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Title	Round Colliding Beams at Vepp-2000 with Extreme Tuneshifts
Authors	D.B. Shwartz, V.V. Anashin, O.V. Belikov, D.E. Berkaev, K. Gorchakov, A.S. Kasaev, A.N. Kirpotin, I. Koop, A.A. Krasnov, G.Y. Kurkin, A.P. Lysenko, S.V. Motygin, E. Perevedentsev, V.P. Prosvetov, D.V. Rabusov, Yu. A. Rogovsky, A.M. Semenov, A.I. Senchenko, D.N. Shatilov, P.Yu. Shatunov, Y.M. Shatunov, O.S. Shubina, M.V. Timoshenko, I.M. Zemlyansky, Yu.M. Zharinov BINP SB RAS, Novosibirsk, Russia I. Koop, E. Perevedentsev, Yu. A. Rogovsky, A.I. Senchenko, Y.M. Shatunov, D.B. Shwartz NSU, Novosibirsk, Russia
Abstract	VEPP-2000 is the only electron-positron collider operating with round beams that allow to enhance beam-beam limit. VEPP-2000 with SND and CMD-3 detectors carried out two successful data-taking runs after new BINP injection complex was commissioned. The 2016/2017 run was dedicated to high energy range (640-1000 MeV per beam) while the 2017/2018 run was focused at 275-600 MeV/beam energies. With sufficient positron production rate and upgraded full-energy booster the collider luminosity was limited by beam-beam effects, namely flip-flop effect. Thorough machine tuning together with new ideas introduced to suppress flip-flop allowed to achieve high beam-beam tuneshift and bunch-by-bunch luminosity values at specific beam energies. The achieved luminosity increased 2-5 times in a whole energy range in comparison to phase-1 operation (2010-2013).
Paper	download MOYBA01.PDF [1.899 MB / 7 pages]
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Conference	eeFACT2018
Series	ICFA ABDW on High Luminosity Circular e$^+$e$^-$ Colliders (62nd)
Location	Hong Kong, China
Date	24-27 September 2018
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Ying-ying Li (HKUST, Hong Kong, China); Lu Li (IMP/CAS, Lanzhou, China); Volker RW Schaa (GSI, Darmstadt, Germany)
Online ISBN	978-3-95450-216-5
Received	11 October 2018
Accepted	19 February 2019
Issue Date	21 April 2019
DOI	doi:10.18429/JACoW-eeFACT2018-MOYBA01
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.