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arXiv 1702.05477physics.atom-phphysics.acc-ph
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一种新概念多级塞曼减速器

A new concept multi-stage Zeeman decelerator

Theo Cremers, Simon Chefdeville, Niek Janssen, Edwin Sweers, Sven Koot, Peter Claus, Sebastiaan Y. T. van de Meerakker

摘要:

我们提出了一个新的概念,特别是在分子束散射实验中的应用程序优化的多级塞曼减速器。该减速器由一系列交替的六极孔和六极孔组成,有效地解耦了减速器的横向聚焦和纵向减速特性。它可以在减速和加速模式下运行,也可以在混合模式下运行,混合模式可以引导粒子束以恒定速度通过减速器。减速的特点是相稳定性,具有相对较大的六维相空间接受度。分离的聚焦和减速元件导致纵向和横向方向之间的这种接受的不均等划分。这在散射实验中是理想的,散射实验通常受益于大的纵向接受度与窄的横向分布的组合。我们证明了成功的实验实现这一概念,使用塞曼减速器组成的阵列的25 hexapole和24。减速器的性能在加速,减速和引导模式的特点是使用亚稳态氦($^3S$)原子束。对于初速度为520 m/s的He原子,去除了高达60%的动能。六极由永磁体组成,而六极由冷却液通过的单个中空铜毛细管制成。螺线管设计允许优异的热性能,并且使得能够使用容易获得且便宜的电子元件来脉冲通过螺线管的高电流。这里展示的塞曼减速器在机械上易于构建,可以使用具有成本效益的电子设备进行操作,并且可以以高达10 Hz的重复频率运行

英文摘要:

We present a new concept for a multi-stage Zeeman decelerator that is optimized particularly for applications in molecular beam scattering experiments. The decelerator consists of a series of alternating hexapoles and solenoids, that effectively decouple the transverse focusing and longitudinal deceleration properties of the decelerator. It can be operated in a deceleration and acceleration mode, as well as in a hybrid mode that makes it possible to guide a particle beam through the decelerator at constant speed. The deceleration features phase stability, with a relatively large six-dimensional phase-space acceptance. The separated focusing and deceleration elements result in an unequal partitioning of this acceptance between the longitudinal and transverse directions. This is ideal in scattering experiments, which typically benefit from a large longitudinal acceptance combined with narrow transverse distributions. We demonstrate the successful experimental implementation of this concept using a Zeeman decelerator consisting of an array of 25 hexapoles and 24 solenoids. The performance of the decelerator in acceleration, deceleration and guiding modes is characterized using beams of metastable Helium ($^3S$) atoms. Up to 60 % of the kinetic energy was removed for He atoms that have an initial velocity of 520 m/s. The hexapoles consist of permanent magnets, whereas the solenoids are produced from a single hollow copper capillary through which cooling liquid is passed. The solenoid design allows for excellent thermal properties, and enables the use of readily available and cheap electronics components to pulse high currents through the solenoids. The Zeeman decelerator demonstrated here is mechanically easy to build, can be operated with cost-effective electronics, and can run at repetition rates up to 10 Hz

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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