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TY - CONF AU - Kashiwagi, S. AU - Abe, T. AU - Hama, H. AU - Hinode, F. AU - Muto, T. AU - Nagasawa, I. AU - Nanbu, K. AU - Saito, H. AU - Shibasaki, Y. AU - Takahashi, K. AU - Tokoku, C. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Generation of Coherent Undulator Radiation using Extremely Short Electron Bunch at t-ACTS, Tohoku University J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - An accelerator test facility, t-ACTS, was established at Research Center for Electron Photon Science, Tohoku University, in which an intense coherent terahertz (THz) radiation is generated from an extremely short electron bunch. Velocity bunching scheme in a traveling-wave accelerating structure is employed to produce the short electron bunch, and a production of sub-picosecond electron bunch was demonstrated. A long-period linear undulator, which has 25 periods with a period length of 10 cm and a peak magnetic field of 0.41 T, has been developed to produce intense coherent THz radiation. Properties of the radiation from the THz undulator such as radiation fields, spectrum and angular distribution were numerically investigated based on the parameters of short electron bunch and THz undulator. By optimization of bunch compression, it is possible to extract a coherent radiation of fundamental mode excluding higher-order mode. The detail of the numerical studies for the coherent undulator radiation will be reported in the conference. PB - JACoW CP - Geneva, Switzerland SP - 1760 EP - 1762 KW - radiation KW - undulator KW - electron KW - bunching KW - injection DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-TUPOW009 UR - http://jacow.org/ipac2016/papers/tupow009.pdf ER -