS642300A (en) | 1989-01-06 |
| JPH012300A true JPH012300A (en) | 1989-01-06 |
| JPH0824080B2 JPH0824080B2 (en) | 1996-03-06 |
Family
ID=15607142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62155488A Expired - Lifetime JPH0824080B2 (en) | 1987-06-24 | 1987-06-24 | Electron storage ring |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4916404A (en) |
| EP (1) | EP0296587B1 (en) |
| JP (1) | JPH0824080B2 (en) |
| DE (1) | DE3852218T2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2529492B2 (en) * | 1990-08-31 | 1996-08-28 | 三菱電機株式会社 | Coil for charged particle deflection electromagnet and method for manufacturing the same |
| US5374913A (en) * | 1991-12-13 | 1994-12-20 | Houston Advanced Research Center | Twin-bore flux pipe dipole magnet |
| US5457361A (en) * | 1992-02-17 | 1995-10-10 | Mitsubishi Denki Kabushiki Kaisha | Ion removing device, ion removing method and electron accumulating ring having ion removing device |
| JP2908220B2 (en) * | 1993-12-28 | 1999-06-21 | 住友重機械工業株式会社 | Normal conduction type bending electromagnet |
| US7446636B1 (en) * | 2004-11-10 | 2008-11-04 | John Below | System utilizing the earth's magnetic field to generate a force in opposition to the force of gravity |
| CN106170172A (en) * | 2016-08-30 | 2016-11-30 | 中广核达胜加速器技术有限公司 | A kind of two-way broad width scanning device for low-energy electronic accelerator |
| JP6968329B2 (en) * | 2019-03-27 | 2021-11-17 | ▲華▼中科技大学Huazhong University Of Science And Technology | Electron irradiation system |
| US11483919B2 (en) | 2019-03-27 | 2022-10-25 | Huazhong University Of Science And Technology | System of electron irradiation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE398191B (en) * | 1976-06-03 | 1977-12-05 | Rosander Staffan | PROCEDURE FOR CORRECTION OF ALIGNMENT ERRORS BETWEEN TWO MAGNETIC MAIN FIELDS AND A LINE ACCELERATOR IN A RACE-TRACK MICROTRON, AND DEVICE FOR PERFORMING THE PROCEDURE |
| GB2165988B (en) * | 1984-08-29 | 1988-08-24 | Oxford Instr Ltd | Improvements in devices for accelerating electrons |
| EP0193837B1 (en) * | 1985-03-08 | 1990-05-02 | Siemens Aktiengesellschaft | Magnetic field-generating device for a particle-accelerating system |
-
1987
- 1987-06-24 JP JP62155488A patent/JPH0824080B2/en not_active Expired - Lifetime
-
1988
- 1988-06-23 EP EP88110024A patent/EP0296587B1/en not_active Expired - Lifetime
- 1988-06-23 DE DE3852218T patent/DE3852218T2/en not_active Expired - Fee Related
- 1988-06-24 US US07/211,265 patent/US4916404A/en not_active Expired - Fee Related
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