JPH0227700A - low emittance sling - Google Patents
low emittance slingInfo
- Publication number
- JPH0227700A JPH0227700A JP17504088A JP17504088A JPH0227700A JP H0227700 A JPH0227700 A JP H0227700A JP 17504088 A JP17504088 A JP 17504088A JP 17504088 A JP17504088 A JP 17504088A JP H0227700 A JPH0227700 A JP H0227700A
- Authority
- JP
- Japan
- Prior art keywords
- deflection
- achromatic
- magnet
- emittance
- magnets
- 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
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- Particle Accelerators (AREA)
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、電子加速器の一種である電子蓄積リングに係
り、特に、高輝度シンクロトロン放射光装置に好適な低
エミツタンスの電子蓄積リングに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electron storage ring which is a type of electron accelerator, and particularly relates to a low emittance electron storage ring suitable for a high-brightness synchrotron radiation device.
(従来の技術〕
従来の低エミツタンスの電子蓄積リングについては、ニ
ュークリア インスツルメンツ アンドメソッド イン
フィジックス リサーチ ェ−246(1986年)
第4頁から第11頁(Nuclear Instrum
ents and Methods in Physi
csResearch A246(1986)I’P4
−11)において論じられている。(Prior art) Regarding the conventional low emittance electron storage ring, see Nuclear Instruments and Methods in Physics Research A-246 (1986).
Pages 4 to 11 (Nuclear Instrument
ents and Methods in Physi
csResearch A246 (1986) I'P4
-11).
低エミツタンスの電子蓄積リングのラティス(磁石の配
列)は、FODOタイプ、 Chasman−Gree
nタイプ、あるいはT B A (Triple Be
nd Achromat)タイプが知られているが、い
ずれも偏向部の長さは等しい。一部、例外的ではあるが
、前述した文献に記載されたFODOタイプのラティス
では、偏向部の長さが異なる二種類の偏向磁石が用いら
れている、しかし、この場合、片側の直線部のエネルギ
分散関数7がOである、いわゆる、アクロマテイツク偏
向部がその他の偏向部に比べて畏くなっている。The lattice (array of magnets) of the low emittance electron storage ring is FODO type, Chasman-Gree.
n type, or TBA (Triple Be
nd Achromat) type is known, but the length of the deflection part is the same in all of them. Although there are some exceptions, the FODO type lattice described in the above-mentioned literature uses two types of deflection magnets with different lengths of the deflection part. The so-called achromatic deflection section, in which the energy dispersion function 7 is O, is more difficult than the other deflection sections.
上記従来技術では、非アクロマテイツク偏向部に基づく
低エミツタンス特性が軽視されており、同じダイナミッ
クアパーチャ、及び、8i幅依存のチューンシフト特性
のもとで、効率の良い低エミツタンス化がなされていな
いという問題があった。In the above conventional technology, the low emittance characteristic based on the non-achromatic deflection section is neglected, and the problem is that efficient low emittance is not achieved under the same dynamic aperture and 8i width dependent tune shift characteristic. was there.
本発明の目的は、ダイナミックアパーチャ及び振幅依存
のチューンシフト特性を損なうことなく。The object of the present invention is to maintain dynamic aperture and amplitude dependent tune shifting characteristics.
効率良くエミツタンスを低くするリングを提供すること
にある。The objective is to provide a ring that efficiently lowers emittance.
上記目的は、ラティスの偏向部をアクロマテイツク偏向
部、及び、非アクロマテイツク偏向部で構成し、非アク
ロマテイツク偏向部をアクロマテイツク偏向部より長く
することにより達成される。The above object is achieved by forming the deflection section of the lattice into an achromatic deflection section and a non-achromatic deflection section, the non-achromatic deflection section being longer than the achromatic deflection section.
