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TY - CPAPER AU - Roussel, E. AU - Adachi, M. AU - Bielawski, S. AU - Evain, C. AU - Hofherr, M. AU - Hosaka, M. AU - Ilin, K.S. AU - Katoh, M. AU - Kimura, S.I. AU - Konomi, T. AU - Raasch, J. AU - Scheuring, A. AU - Siegel, M. AU - Szwaj, C. AU - Takashima, Y. AU - Thoma, P. AU - Wuensch, S. AU - Yamamoto, N. AU - Zen, H. TI - Microbunching Instability in Relativistic Electron Bunches: Direct Observations of the Microstructures Using Ultrafast YBCO Detectors J2 - Proc. of International Beam Instrumentation Conference (IBIC2015), Melbourne, Australia, 13-17 September 2015 AB - Relativistic electron bunches circulating in accelerators are subjected to a dynamical instability leading to microstructures at millimeter to centimeter scale. Although this is a well-known fact, direct experimental observations of the structures, or the field that they emit, remained up to now an open problem. Here, we report the direct, shot-by-shot, time-resolved recording of the shapes (including envelope and carrier) of the pulses of coherent synchrotron radiation that are emitted, and that are a 'signature' of the electron bunch microstructure. The experiments are performed on the UVSOR-III storage ring, using electrical field sensitive YBa2Cu3O7−x thin-film ultrafast detectors. The observed patterns are subjected to permanent drifts, that can be explained from a reasoning in phase space, using macroparticle simulations. PB - JACoW CY - Geneva, Switzerland SP - 17 EP - 21 KW - electron KW - detector KW - laser KW - radiation KW - storage-ring DA - 2016/01 PY - 2016 SN - 978-3-95450-176-2 DO - 10.18429/JACoW-IBIC2015-MOCLA01 UR - http://accelconf.web.cern.ch/AccelConf/IBIC2015/papers/mocla01.pdf ER -