JP2003142299A - Electromagnet for ffag accelerator - Google Patents
Electromagnet for ffag acceleratorInfo
- Publication number
- JP2003142299A JP2003142299A JP2001334461A JP2001334461A JP2003142299A JP 2003142299 A JP2003142299 A JP 2003142299A JP 2001334461 A JP2001334461 A JP 2001334461A JP 2001334461 A JP2001334461 A JP 2001334461A JP 2003142299 A JP2003142299 A JP 2003142299A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- electromagnet
- accelerator
- magnetic field
- ffag
- 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.)
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Particle Accelerators (AREA)
- Electromagnets (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ＦＦＡＧ加速器
用電磁石に関し、特にＦＦＡＧ加速器において、ビーム
の入射、取り出しを容易にすると共に、ビームの集束・
発散磁場強度の制御を容易ならしめようとするものであ
る。この発明に係るＦＦＡＧ加速器は、原子力工学の分
野を始めとして、医学や半導体、さらにはバイオ、情
報、環境などの各種分野に適用されるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet for an FFAG accelerator, and more particularly to an FFAG accelerator for facilitating the incidence and extraction of a beam and focusing and focusing the beam.
It aims to facilitate control of the divergent magnetic field strength. The FFAG accelerator according to the present invention is applied to various fields such as medicine, semiconductors, biotechnology, information, and environment, including the field of nuclear engineering.
【０００２】[0002]
【従来の技術】近年、新しい核エネルギーの生成法とし
て、加速器駆動による未臨界原子炉を用いたエネルギー
増幅系が注目されている。この方式では、従来の加速器
における電力効率に比べると、一桁以上の飛躍的なエネ
ルギー効率が必要とされる。2. Description of the Related Art In recent years, an energy amplification system using a subcritical reactor driven by an accelerator has been attracting attention as a new nuclear energy generation method. Compared with the power efficiency of conventional accelerators, this method requires a dramatic energy efficiency of one digit or more.
【０００３】このような要求に応え得る加速器として有
力視されているのが、固定磁場強集束型シンクロトロン
（Fixed Field Altemating Gradient Synchrotron ：以
下、ＦＦＡＧ加速器という）である。このＦＦＡＧ加速
器は、高効率なだけでなく、高繰り返し加速が可能とい
う、優れた特徴を有している。A fixed field strong focusing synchrotron (hereinafter referred to as FFAG accelerator) is regarded as a promising accelerator that can meet such demands. This FFAG accelerator has an excellent feature that not only high efficiency but also high repetitive acceleration is possible.
【０００４】図１に、ラジアル・セクター型のＦＦＡＧ
加速器の構造を模式図で示す。ラジアル・セクター型で
は、磁場の符号が違う磁場を交互に並べることによっ
て、強集束を実現するもので、図中、番号１が集束磁石
（Ｆ）、２が集束磁石１の両側に設けられた発散磁石
（Ｄ）であり、この例ではかようなＤＦＤを１セルとす
る加速器用電磁石が８個設けられている。なお、同図で
は、加速器の下側半分しか示していないが、その上側に
も、同じ構造のものが、各磁石が正対する形で存在して
いる。そして、各電磁石の外周側および内周側にはそれ
ぞれリターンヨーク３，４が設けられていて、集束磁石
１および発散磁石２で発生させたフラックスはそれぞ
れ、これらリターンヨーク３，４を介して正・逆の磁気
回路を構成する仕組みになっている。また、５は、高周
波（ＲＦ）加速装置であり、ＦＦＡＧ加速器一台当た
り、数台が加速器用電磁石の間に配置される。FIG. 1 shows a radial sector type FFAG.
