JPS636799A - Method and apparatus for automatic beam position control - Google Patents
Method and apparatus for automatic beam position controlInfo
- Publication number
- JPS636799A JPS636799A JP14998686A JP14998686A JPS636799A JP S636799 A JPS636799 A JP S636799A JP 14998686 A JP14998686 A JP 14998686A JP 14998686 A JP14998686 A JP 14998686A JP S636799 A JPS636799 A JP S636799A
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- current
- charged particle
- particle beam
- beam position
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- 238000000034 method Methods 0.000 title claims description 7
- 239000002245 particle Substances 0.000 claims description 33
- 238000005259 measurement Methods 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000005284 excitation Effects 0.000 description 7
- 230000001133 acceleration Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 239000013077 target material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101000871498 Homo sapiens m7GpppX diphosphatase Proteins 0.000 description 1
- MIQYPPGTNIFAPO-CABCVRRESA-N PS(6:0/6:0) Chemical compound CCCCCC(=O)OC[C@@H](OC(=O)CCCCC)COP(O)(=O)OC[C@H](N)C(O)=O MIQYPPGTNIFAPO-CABCVRRESA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 102100033718 m7GpppX diphosphatase Human genes 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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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）
本発明はサイクロトロンで加速した荷電粒子をビーム輸
送装置を通してターゲット材料に常に−定した量及び形
状のビームとして照射する自動制御方法及び自動制御装
置に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention provides an automatic control method and apparatus for irradiating charged particles accelerated in a cyclotron onto a target material as a beam with a constant amount and shape through a beam transport device. Regarding.
（従来の技術）
一般に小型のサイクロトロンは第２図の段断面図、第３
図の横断面図に示すように１．上下に対向しているヨー
ク２．３と励磁コイル４，５よりなる電磁石の対向する
磁極間に水平に加速空間１を設け、磁極の中心部にイオ
ン源６を設けである。(Prior art) In general, a small cyclotron is
As shown in the cross-sectional view of the figure, 1. An acceleration space 1 is provided horizontally between opposing magnetic poles of an electromagnet consisting of a yoke 2.3 and excitation coils 4 and 5, which face each other vertically, and an ion source 6 is provided at the center of the magnetic poles.
加速空間１には水平面で上下に対向している２組の同形
の扇形状の電極７，７及び８，８をそれぞれ中心点に対
して対称でかつ水平に配置し、これらの電極７．８には
周波数ｒの発振器９がらの高周波電圧をそれぞれＲＦフ
ァイナルアンプ１ｏ１フィーダー１１を介して印加しで
ある。In the acceleration space 1, two sets of identical fan-shaped electrodes 7, 7 and 8, 8, which are vertically opposed on a horizontal plane, are arranged horizontally and symmetrically with respect to the center point, and these electrodes 7.8 A high frequency voltage from an oscillator 9 having a frequency r is applied through the RF final amplifier 1o1 feeder 11, respectively.
また加速空間ｌは真空ポンプ２６．２７で真空にしてあ
り、励磁コイル４，５は可変直流電源２５で励磁されて
いる。Further, the acceleration space 1 is evacuated by vacuum pumps 26 and 27, and the excitation coils 4 and 5 are excited by a variable DC power supply 25.
このような構造のサイクロトロンでイオン源６から放出
された荷電粒子は励磁コイル４，５で励磁されている磁
極間の加速空間１内を磁場で拘束され、電極７，８によ
りＲ１”電界で加速されて２＃ｉＳＳ状の運動をし、最
終的には偏向デフレクタ１４で荷電粒子ビーム１５を取
出し口１６に誘導する。In a cyclotron with such a structure, charged particles emitted from the ion source 6 are restrained by a magnetic field in the acceleration space 1 between the magnetic poles excited by the excitation coils 4 and 5, and are accelerated by the R1'' electric field by the electrodes 7 and 8. Then, the charged particle beam 15 is guided to the extraction port 16 by the deflector 14 .
この場合荷電粒子ビーム１５の速度は電極７，８に印加
するＲＦ雷電圧周波数と、この場合に必要な励磁コイル
４，５の励磁電流の調節により適宜に選ぶことが出来る
。In this case, the speed of the charged particle beam 15 can be appropriately selected by adjusting the RF lightning voltage frequency applied to the electrodes 7 and 8 and the excitation current of the excitation coils 4 and 5 required in this case.
