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TY - CONF AU - Roussel, E. AU - Bielawski, S. AU - Brubach, J.B. AU - Cassinari, L. AU - Couprie, M.-E. AU - Evain, C. AU - Labat, M. AU - Le Parquier, M. AU - Manceron, L. AU - Ricaud, J.P. AU - Roy, P. AU - Szwaj, C. AU - Tordeux, M.-A. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - A New Scheme for Electro-optic Sampling at Record Repetition Rates : Principle and Application to the First (turn-by-turn) Recordings of THz CSR Bursts at SOLEIL J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - The microbunching instability is an ubiquitous problem in storage rings at high current density. However, the involved fast time-scales hampered the possibility to make direct real-time recordings of theses structures. When the structures occur at a cm scale, recent works at UVSOR*, revealed that direct recording of the CSR electric field with ultra-high speed electronics (17 ps) provides extremely precious informations on the microbunching dynamics. However, when CSR occurs at THz frequencies (and is thus out of reach of electronics), the problem remained largely open. Here we present a new opto-electronic strategy that enabled to record series of successive electric field pulses shapes with picosecond resolution (including carrier and envelope), every 12 ns, over a total duration of several milliseconds. We also present the first experimental results obtained with this method at Synchrotron SOLEIL, above the microbunching instability threshold, and we present direct tests of Vlasov-Fokker-Planck and macroparticle models. The method can be applied to the detection of ps electric fields in other situations where high repetition rate is also an issue. PB - JACoW CP - Geneva, Switzerland SP - 2794 EP - 2797 KW - laser KW - synchrotron KW - real-time KW - storage-ring KW - detector DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-THOBA01 UR - http://jacow.org/ipac2014/papers/thoba01.pdf ER -