The structure of the accelerator is shown in a schematic diagram. The radial sector type realizes strong focusing by alternately arranging magnetic fields having different magnetic field signs. In the figure, numeral 1 is a focusing magnet (F), and 2 is provided on both sides of the focusing magnet 1. It is a diverging magnet (D), and in this example, eight accelerator electromagnets having such a DFD as one cell are provided. Although only the lower half of the accelerator is shown in the same figure, the magnets of the same structure are also present on the upper side of the accelerator so that the magnets face each other. The return yokes 3 and 4 are provided on the outer peripheral side and the inner peripheral side of each electromagnet, respectively, and the fluxes generated by the focusing magnet 1 and the diverging magnet 2 are positively passed through these return yokes 3 and 4, respectively.・ It is a mechanism that constitutes a reverse magnetic circuit. Further, 5 is a radio frequency (RF) accelerator, and several units are arranged between the accelerator electromagnets per FFAG accelerator.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
ＦＦＡＧ加速器用電磁石は、上記したようなリターンヨ
ークを有する構造になっていることから、ビームの入射
および取り出しが困難なところに問題を残していた。ま
た、ＦＦＡＧ加速器用の電磁石としては、一層の小型化
および超伝導化が要求されているが、従来の電磁石では
かような要求に対しても対応が難しいという問題を抱え
ていた。However, since the conventional FFAG accelerator electromagnet has the structure having the return yoke as described above, there remains a problem in that it is difficult to enter and extract the beam. . Further, further miniaturization and superconductivity are required for the electromagnet for the FFAG accelerator, but the conventional electromagnet has a problem that it is difficult to meet such a requirement.
【０００６】この発明は、上記の現状に鑑み開発された
もので、ビームの入射、取り出しが容易なだけでなく、
小型化および超伝導化が可能で、しかも収束・発散磁場
強度の制御も容易なＦＦＡＧ加速器用電磁石を提案する
ことを目的とする。The present invention has been developed in view of the above-mentioned situation, and not only is it easy to enter and extract a beam,
It is an object of the present invention to propose an electromagnet for an FFAG accelerator, which can be downsized and made superconducting, and whose converging / diverging magnetic field strength can be easily controlled.
【０００７】[0007]
【課題を解決するための手段】さて、発明者は、上記の
目的を達成すべく鋭意研究を重ねた結果、ＦＦＡＧ加速
器におけるビーム軌道保持用磁場の形状が正・逆交番磁
場であることに注目し、集束磁石で発生させたフラック
スを、リターンヨークを介さずに直接、発散磁石に戻す
磁気回路とすることにより、リターンヨークを省略する
ことができ、かくしてビームの入射、取り出しが容易に
なることの知見を得た。また、上記の構造にすれば、電
磁石用コイルは、中央の集束磁石にのみに設けるだけで
も良く、逆磁場部はリターンフラックスとすることがで
きるので、磁石の小型化が可能になるだけでなく、超伝
導化も可能となることの知見を得た。さらに、逆磁場部
のみに磁気抵抗を小さくするヨークを設けることによっ
て、収束・発散磁場強度の制御も容易になることの知見
を得た。この発明は、上記の知見に立脚するものであ
る。As a result of intensive studies to achieve the above object, the inventor has noticed that the shape of the beam orbit holding magnetic field in the FFAG accelerator is a positive / reverse alternating magnetic field. However, by using a magnetic circuit that directly returns the flux generated by the focusing magnet to the diverging magnet without passing through the return yoke, the return yoke can be omitted, thus facilitating beam incidence and extraction. I got the knowledge of. Further, with the above structure, the electromagnet coil may be provided only in the central focusing magnet, and the reverse magnetic field portion can serve as the return flux, so that not only the magnet can be downsized. We have obtained the knowledge that superconductivity is possible. Furthermore, it was found that the control of the converging / diverging magnetic field strength can be facilitated by providing a yoke for reducing the magnetic resistance only in the reverse magnetic field section. The present invention is based on the above findings.
【０００８】すなわち、この発明の要旨構成は次のとお
りである。
１．集束磁石を挟んで両側に発散磁石をそなえるＦＦＡ
Ｇ加速器用電磁石において、集束磁石で発生させたフラ
ックスを、直接、発散磁石に戻す、正・逆磁場の閉じた
磁気回路を形成することを特徴とするＦＦＡＧ加速器用
電磁石。That is, the gist of the present invention is as follows. 1. FFA with divergent magnets on both sides of the focusing magnet
An electromagnet for a FFAG accelerator, characterized in that, in the G accelerator electromagnet, a flux generated by a focusing magnet is directly returned to a diverging magnet to form a closed magnetic circuit of forward and reverse magnetic fields.
【０００９】２．上記１において、電磁石用コイルを中
央の集束磁石のみに設け、逆磁場部である発散磁石はリ
ターンフラックスとすることを特徴とするＦＦＡＧ加速
器用電磁石。2. In the above-mentioned item 1, the FFAG accelerator electromagnet, wherein the electromagnet coil is provided only in the central focusing magnet, and the divergent magnet that is an inverse magnetic field portion serves as a return flux.
