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真空 ›› 2019, Vol. 56 ›› Issue (1): 16-19.doi: 10.13385/j.cnki.vacuum.2019.01.04

• • 上一篇    

一种用于粒子加速器的新型高流导离子泵

亚历山德罗·阿巴特科拉   

  1. 安捷伦科技真空事业部,意大利 都灵
  • 收稿日期:2018-11-15 出版日期:2019-01-25 发布日期:2019-02-19
  • 作者简介:亚历山德罗·阿巴特科拉,安捷伦科技真空事业部产品经理。

A new high-conductance ion pump for particle accelerator

Alessandro Abatecola   

  1. Agilent Technologies Vacuum Products Division, Torino, Italy
  • Received:2018-11-15 Online:2019-01-25 Published:2019-02-19

摘要: 离子泵(IGP)是一种特别适用于现代加速器设备的真空获得设备。它们具有长寿命、高可靠 性、高清洁度、密闭抽气等特点,并且因为没有振动,不会干扰粒子束的运行轨迹。通常,离子泵通过一个与 主管道形成 T 形的支管与主管道连接,这种连接方式降低了离子泵有效的抽速,并且需要使用复杂且昂贵 的射频(RF)屏蔽。而且,加速粒子通常对杂散磁场比较敏感,由离子泵磁体产生的非对称磁场(对加速器束 线管而言) 是这些杂散磁场的主要来源。安捷伦与 DESY (德国电子同步加速器 Deutsche ElektronenSynchrotron)合作开发了一种新型的高流导离子泵。350 台使用这种创新设计(专利号:EP2 431996A1)的离子 泵,被安装在了 DESY 的 X-FEL 系统上,离子泵在历史上第一次成为了束线管的组成部分。该泵不使用 T 型 支管而是直接安装在束线管上并成为束线管道的一部分,这使得离子泵的有效抽速最大化并简化了安装; 离子泵的磁铁对称的排列在束线管周围,减少了杂散磁场;同时,RF 屏蔽也可以很容易被集成在泵内。该在 线结构的离子泵有望成为类似应用的标准,为全球相关实验室真空系统开辟新的设计方向。

关键词: 粒子加速器, 真空系统, 在线式, 高流导, 离子泵

Abstract: Ion getter pumps (IGPs) are particularly appropriate for use in modern accelerator facilities because of their high reliability, cleanliness and the absence of vibration that could disturb the trajectory of the beam. Normally, T-pieces are used to connect the pumps to the beam tube. These reduce the effective pumping speed and require the use of radiofrequency (RF) shielding which is complicated and expensive. Moreover, very often the accelerated particles are sensitive to stray magnetic fields and the impedance of the surrounding vacuum tube. Magnetic fields generated by the ion pump magnets, which are asymmetrically oriented to the beam tube, can be a major drawback. To overcome these problems, we have developed, in collaboration with the Deutsche Elektronen -Synchrotron (DESY), an innovative in -line ion getter pump which can be mounted directly into a beam line without a T -piece and which has a symmetrical arrangement of the magnets around the beam tube. Additionally, RF shielding can be easily integrated inside the in-line pump. Using this innovative in-line concept (Patent EP2 431996A1) ion pumps will become an integral part of the beam tube for the first time when installed on the X -FEL system at DESY. The arrangement of the magnets and the geometry of the pole piece, used to guide the magnetic field lines, were designed to minimize any disturbance on the beam trajectory. Moreover, the element location inside the pump has been optimized to“selfshield”the beam, without requiring the addition of expensive and complex optical shields. Finally, thanks to the in-line solution, a simple RF shield (a copper coated tube with pumping slits) can now be easily installed directly inside the pump at the accelerator site installed directly inside the pump at the accelerator site.

Key words: particle accelerator, vacuum system, inline, high-conductance, ion pump

中图分类号: 

  • TB752+.52
[1] 骆 伟. 凝汽器真空系统节能改造应用与分析[J]. 真空, 2018, 55(6): 37-41.
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