取出し口１６の外部には荷電粒子ビーム１５を輸送する
ビーム輸送装置１７が設けてあり、荷電粒子ビーム１５
はビーム輸送装置１７及びこの中に設けられているビー
ム位置調節袋Ｗ１９を通ってターゲットボックス１８内
のターゲット材料を照射する。A beam transport device 17 for transporting the charged particle beam 15 is provided outside the extraction port 16.
irradiates the target material in the target box 18 through the beam transport device 17 and the beam position adjustment bag W19 provided therein.
第４図はビーム輸送装置１７内に設けたビーム位置調節
装置１９の（イ）示は縦断面図、（ロ）示は測定用電極
２１の配置図、（ハ）示はステアリングマグネット２０
の断面図で、荷電粒子ビーム１５の流れ方向（大矢印）
の上流側にビーム位置偏向用の互いに直交する２対のス
テアリングマグネット２０を設け、下流側にビーム位置
測定用の互いに直交す、る２対の４個の測定用電極２１
が設けである。この測定用電極２１はいずれも対地絶縁
してあり、荷電粒子ビーム１５が衝突すると、その荷電
粒子量に応じて接地間にビーム検出電流が流れる。この
電流を測定して上記４個の測定用電極２１の検出電流が
等しくなるように上記２対のステアリングマグネット２
０の励磁電流を調節して荷電粒子ビーム１５が対をなす
測定用電極２Ｉの中心線の交点（図の黒丸印）を通るよ
うに手動調節する。FIG. 4 shows (a) a longitudinal sectional view of the beam position adjustment device 19 provided in the beam transport device 17, (b) a layout diagram of the measurement electrode 21, and (c) a steering magnet 20.
In the cross-sectional view, the flow direction of the charged particle beam 15 (large arrow)
Two pairs of steering magnets 20 orthogonal to each other for beam position deflection are provided on the upstream side, and two pairs of four measurement electrodes 21 orthogonal to each other for beam position measurement are provided on the downstream side.
is the provision. These measurement electrodes 21 are all insulated from the ground, and when the charged particle beam 15 collides with them, a beam detection current flows between the ground and the ground according to the amount of the charged particles. This current is measured and the two pairs of steering magnets 2 are arranged so that the detected currents of the four measuring electrodes 21 are equal.
0 excitation current is manually adjusted so that the charged particle beam 15 passes through the intersection of the center lines of the pair of measurement electrodes 2I (black circles in the figure).
なお測定用電極２１は荷電粒子ビーム１５が衝突しても
放射能を持ちにくいようなグラファイトで衝突面をコー
ティングしである。Note that the collision surface of the measurement electrode 21 is coated with graphite, which does not easily generate radioactivity even when the charged particle beam 15 collides with it.
この場合荷電粒子ビーム１５は一部がヨリ定用電極２１
でカットされて損失となるが、第５図示のような荷電粒
子ビームの電流分布図の両側の裾の部分であるので、殆
ど影響はない。In this case, a portion of the charged particle beam 15 is skewed to the fixed electrode 21.
However, since it is located at the tails on both sides of the charged particle beam current distribution diagram as shown in FIG. 5, it has almost no effect.
従来このようにして荷電粒子ビーム１５の位置を中心位
置に調節してからターゲットに照射していた。Conventionally, the position of the charged particle beam 15 was adjusted to the center position in this way before irradiating the target.
（発明が解決しようとする問題点）
上述のように荷電粒子ビーム１５を照射直前に位置調整
するが、照射中の電圧その他種々の変動により荷電粒子
ビーム１５の位置は必ずしも一定せず、照射効率が低下
することがある。(Problems to be Solved by the Invention) As described above, the position of the charged particle beam 15 is adjusted just before irradiation, but the position of the charged particle beam 15 is not necessarily constant due to voltage and other various fluctuations during irradiation, resulting in poor irradiation efficiency. may decrease.
（問題を解決するための手段）
本発明は上述の問題を解決して、照射中も常に一定の位
置を保持出来るビーム位置自動制御方法と、その装置を
提供することを目的とする。(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned problems and provide an automatic beam position control method and apparatus that can maintain a constant position at all times during irradiation.
