Controlling beam trajectory and transport in a tapered helical undulator.

IF 2.5 3区 物理与天体物理
Journal of Synchrotron Radiation Pub Date : 2025-03-01 Epub Date: 2025-02-12 DOI:10.1107/S1600577524012463
A Fisher, J Jin, P Musumeci
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引用次数: 0

Abstract

In this paper we present a detailed discussion of the helical undulator system developed for high extraction efficiency experiments in the tapered-enhanced stimulated superradiant amplification regime. The design is based on permanent magnet technology and comprises two Halbach arrays orthogonally oriented and shifted by 90° with respect to each other. When used in low energy beamlines for THz generation, the electron beam trajectory and transport are particularly sensitive to the undulator off-axis fields so that it becomes important to complement on-axis field measurements with analysis and tuning of the higher-order field components. Here we describe how the pulsed wire measurement technique can be effectively used to retrieve on- and off-axis magnetic field characteristics of the undulator. A simple two-dipole model is developed to guide the final adjustments to the permanent magnet positions along the array to tune the quadrupole and sextupole components of the field.

在锥形螺旋波动器中控制光束轨迹和输运。
本文详细讨论了在锥形增强受激超辐射放大条件下为高萃取效率实验而开发的螺旋波动系统。该设计基于永磁体技术,包括两个正交定向的哈尔巴赫阵列,彼此相对移动90°。当用于产生太赫兹的低能束线时,电子束的轨迹和输运对波动的离轴场特别敏感,因此用高阶场分量的分析和调谐来补充轴上场测量变得非常重要。在这里,我们描述了脉冲线测量技术如何有效地用于检索波动器的轴上和离轴磁场特性。建立了一个简单的双偶极子模型来指导沿阵列的永磁体位置的最终调整,以调谐磁场的四极子和六极子分量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Synchrotron Radiation
Journal of Synchrotron Radiation INSTRUMENTS & INSTRUMENTATIONOPTICS&-OPTICS
CiteScore
5.60
自引率
12.00%
发文量
289
审稿时长
1 months
期刊介绍: Synchrotron radiation research is rapidly expanding with many new sources of radiation being created globally. Synchrotron radiation plays a leading role in pure science and in emerging technologies. The Journal of Synchrotron Radiation provides comprehensive coverage of the entire field of synchrotron radiation and free-electron laser research including instrumentation, theory, computing and scientific applications in areas such as biology, nanoscience and materials science. Rapid publication ensures an up-to-date information resource for scientists and engineers in the field.
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