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TY - CONF AU - Saito, H. AU - Hama, H. AU - Hinode, F. AU - Kanomata, K. AU - Kashiwagi, S. AU - Miura, S. AU - Muto, T. AU - Nagasawa, I. AU - Nanbu, K. AU - Ninomiya, S. AU - Takahashi, K. ED - Pei, Guoxi ED - Schaa, Volker RW ED - Chin, Yong Ho ED - Fu, Shinian ED - Zhao, Ning TI - Study on Generation of Variable Polarized Coherent THz Radiation Using a Crossed Undulator J2 - Proc. of LINAC2018, Beijing, China, 16-21 September 2018 CY - Beijing, China T2 - Linear Accelerator Conference T3 - 29 LA - english AB - 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. PB - JACoW Publishing CP - Geneva, Switzerland SP - 157 EP - 159 KW - undulator KW - radiation KW - polarization KW - electron KW - controls DA - 2019/01 PY - 2019 SN - 2226-0366 SN - 978-3-95450-194-6 DO - DOI: 10.18429/JACoW-LINAC2018-MOPO076 UR - http://jacow.org/linac2018/papers/mopo076.pdf ER -