即ちビーム位置調節装置内のステアリングマグネットを
通過した荷電粒子ビーム位置を、互いに対向しかつ対向
方向が直角である２組の測定用電極で測定し、その結果
各測定用電極で検出したビーム電流のうち、対向する１
組の測定用電極の検出電流を比較器で比較して両電極の
検出電流が等しければ零出力、一方が大きければ正出力
、他方が大きければ負出力を出力し、その出力によって
直流電源からの電流を切換器で前記零出力の場合は遮断
し、前記正出力の場合は正方向の電流に、前記負出力の
場合は負方向の電流に制御して前記ステアリングマグネ
ットの１組の磁場方向を調節し、前記対向する１組と直
交する他の１組の測定用電極及びステアリングマグネッ
トも同様な動作で自動調節して荷電粒子ビームが常に２
組の測定用電極の中央部を通過するように制御する方法
である。That is, the position of the charged particle beam that has passed through the steering magnet in the beam position adjustment device is measured by two sets of measurement electrodes that face each other and whose opposing directions are perpendicular to each other, and as a result, the beam current detected by each measurement electrode is Among them, 1 facing
The detected currents of the pair of measurement electrodes are compared using a comparator, and if the detected currents of both electrodes are equal, a zero output is output, if one is larger, a positive output is output, and if the other is larger, a negative output is output. The direction of the magnetic field of one set of the steering magnets is changed by cutting off the current using a switch when the output is zero, controlling the current to a positive current when the output is positive, and controlling the current to a negative current when the output is negative. The other pair of measurement electrodes and steering magnets perpendicular to the opposing pair are automatically adjusted in the same way so that the charged particle beam is always 2.
This method controls the measurement electrodes so that they pass through the center of the set of measurement electrodes.
またビーム輸送装置内に設けたビーム位置調節装置の互
いに直交する２組の電磁石を設けたステアリングマグネ
ットと、ビーム位置抄出器に設けた互いに対向しかつ対
向方向が互いに直交する２組の測定用電極と、各組の対
向するそれぞれの検出出力の大きさを比較して正出力、
零出力若しくは負出力を出力する比較器と、この比較器
の出力により直流電源からの電流を正方向、遮断若しく
は負方向の電流に切換えて前記ステアリングマグネット
に供給する切換器とを設けた装置である。In addition, there is a steering magnet provided with two sets of electromagnets orthogonal to each other in the beam position adjustment device provided in the beam transport device, and two sets of measurement electrodes provided in the beam position extractor that are opposed to each other and whose opposing directions are perpendicular to each other. The positive output is obtained by comparing the magnitudes of the opposing detection outputs of each pair.
A device equipped with a comparator that outputs a zero output or a negative output, and a switching device that switches the current from the DC power source to a positive direction, cutoff, or negative direction current according to the output of the comparator and supplies it to the steering magnet. be.
（作用）
上述のように何らかの原因で荷電粒子ビーム位置が変化
した場合は、変化した方向の一対のＩＩＩ定用重用電極
出出力に差が出来、その結果比較器と切換器が動作して
荷電粒子ビーム位置を変化前の位置に修正するような方
向の電流がステアリングマグネットに流れ、常に荷電粒
子ビームを設定位置に自動的に保持している。(Function) As mentioned above, if the charged particle beam position changes for some reason, there will be a difference in the output output of the pair of III regular and heavy duty electrodes in the direction of change, and as a result, the comparator and switch will operate and the charged particle beam will change. A current flows through the steering magnet in a direction that corrects the particle beam position to the previous position, automatically holding the charged particle beam at the set position at all times.
（実施例）
第１図は本発明の自動制御装置の制御回路のブロック図
である。測定用電極２１はＡ、ＢとＣ，Ｄでそれぞれ対
向する２対の電極を構成している。(Embodiment) FIG. 1 is a block diagram of a control circuit of an automatic control device of the present invention. The measurement electrodes 21 constitute two pairs of electrodes A, B and C, D, which are opposed to each other.
１対のＡ、 Ｂの出力はそれぞれ比較器２２−１に入
力し、大小を比較される。図中電極対の中心部の黒丸印
は荷電粒子ビームの位置を示したもので、図示のような
中央にあれば４個の測定用電極２１の検出出力はＡ、Ｂ
、Ｃ，Ｄともに等しい値を示すものである。若し何らか
の理由で図中の黒丸位置が例えばＡ側に移動したとする
と、Ｃ，Ｄの検出出力は変化しないが、Ａ、Ｂの検出出
力はＡが大、Ｂが小となる。この検出出力は比較器２２
−１で比較される。上記の場合はＡの検出出力が大きい
ので比較器２２−１の出力は正出力となり、この出力は
増幅器２３−１で増幅され、切換器２４−１を動作させ
て図示しない直流電源（ＤＣＰＳ）からの電流を荷電粒
子ビーム１５が中央に戻る方向にステアリングマグネッ
ト２０のコイルＣ’、Ｄ’ に流す。The outputs of the pair of A and B are respectively input to a comparator 22-1 and compared in magnitude. The black circle mark at the center of the electrode pair in the figure indicates the position of the charged particle beam.