【００１０】３．上記１または２において、発散磁石の
両端部の一方または両方に、逆磁場部の磁場抵抗を小さ
くするためのシャントヨークを設けたことを特徴とする
ＦＦＡＧ加速器用電磁石。3. The electromagnet for an FFAG accelerator according to the above 1 or 2, wherein a shunt yoke for reducing the magnetic field resistance of the reverse magnetic field portion is provided at one or both ends of the divergent magnet.
【００１１】４．上記２または３において、集束磁石を
構成する電磁石が超伝導磁石であることを特徴とするＦ
ＦＡＧ加速器用電磁石。4. In the above 2 or 3, F is characterized in that the electromagnet constituting the focusing magnet is a superconducting magnet.
Electromagnet for FAG accelerator.
【００１２】[0012]
【発明の実施の形態】以下、この発明を図面に従い具体
的に説明する。図２に、ＦＦＡＧ加速器において従来用
いられてきた電磁石を斜視図で示す。かような従来の電
磁石では、集束磁石１および発散磁石２で発生させたフ
ラックスはそれぞれ、同図に矢印で示したように、リタ
ーンヨーク３，４を介して磁気回路を構成する仕組みに
なっていて、かかるリターンヨーク３，４は必須のもと
とされていた。しかしながら、このようなリターンヨー
ク３，４が存在すると、図１に破線で示したように、ビ
ームの入射および取り出しは、かようなリターンヨーク
３，４を避けて行わなければなかったことから、その実
施は極めて難しかったのである。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the drawings. FIG. 2 is a perspective view showing an electromagnet conventionally used in the FFAG accelerator. In such a conventional electromagnet, the fluxes generated by the focusing magnet 1 and the diverging magnet 2 are configured to form a magnetic circuit via return yokes 3 and 4, respectively, as indicated by arrows in the figure. Therefore, the return yokes 3 and 4 are considered to be essential. However, if such return yokes 3 and 4 are present, as shown by the broken line in FIG. 1, the incidence and extraction of the beam have to be performed while avoiding such return yokes 3 and 4, The implementation was extremely difficult.
【００１３】次に、図３(a), (b)にそれぞれ、この発明
に従うＦＦＡＧ加速器用電磁石を斜視面で示す。特に同
図(b) は、発散磁石２の両端部にシャントヨーク６を設
けた場合である。なお、図中番号７，８はそれぞれ、集
束磁石および発散磁石用のコイルである。図３(a) に示
したところにおいて、集束磁石１および発散磁石２で発
生させたフラックスはそれぞれ、発散磁石２および集束
磁石１に直接戻す、いわゆる正・逆磁場の閉じた磁気回
路を形成する。従って、従来、不可欠とされたリターン
ヨークは必要ない。Next, FIGS. 3A and 3B are perspective views showing electromagnets for FFAG accelerators according to the present invention. In particular, FIG. 2B shows the case where the shunt yoke 6 is provided at both ends of the diverging magnet 2. The numbers 7 and 8 in the figure are coils for the focusing magnet and the diverging magnet, respectively. As shown in FIG. 3 (a), the fluxes generated by the focusing magnet 1 and the diverging magnet 2 are directly returned to the diverging magnet 2 and the focusing magnet 1 to form a so-called closed magnetic circuit of forward and reverse magnetic fields. . Therefore, the return yoke which has been conventionally indispensable is not necessary.
【００１４】ところで、図３(a) の構造では、逆磁場部
のフラックスの調整ができない。しかしながら、この点
については、同図(b) に示したように、発散磁石２の両
端部の少なくとも一方にシャントヨーク６を設け、リタ
ーンフラックスの一部をこのシャントヨーク６に流すよ
うにすれば、逆磁場部の発散磁場強度の大きさの調整も
自在にできるようになる。By the way, in the structure of FIG. 3A, the flux of the reverse magnetic field portion cannot be adjusted. However, regarding this point, if a shunt yoke 6 is provided on at least one of both ends of the divergent magnet 2 and a part of the return flux is made to flow to this shunt yoke 6, as shown in FIG. Also, it becomes possible to freely adjust the magnitude of the divergent magnetic field strength of the reverse magnetic field section.
