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用于直线加速器相干光源II泵浦-探测实验的高功率、高重复率太赫兹源。

A high-power, high-repetition-rate THz source for pump-probe experiments at Linac Coherent Light Source II.

作者信息

Zhang Z, Fisher A S, Hoffmann M C, Jacobson B, Kirchmann P S, Lee W S, Lindenberg A, Marinelli A, Nanni E, Schoenlein R, Qian M, Sasaki S, Xu J, Huang Z

机构信息

SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.

Argonne National Laboratory, Lemont, IL 60439, USA.

出版信息

J Synchrotron Radiat. 2020 Jul 1;27(Pt 4):890-901. doi: 10.1107/S1600577520005147. Epub 2020 Jun 15.

DOI:10.1107/S1600577520005147
PMID:33565997
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7336180/
Abstract

Experiments using a THz pump and an X-ray probe at an X-ray free-electron laser (XFEL) facility like the Linac Coherent Light Source II (LCLS II) require frequency-tunable (3 to 20 THz), narrow bandwidth (∼10%), carrier-envelope-phase-stable THz pulses that produce high fields (>1 MV cm) at the repetition rate of the X-rays and are well synchronized with them. In this paper, a two-bunch scheme to generate THz radiation at LCLS II is studied: the first bunch produces THz radiation in an electromagnet wiggler immediately following the LCLS II undulator that produces X-rays from the second bunch. The initial time delay between the two bunches is optimized to compensate for the path difference in THz transport. The two-bunch beam dynamics, the THz wiggler and radiation are described, as well as the transport system bringing the THz pulses from the wiggler to the experimental hall.

摘要

在诸如直线加速器相干光源II（LCLS-II）这样的X射线自由电子激光（XFEL）设施中，使用太赫兹泵浦和X射线探针进行的实验需要频率可调谐（3至20太赫兹）、窄带宽（约10%）、载波包络相位稳定的太赫兹脉冲，这些脉冲要以X射线的重复频率产生高场（>1兆伏/厘米），并与X射线良好同步。本文研究了一种在LCLS-II产生太赫兹辐射的双束方案：第一束在紧接LCLS-II产生X射线的第二束的波荡器之后的电磁摇摆器中产生太赫兹辐射。优化两束之间的初始时间延迟以补偿太赫兹传输中的路径差。描述了双束束流动力学、太赫兹摇摆器和辐射，以及将太赫兹脉冲从摇摆器传输到实验大厅的传输系统。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9a0/7336180/18a476df631b/s-27-00890-fig21.jpg
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本文引用的文献

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Volt-per-Ångstrom terahertz fields from X-ray free-electron lasers.来自X射线自由电子激光器的每埃伏特太赫兹场。
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