, C, and D both show equal values. If for some reason the position of the black circle in the figure moves to the A side, for example, the detection outputs of C and D do not change, but the detection outputs of A and B become large for A and small for B. This detection output is the comparator 22
-1 is compared. In the above case, since the detection output of A is large, the output of the comparator 22-1 becomes a positive output, and this output is amplified by the amplifier 23-1, and the switch 24-1 is operated to connect to a DC power supply (DCPS, not shown). A current is passed through the coils C' and D' of the steering magnet 20 in the direction in which the charged particle beam 15 returns to the center.
上述と逆方向に荷電粒子ビーム１５が変化した場合は上
述と逆方向の動作をする。荷電粒子ビーム１５の位置が
中央のままで変化しない間はＡ、Ｂの検出出力は等しい
ので、比較器２２−１の出力は零出力であり、切換器２
４−１は遮断状態にあるのでステアリングマグネットの
コイルＣ’ 、Ｄ″には励磁電流が流れず、荷電粒子ビ
ーム１５は偏向することなく通過する。When the charged particle beam 15 changes in the opposite direction to that described above, the operation is performed in the opposite direction to that described above. As long as the position of the charged particle beam 15 remains at the center and does not change, the detection outputs of A and B are equal, so the output of the comparator 22-1 is zero, and the output of the switch 2
4-1 is in the cutoff state, so no excitation current flows through the coils C' and D'' of the steering magnet, and the charged particle beam 15 passes through without being deflected.
測定用電極２１のＣ，Ｄ方向に荷電粒子ビーム１５の位
置が変化した場合も前述の場合と全く同様に動作するの
で説明は省略する。Even when the position of the charged particle beam 15 changes in the C and D directions of the measurement electrode 21, the operation is exactly the same as in the above case, so a description thereof will be omitted.
なおＣ，Ｄ方向の比較器は２２−２、増幅器は２３−２
、切換器は２４−２であり、コイＩしＩｓ Ａ ’、
Ｂ ’で鳴る。The C and D direction comparators are 22-2, and the amplifiers are 23-2.
, the switch is 24-2, and the coil I is A',
B' sounds.
（発明の効果）
上述のように本発明の装置は荷電粒子ビーム１５が常に
測定用電極２１の中心部に自動的に制御されているので
、従来のような初期調節のみではなく、動作中学に制御
しているリアルタイム制御であるので、照射効率を極め
て高くすることが出来る。(Effects of the Invention) As described above, in the device of the present invention, the charged particle beam 15 is automatically controlled to always be at the center of the measurement electrode 21, so that it is not only necessary to perform initial adjustment as in the conventional case, but also to adjust it during operation. Since it is controlled in real time, the irradiation efficiency can be extremely high.