【００１５】かくして、ＦＦＡＧ加速器用電磁石を、図
３(a), (b)に示したような構造にすれば、図４に破線に
示すように、ビームの入射および取り出しがどの位置か
らでもできるようになり、その結果、従来に比べてビー
ムの入射および取り出しが格段に容易になる。Thus, if the electromagnet for the FFAG accelerator has the structure shown in FIGS. 3 (a) and 3 (b), the beam can be incident and extracted from any position as shown by the broken line in FIG. As a result, the incidence and extraction of the beam becomes much easier than in the conventional case.
【００１６】さらに、従来は、このようなリターンヨー
クが必要であったことから、その小型化および超伝導化
が難しかった。しかしながら、図３(a), (b)に示したよ
うなこの発明に従う電磁石では、かようなリターンヨー
クが必要なく、さらに電磁石用コイルは中央部の集束磁
石のみに設け、逆磁場部である発散磁石はリターンフラ
ックスで構成する構造とすることができるので、小型化
および超伝導化も容易となる。Further, in the past, since such a return yoke was required, it was difficult to reduce its size and superconductivity. However, in the electromagnet according to the present invention as shown in FIGS. 3 (a) and 3 (b), such a return yoke is not necessary, and the electromagnet coil is provided only in the focusing magnet in the central portion and is the reverse magnetic field portion. Since the divergent magnet can have a structure composed of a return flux, downsizing and superconductivity are facilitated.
【００１７】このように、この発明の電磁石では、基本
的磁場が一つのコイルで形成できるので、構造が極めて
簡単となる利点もある。すなわち、正磁場をつくる電磁
石でもって、同時に逆磁場をつくることができ、ＦＦＡ
Ｇ加速器にとっての基本構造である収束・発散の磁場構
成に適合させることが可能となる。As described above, in the electromagnet of the present invention, since the basic magnetic field can be formed by one coil, there is also an advantage that the structure is extremely simple. That is, an electromagnet that creates a positive magnetic field can simultaneously create a reverse magnetic field.
It becomes possible to adapt to the converging / diverging magnetic field configuration, which is the basic structure for the G accelerator.
【００１８】なお、参考のために、図５に、この発明に
従うＦＦＡＧ加速器用電磁石の全体を斜視面で示す。こ
の例は、集束磁石および発散磁石のそれぞれが、電磁石
用のコイルを有し、かつ発散磁石の両端部にシャントヨ
ークを設けた場合である。なお、図中、ＩF は集束コイ
ル電流、ＩD は発散コイル電流、そしてＢF は集束磁
場、ＢD は発散磁場（逆磁場）である。For reference, FIG. 5 shows a perspective view of the entire electromagnet for FFAG accelerator according to the present invention. In this example, each of the focusing magnet and the diverging magnet has a coil for an electromagnet, and shunt yokes are provided at both ends of the diverging magnet. In the figure, I F is a focusing coil current, I D is a diverging coil current, B F is a focusing magnetic field, and B D is a diverging magnetic field (reverse magnetic field).
【００１９】[0019]
【発明の効果】かくして、この発明によれば、ビームの
入射、取り出しが容易なだけでなく、小型化および超伝
導化が可能で、しかも収束・発散磁場強度の制御も容易
なＦＦＡＧ加速器用電磁石を得ることができる。As described above, according to the present invention, the electromagnet for the FFAG accelerator not only can easily enter and extract the beam, but also can be downsized and made superconducting, and can easily control the converging / diverging magnetic field strength. Can be obtained.
【図１】従来のＦＦＡＧ加速器の模式図である。FIG. 1 is a schematic diagram of a conventional FFAG accelerator.
【図２】従来のＦＦＡＧ加速器用電磁石の模式図であ
る。FIG. 2 is a schematic diagram of a conventional FFAG accelerator electromagnet.
【図３】この発明に従うＦＦＡＧ加速器用電磁石の模式
図である。FIG. 3 is a schematic diagram of an electromagnet for an FFAG accelerator according to the present invention.
【図４】この発明に従うＦＦＡＧ加速器の模式図であ
る。FIG. 4 is a schematic diagram of an FFAG accelerator according to the present invention.
【図５】この発明に従うＦＦＡＧ加速器用電磁石の全体
を示す斜視図である。FIG. 5 is a perspective view showing the entire electromagnet for FFAG accelerator according to the present invention.