電子蓄積リングの平衡エミツタンスε0は、放射励起、
及び、放射減衰の釣り合いで決まり、ラティスの偏向部
のラティス特性部に依存し、次式%式%
〈〉、&寥 :偏向部での平均値
α、β、ν:ツウイスパラメータ
η :エネルギ分散関数
q′ :ηの軌道方向の勾配
moC”
ζ :偏向部の中心軌道の曲率半径
Jx :水平方向のダンピング パーティション ナン
バー(da+iping
Partition number)
ここで、< H> −a xは、
< H>−ax =ζh、θ3 ・・・・・・(
2)と書ける。ここに、θは偏向部の偏向角を表わす。The equilibrium emittance ε0 of the electron storage ring is determined by the radiative excitation,
It is determined by the balance of radiation attenuation, and depends on the lattice characteristic part of the deflection part of the lattice, and is expressed by the following formula: %〈〉, &寥: Average values at the deflection part α, β, ν: Twiss parameter η: Energy Dispersion function q': Gradient of η in the orbital direction moC'' ζ: Radius of curvature of the center orbit of the deflection section Jx: Horizontal damping partition number (da+iping partition number) Here, <H> -a x is <H> −ax = ζh, θ3 ・・・・・・(
2) can be written. Here, θ represents the deflection angle of the deflection section.
ここで、非アクロマテイツク偏向部のり、は、アクロマ
テイツク偏向部に比べて、1/3の最小値を得ることが
できる。非アクロマテイツク偏向部とアクロマテイツク
偏向部の数の比をnt: nzとおくと、エミツタンス
ε0は。Here, the non-achromatic deflection section can obtain a minimum value of 1/3 of that of the achromatic deflection section. If the ratio of the number of non-achromatic deflection sections and achromatic deflection sections is nt:nz, then the emittance ε0 is.
n1θ1+nzθ2
ここに、
θl ニアクロマティック偏向部の偏向角θ2 :非ア
クロマテイツク偏向部の偏向角である。n1θ1+nzθ2 where: θl Deflection angle of the near-chromatic deflection section θ2: Deflection angle of the non-achromatic deflection section.
従って、θ2〉θ1の方がエミツタンスε0を効率よく
小さくすることができる。Therefore, emittance ε0 can be more efficiently reduced when θ2>θ1.
以下、本発明の一実施例を第1図により説明する。 An embodiment of the present invention will be described below with reference to FIG.
電子蓄積リングを構成するラティスは、−周にわたって
複数の周期をもち、第1図にはその一周期のラティスの
みを示している。このラティスは、電子を偏向させる二
個のアクロマテイツク偏向磁石11と一個の非アクロマ
テイツク偏向磁石12゜及び、電子軌道100を水平及
び垂直方向に収束させる四極磁石21,22,23,3
1,32゜33等により構成される。The lattice constituting the electron storage ring has a plurality of periods over -circulations, and FIG. 1 shows only one period of the lattice. This lattice consists of two achromatic deflection magnets 11 and one non-achromatic deflection magnet 12° that deflect electrons, and quadrupole magnets 21, 22, 23, 3 that focus electron trajectories 100 horizontally and vertically.
It is composed of 1,32°33, etc.
この場合、アクロマテイツク偏向磁石11を非アクロマ
テイツク偏向磁石12より長くする。In this case, the achromatic deflection magnet 11 is made longer than the non-achromatic deflection magnet 12.
本実施例によれば、比較的短い周期で効率良くエミツタ
ンスを下げることができる。According to this embodiment, the emittance can be efficiently lowered in a relatively short cycle.
次に、本発明の他の実施例を第2図により説明する。Next, another embodiment of the present invention will be described with reference to FIG.
一周期をなすラティスは、二個のアクロマテイツク偏向
磁石11と、二個の非アクロマテイツク偏向磁石12.
及び、電子軌道を水平方向に収束させる四極磁石31,
32,33、垂直方向に収束させる四極磁石21,22
.等により構成される。そして、これら二種類の四極磁
石が交互に配置されたFODOタイプのラティスを形成
する。A periodic lattice consists of two achromatic deflecting magnets 11 and two non-achromatic deflecting magnets 12.
and a quadrupole magnet 31 that converges the electron trajectory in the horizontal direction,
32, 33, quadrupole magnets 21, 22 converging in the vertical direction
.. It is composed of etc. Then, a FODO type lattice is formed in which these two types of quadrupole magnets are alternately arranged.
