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TY - CONF AU - Kashiwagi, S. AU - Hama, H. AU - Hinode, F. AU - Kanomata, K. AU - Miura, S. AU - Morita, N.M. AU - Muto, T. AU - Nagasawa, I. AU - Nanbu, K. AU - Ninomiya, S. AU - Saito, H. AU - Takahashi, K. AU - Yamada, H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Status of Test-Accelerator as Coherent THz Source (t-ACTS) at ELPH, Tohoku University J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A test-Accelerator as Coherent Terahertz Source (t-ACTS) has been under development at the Research Center for Electron Photon Science (ELPH), Tohoku University, in which an intense coherent terahertz radiation is generated from the femtosecond electron pulses. Velocity bunching scheme in a traveling accelerating structure is employed to generate femtosecond electron pulses, and the generation of femtosecond electron pulses was confirmed by spectrum analysis of coherent transition radiation using Michelson interferometer. Coherent transition radiation and coherent undulator radiation in the terahertz (THz) region from the short electron pulses has been demonstrated, and their characteristics such as frequency spectrum, spatial distribution and polarization were measured and compared with theoretical calculations. We have succeeded to generate the coherent transition radiation up to approximately 5 THz and the coherent undulator radiation with narrow bandwidth from 2.6 to 3.4 THz. At present, development of a variable polarized THz light source using a crossed-undulator system is being carried out. In addition, we are developing a nondestructive beam monitor using Cherenkov radiation emitted from the electron pulses. The status of t-ACTS will be presented in this conference. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1475 EP - 1477 KW - radiation KW - electron KW - undulator KW - polarization KW - FEM DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW033 UR - http://jacow.org/ipac2019/papers/tupgw033.pdf ER -