１ 集束磁石（Ｆ） ２ 発散磁石（Ｄ） ３ 外周側リターンヨーク ４ 内周側リターンヨーク ５ 高周波（ＲＦ）加速装置 ６ シャントヨーク ７ 集束磁石用のコイル ８ 発散磁石用のコイル 1 Focusing magnet (F) 2 Divergent magnet (D) 3 outer return yoke 4 Inner circumference return yoke 5 Radio Frequency (RF) Accelerator 6 shunt yoke 7 Coil for focusing magnet 8 Coil for divergent magnet
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０５Ｈ 13/08 Ｈ０５Ｈ 13/08 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) H05H 13/08 H05H 13/08
Claims (4)
えるＦＦＡＧ加速器用電磁石において、集束磁石および
発散磁石で発生させたフラックスを、直接、発散磁石お
よび集束磁石に戻す、正・逆磁場の閉じた磁気回路を形
成することを特徴とするＦＦＡＧ加速器用電磁石。1. In a FFAG accelerator electromagnet having a diverging magnet on both sides of a focusing magnet, a flux generated by the focusing magnet and the diverging magnet is directly returned to the diverging magnet and the focusing magnet, and a forward and reverse magnetic field is closed. An electromagnet for an FFAG accelerator, which is characterized by forming a magnetic circuit.
央の集束磁石のみに設け、逆磁場部である発散磁石はリ
ターンフラックスとすることを特徴とするＦＦＡＧ加速
器用電磁石。2. The electromagnet for an FFAG accelerator according to claim 1, wherein the electromagnet coil is provided only in the central focusing magnet, and the divergent magnet serving as a reverse magnetic field portion serves as a return flux.
両端部の一方または両方に、逆磁場部の磁場抵抗を小さ
くするためのシャントヨークを設けたことを特徴とする
ＦＦＡＧ加速器用電磁石。3. The FFAG accelerator electromagnet according to claim 1, wherein a shunt yoke for reducing the magnetic field resistance of the reverse magnetic field portion is provided on one or both ends of the divergent magnet.
構成する電磁石が超伝導磁石であることを特徴とするＦ
ＦＡＧ加速器用電磁石。4. The F according to claim 2, wherein the electromagnet constituting the focusing magnet is a superconducting magnet.
Electromagnet for FAG accelerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001334461A JP3527950B2 (en) | 2001-10-31 | 2001-10-31 | Electromagnet for FFAG accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001334461A JP3527950B2 (en) | 2001-10-31 | 2001-10-31 | Electromagnet for FFAG accelerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003142299A true JP2003142299A (en) | 2003-05-16 |
| JP3527950B2 JP3527950B2 (en) | 2004-05-17 |
Family
ID=19149584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001334461A Expired - Lifetime JP3527950B2 (en) | 2001-10-31 | 2001-10-31 | Electromagnet for FFAG accelerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3527950B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1560475A1 (en) * | 2002-10-25 | 2005-08-03 | Japan Science and Technology Agency | Electron accelerator and radiotherapy apparatus using same |
| CN103228093A (en) * | 2013-04-20 | 2013-07-31 | 胡明建 | Design method of superconductor focusing synchrocyclotron |
| CN114828380A (en) * | 2022-05-20 | 2022-07-29 | 中国原子能科学研究院 | Multi-magnetic-circuit fan-shaped magnet for improving axial focusing force |
-
2001
- 2001-10-31 JP JP2001334461A patent/JP3527950B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1560475A1 (en) * | 2002-10-25 | 2005-08-03 | Japan Science and Technology Agency | Electron accelerator and radiotherapy apparatus using same |
| EP1560475A4 (en) * | 2002-10-25 | 2008-07-09 | Japan Science & Tech Agency | Electron accelerator and radiotherapy apparatus using same |
| CN103228093A (en) * | 2013-04-20 | 2013-07-31 | 胡明建 | Design method of superconductor focusing synchrocyclotron |
| CN114828380A (en) * | 2022-05-20 | 2022-07-29 | 中国原子能科学研究院 | Multi-magnetic-circuit fan-shaped magnet for improving axial focusing force |
| CN114828380B (en) * | 2022-05-20 | 2024-09-27 | 中国原子能科学研究院 | Multi-magnetic loop fan-shaped magnet for improving axial focusing force |
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| Publication number | Publication date |
|---|---|
| JP3527950B2 (en) | 2004-05-17 |
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