Study on generation of variable polarized coherent THz radiation using a crossed undulator

Hirotoshi Saito, Hiroyuki Hama, Fujio Hinode, Ken Kanomata, Shigeru Kashiwagi, Sadao Miura, Toshiya Muto, Ikurou Nagasawa, Ken Ichi Nanbu, Shingo Ninomiya, Ken Takahashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A variable polarized THz radiation source using a crossed undulator system has been developed at Tohoku University. In this scheme, two coherent undulator radiations from an extremely short electron bunch are used to control the polarization. They are linearly polarized radiations orthogonal to each other. Polarization of superimposed radiation is controlled by adjusting a relative phase between them. A compact planar undulator with seven periods has been designed for an experiment at our facility. The radiation frequency is 2.06 THz for electron beam energy of 22 MeV. The opening angle of the crossed undulator radiation was estimated to be 34 mrad (FWHM). Since the polarization state of the crossed undulator depends on observation angle, its angular dependence was evaluated. It was found that ideal polarization control is realized only in the angle range of 2.5 mrad, which is quite smaller than that of the radiation itself.

Original languageEnglish
Title of host publicationProceedings of the 29th Linear Accelerator Conference, LINAC 2018
PublisherJACoW Publishing
Pages157-159
Number of pages3
ISBN (Electronic)9783954501946
DOIs
Publication statusPublished - 2020
Event29th International Linear Accelerator Conference, LINAC 2018 - Beijing, China
Duration: 2018 Sep 162018 Sep 21

Publication series

NameProceedings of the 29th Linear Accelerator Conference, LINAC 2018

Conference

Conference29th International Linear Accelerator Conference, LINAC 2018
Country/TerritoryChina
CityBeijing
Period18/9/1618/9/21

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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