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The system for insertion of a laser beam into the vacuum chamber of high-energy storage ring is described. The main part of the system is the high-vacuum viewport for the IR radiation, based on ZnSe or GaAs crystals. The design of the viewports is presented.

The experiment on laser light backscattering on relativistic electrons was carried out at the VEPP-2000 collider. Laser radiation (λ0 10.6 µm) was scattered head-on the 990 MeV electrons inside the dipole magnet, where an electron orbit radius is about 140 cm. The energies of backscattered photons were measured by the HPGe detector. It was observed experimentally that due to the presence of magnetic field, energy spectrum of backscattered photons differs from the Klein-Nishina cross section. The explanation of the effect is proposed in terms of classical electrodynamics. Moreover, it appears that the exact QED predictions for the phenomenon were done more than 40 years ago.

The review of the SND results of the e + e − → π + π − π 0 process study in the energy range √ s = 0.42 -1.38 GeV at VEPP-2M collider, based on about 2 × 10 6 selected events, is presented. The total cross section, parameters of the ρ, ω, φ resonances, and ω ′ , ω ′′ states were obtained. It was found that ρπ and ωπ 0 intermediate states describe the reaction dynamics. The experimental data cannot be described by a sum of only ω, φ, ω ′ and ω ′′ resonances contributions. This can be interpreted as a manifestation of the ρ → 3π decay, suppressed by G-parity, with relative probability B(ρ → 3π) = (1.