First observation of laser–beam interaction in a dipole magnet

Jiawei Yan; Nanshun Huang; Haixiao Deng; Bo Liu; Dong Wang; Zhentang Zhao

doi:10.1117/1.AP.3.4.045003

Journals >Advanced Photonics >Volume 3 >Issue 4 >Page 045003 > Article

Advanced Photonics
Vol. 3, Issue 4, 045003 (2021)

First observation of laser–beam interaction in a dipole magnet

Jiawei Yan^1、2, Nanshun Huang^1、2, Haixiao Deng^3、*, Bo Liu³, Dong Wang³, and Zhentang Zhao^3、*

Author Affiliations

¹Chinese Academy of Sciences, Shanghai Institute of Applied Physics, Shanghai, China

²University of Chinese Academy of Sciences, Beijing, China

³Chinese Academy of Sciences, Shanghai Advanced Research Institute, Shanghai, China

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DOI: 10.1117/1.AP.3.4.045003 Cite this Article

Jiawei Yan, Nanshun Huang, Haixiao Deng, Bo Liu, Dong Wang, Zhentang Zhao. First observation of laser–beam interaction in a dipole magnet[J]. Advanced Photonics, 2021, 3(4): 045003 Copy Citation Text

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Abstract

As a new-generation light source, free-electron lasers (FELs) provide high-brightness x-ray pulses at the angstrom-femtosecond space and time scales. The fundamental physics behind the FEL is the interaction between an electromagnetic wave and a relativistic electron beam in an undulator, which consists of hundreds or thousands of dipole magnets with an alternating magnetic field. We report the first observation of the laser–beam interaction in a pure dipole magnet in which the electron beam energy modulation with a 40-keV amplitude and a 266-nm period is measured. We demonstrate that such an energy modulation can be used to launch a seeded FEL, that is, lasing at the sixth harmonic of the seed laser in a high-gain harmonic generation scheme. The results reveal the most basic process of the FEL lasing and open up a new direction for the study and exploitation of laser–beam interactions.

Keywords

dipole magnet free-electron laser laser–beam interaction

1 Introduction

A charged particle radiating energy in the form of an electromagnetic wave when it is accelerated is the basic principle behind modern accelerator-based light sources. Among such sources, synchrotron radiation and free-electron lasers (FELs) have played key roles in numerous scientific fields by providing high-brightness electromagnetic waves over a wide spectral range. X-ray FELs,1^,2 which are considered to be the next generation of light sources, are capable of providing femtosecond x-ray pulses with a peak brightness 10 orders of magnitude higher than third-generation synchrotron light sources. Compared to synchrotron radiation, the amplification of the FEL pulse comes from the strong and continuous interaction between an electromagnetic wave and a relativistic electron beam in a periodic lattice of alternating dipole magnetic fields known as an undulator.

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Jiawei Yan, Nanshun Huang, Haixiao Deng, Bo Liu, Dong Wang, Zhentang Zhao. First observation of laser–beam interaction in a dipole magnet[J]. Advanced Photonics, 2021, 3(4): 045003

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laser devices and laser physics

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