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TY - CONF AU - Timoshenko, M.V. AU - Borin, V.M. AU - Dorokhov, V.L. AU - Meshkov, O.I. AU - Rogovsky, Yu. A. AU - Shwartz, D.B. AU - Zharinov, Yu.M. ED - Schaa, Volker RW TI - Development of Longitudinal Beam Profile Diagnostics for Beam-beam Effects Study at VEPP-2000 J2 - Proc. of IBIC2018, Shanghai, China, 09-13 September 2018 CY - Shanghai, China T2 - International Beam Instrumentation Conference T3 - 7 LA - english AB - The comprehensive development of beam longitudinal profile measurement systems based on stroboscopic optical dissector has started at VEPP-2000 electron-positron collider complex. The dissector was setted and commissioned at booster ring BEP that was deeply upgraded (2013-2015) to achieve top energy of 1 GeV. Bunch lengthening with current was studied at BEP with its new RF-cavity. In addition the method of synchrotron frequency measurement by dissector was applied. After dissector checkouts at BEP the similar studies were carried out with a single beam at VEPP-2000 storage ring in parallel with streak-camera measurements. Good agreement of results was observed. Series of single-turn longitudinal and vertical bunch profiles snapshots was made by streak-camera with respect to delay after counter beam injection. The unexpected longitudinal beam dynamics was observed for intensities above the beam-beam threshold. These studies together with beam-beam coherent oscillations spectra seen by pickups are of a great interest for understanding of flip-flop phenomenon which establish a fundamental luminosity limit at VEPP-2000 operating with round beams. PB - JACoW Publishing CP - Geneva, Switzerland SP - 410 EP - 414 KW - electron KW - synchrotron KW - positron KW - collider KW - injection DA - 2019/01 PY - 2019 SN - 978-3-95450-201-1 DO - DOI: 10.18429/JACoW-IBIC2018-WEPA18 UR - http://jacow.org/ibic2018/papers/wepa18.pdf ER -