Crossed-undulator configuration for variable polarized THz source

H. Saito, H. Hama, S. Kashiwagi, T. Muto, K. Nanbu, N. Morita, H. Yamada

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

Abstract

A variable polarized THz source employing a crossed-undulator configuration has been developed at Research Center for Electron Photon Science (ELPH), Tohoku University. An initial experiment will be demonstrated shortly using newly constructed compact planar undulators at a femtosecond short-bunch facility, t-ACTS, in ELPH. The undulators have equivalent parameters such as the period length of 8 cm and the number of periods is 7, but the field directions are crossed each other perpendicularly. The resonant frequency of 1.94 THz for the beam energy of 22 MeV. Magnetic field measurements have been already performed. The measured field strength distributions of the two undulators were mostly identical to each other. A beam transport line of variable R56 triple bend lattice intersecting the crossed-undulator configuration has been studied for phase control of interference between two radiations (namely the phase shifter). According to a tentative design of the phase shifter beam line, the degree of circular polarization may exceed 0.9 for the fundamental frequency of 1.94 THz in a narrow cone of angular spread of 2 mrad.

Original languageEnglish
Title of host publicationProceedings of the 39th International Free-Electron Laser Conference, FEL 2019
PublisherJACoW Publishing
Pages69-72
Number of pages4
ISBN (Electronic)9783954502103
DOIs
Publication statusPublished - 2019
Event39th International Free-Electron Laser Conference, FEL 2019 - Hamburg, Germany
Duration: 2019 Aug 262019 Aug 30

Publication series

NameProceedings of the 39th International Free-Electron Laser Conference, FEL 2019

Conference

Conference39th International Free-Electron Laser Conference, FEL 2019
Country/TerritoryGermany
CityHamburg
Period19/8/2619/8/30

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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