第１図は自動制御装置の制御回路のブロック図、第２図
はサイクロトロンの縦断面図、第３図は同じく横断面図
、第４図はビーム位置調節装置の説明図で、（イ）は縦
断面図、（ロ）は測定用電極の配置図、（ハ）はステア
リングマグネットの断面図、第５図は荷電粒子ビームの
電流分布図である。
Ｉ９：ビーム位置調節装置、 ２０ニステアリングマグ
ネツト、 ２１：測定用電極、 ２２−１．２２−２
：比較器、 ２４−１．２４−２ ：切換器。
１、事件の表示
昭和６１年 特許願 第１４９９８６号２、発明の名称
ビーム位置自動制御方法及び装置
３、補正をする者
事件との関係 特許出願人
４２１ 株式会社 日本製鋼所
４、代理人Fig. 1 is a block diagram of the control circuit of the automatic control device, Fig. 2 is a vertical cross-sectional view of the cyclotron, Fig. 3 is a cross-sectional view of the same, and Fig. 4 is an explanatory diagram of the beam position adjustment device. FIG. 5 is a longitudinal cross-sectional view, (b) is a layout diagram of measurement electrodes, (c) is a cross-sectional view of a steering magnet, and FIG. 5 is a current distribution diagram of a charged particle beam. I9: Beam position adjustment device, 20 Ni steering magnet, 21: Measurement electrode, 22-1.22-2
: Comparator, 24-1.24-2 : Switcher. 1. Indication of the case 1986 Patent Application No. 149986 2. Name of the invention Method and device for automatically controlling beam position 3. Person making the amendment Relationship to the case Patent applicant 421 Japan Steel Works, Ltd. 4, Agent
Claims (1)
おいて、ビーム位置調節装置内のステアリングマグネッ
ト部を通過した荷電粒子ビーム位置を、互いに対向しか
つ対向方向が直角である２組の測定用電極で測定し、そ
の結果各測定用電極で検出したビーム電流のうち、対向
する１組の測定用電極の検出電流を比較器で比較して両
電極の検出電流が等しければ零出力、一方が大きければ
正出力、他方が大きければ負出力を出力し、その出力に
よって直流電源からの電流を切換器で前記零出力の場合
は遮断し、前記正出力の場合は正方向の電流に、前記負
出力の場合は負方向の電流に制御して前記ステアリング
マグネットの１組の磁場方向を調節し、前記対向する１
組と直交する他の１組の測定用電極及びステアリングマ
グネットも同様な動作で自動調節して荷電粒子ビームが
常に２組の測定用電極の中央部を通過するように制御す
ることを特徴とするビーム位置自動制御方法。 ２）サイクロトロンの荷電粒子ビーム位置の制御装置に
おいて、ビーム輸送装置内に設けたビーム位置調節装置
の互いに直交する２組の電磁石を設けたステアリングマ
グネットと、ビーム位置検出器に設けた互いに対向しか
つ対向方向が互いに直交する２組の測定用電極と、各組
の対向するそれぞれの検出出力の大きさを比較して正出
力、零出力若しくは負出力を出力する比較器と、この比
較器の出力により直流電源からの電流を正方向、遮断若
しくは負方向の電流に切換えて前記ステアリングマグネ
ットに供給する切換器とを設けてなるビーム位置自動制
御装置。[Claims] 1) In a method for controlling the position of a charged particle beam in a cyclotron, the position of a charged particle beam that has passed through a steering magnet section in a beam position adjustment device is controlled by two sets whose opposing directions are perpendicular to each other. Among the beam currents measured by the measurement electrodes and detected by each measurement electrode, the detection currents of a pair of opposing measurement electrodes are compared using a comparator, and if the detection currents of both electrodes are equal, the output is zero; If one is larger, it outputs a positive output, if the other is larger, it outputs a negative output, and depending on the output, the current from the DC power source is cut off by a switch in the case of the zero output, and in the case of the positive output, it is changed to a positive direction current, In the case of the negative output, the direction of the magnetic field of one pair of the steering magnets is adjusted by controlling the current in the negative direction, and
Another set of measuring electrodes and a steering magnet perpendicular to the set are automatically adjusted in a similar manner to control the charged particle beam so that it always passes through the center of the two sets of measuring electrodes. Automatic beam position control method. 2) In a cyclotron charged particle beam position control device, a steering magnet provided with two mutually orthogonal sets of electromagnets of a beam position adjustment device provided in a beam transport device, and a steering magnet provided with two sets of mutually opposing electromagnets provided in a beam position detector. Two sets of measuring electrodes whose opposing directions are perpendicular to each other, a comparator that compares the magnitude of the opposing detection outputs of each set and outputs a positive output, zero output, or negative output, and the output of this comparator. A beam position automatic control device comprising: a switching device that switches a current from a DC power source to a positive direction, a cutoff, or a negative direction current and supplies the current to the steering magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14998686A JPS636799A (en) | 1986-06-25 | 1986-06-25 | Method and apparatus for automatic beam position control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14998686A JPS636799A (en) | 1986-06-25 | 1986-06-25 | Method and apparatus for automatic beam position control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS636799A true JPS636799A (en) | 1988-01-12 |
Family
ID=15486968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14998686A Pending JPS636799A (en) | 1986-06-25 | 1986-06-25 | Method and apparatus for automatic beam position control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS636799A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5211400A (en) * | 1975-07-17 | 1977-01-28 | Nisshin Haiboruteeji Kk | Chaged paticle accelerator |
-
1986
- 1986-06-25 JP JP14998686A patent/JPS636799A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5211400A (en) * | 1975-07-17 | 1977-01-28 | Nisshin Haiboruteeji Kk | Chaged paticle accelerator |
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