本実施例によれば、比較的短い周期で、第一図の実施例
に比べ、さらに効率良くエミツタンスを下げることがで
き、四極磁石も少なくて済む。According to this embodiment, the emittance can be lowered more efficiently in a relatively short cycle than the embodiment shown in FIG. 1, and the number of quadrupole magnets can be reduced.
本発明によれば、ダイナミックアパーチャ(電子の水平
・垂直面内の安定周回領域)、及び、振幅依存のチュー
ンシフトの特性を損なうことなく。According to the present invention, the dynamic aperture (stable orbiting region of electrons in the horizontal and vertical planes) and amplitude-dependent tune shift characteristics are not impaired.
効率良くエミツタンスを小さくすることができる。Emittance can be reduced efficiently.
第1図は本発明の一実施例の説明図、第2図は本発明の
他の実施例の説明図である。
11・・・アクロマテイツク偏向磁石、12・・・非ア
クロマテイツク偏向磁石、21,22.23・・・水平
方向収束用四極磁石、31,32.33・・・垂直方向
収束用四極磁石、100・・・電子軌道。FIG. 1 is an explanatory diagram of one embodiment of the present invention, and FIG. 2 is an explanatory diagram of another embodiment of the present invention. 11... Achromatic deflection magnet, 12... Non-achromatic deflection magnet, 21, 22. 23... Quadrupole magnet for horizontal direction focusing, 31, 32.33... Quadrupole magnet for vertical direction focusing, 100...・Electron orbit.
Claims (1)
、 前記偏向磁石をアクロマテイツク及び非アクロマテイツ
クの二種類で構成し、前記非アクロマテイツク偏向磁石
の軌道方向の長さを前記アクロマテイツク偏向磁石より
長くしたことを特徴とする低エミツタンスリング。 2、特許請求の範囲第1項において、 二個の前記アクロマテイツク偏向磁石の間に一個の前記
非アクロマテイツク偏向磁石を設けたことを特徴とする
低エミツタンスリング。 3、特許請求の範囲第1項において、 二個の前記アクロマテイツク偏向磁石の間に二個の前記
非アクロマテイツク偏向磁石を設けたことを特徴とする
低エミツタンスリング。[Scope of Claims] 1. In an electron accelerator consisting of a deflection magnet and a quadrupole magnet, the deflection magnet is composed of two types, an achromatic deflection magnet and a non-achromatic deflection magnet, and the length of the non-achromatic deflection magnet in the orbit direction is determined by the achromatic deflection magnet. A low emittance sling characterized by being longer than a magnet. 2. The low emittance ring according to claim 1, characterized in that one of the non-achromatic deflection magnets is provided between the two achromatic deflection magnets. 3. A low emittance ring according to claim 1, characterized in that two of the non-achromatic deflection magnets are provided between the two achromatic deflection magnets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17504088A JPH0227700A (en) | 1988-07-15 | 1988-07-15 | low emittance sling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17504088A JPH0227700A (en) | 1988-07-15 | 1988-07-15 | low emittance sling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0227700A true JPH0227700A (en) | 1990-01-30 |
Family
ID=15989164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17504088A Pending JPH0227700A (en) | 1988-07-15 | 1988-07-15 | low emittance sling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0227700A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008503037A (en) * | 2004-06-16 | 2008-01-31 | ゲゼルシャフト フュア シュヴェリオーネンフォルシュング ミット ベシュレンクテル ハフツング | Particle accelerator for ion beam radiation therapy |
-
1988
- 1988-07-15 JP JP17504088A patent/JPH0227700A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008503037A (en) * | 2004-06-16 | 2008-01-31 | ゲゼルシャフト フュア シュヴェリオーネンフォルシュング ミット ベシュレンクテル ハフツング | Particle accelerator for ion beam radiation therapy |
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