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The Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences (BINP SB RAS), plans to create the Super Charm-Tau Factory (SCTF) accelerator complex, it will operate in a wide energy range of 2E = 2–5 GeV in c.m. and have design luminosity of L = 1 × 1035 cm–2 s–1. As part of the physical program, it is proposed to carry out the experiment by measuring the Weinberg running weak mixing angle for the J/ψ meson energy. Due to the smallness of the predicted effect, it is necessary to exclude the influence of systematic errors from unpredictable changes in the magnet lattice and the beam background. To do this, we have to organize frequent changes in sign of the longitudinal polarization of the electron beam at the interaction point. In this paper we have investigated the possibility of the spin-flip using the spin RF-rotator in a colliding electron ring with three Siberian snakes. Based on the simulation results, conclusions about the possibility of using this approach are made. [ABSTRACT FROM AUTHOR]

In future electron-positron colliders, such as FC-ee and CEPC, it is planned to accurately measure the beam energy by resonance depolarization. In this paper, we propose an alternative approach based on the rapid resonant rotation of the spins into the horizontal plane of the ring and their subsequent free rotation around the equilibrium vertical direction. The frequency of free coherent spin precession is proposed to be measured by the beats of the number of scattering events of electrons interacting with circularly polarized laser light. Fourier analysis of the number of electrons dropped out of the ring aperture to determine the frequency of free precession. In this paper, spin dynamics is simulated at all stages of the process, taking into account synchrotron oscillations and energy diffusion, and statistical estimates of the accuracy of determining the frequency of spin precession for beam parameters in FCC-ee are made. [ABSTRACT FROM AUTHOR]

The VEPP-2000 is an electron–positron collider with round beams built and operating at the Budker Institute of Nuclear Physics (BINP). The collider luminosity was increased twofold last year. The integrated luminosity accumulated over the last year has exceeded 0.3 fb–1, which almost doubled the total data collected since the collider operation began. The short description of the VEPP-2000 complex, current status, and the results are presented in this work. [ABSTRACT FROM AUTHOR]