The Damping Ring for Novosibirsk Φ- and B-factories

Abstract

The Damping Ring is designed to provide the accumulation, cooling and extraction of electron and positron beams at energy of 510 MeV with the particle production rate 2 x 10" per second for injection into @-factory and (after additional acceleration) B-factory. The lattice consists of four symmetrical quadrants. The magnetic field polarity doesn't change by changing the particle sort. To provide a short bunch length ( U cv 5 mm) two warm cavities of 800 kV total RF voltage are used. The single turn injection scheme with the orbit bump and horizontal kick is used. In this report the general parameters D OJI[RIAXE ~B E K M M S E l -9D.. and features of the Damping Ring are presented. The state of 1"the ring design and construction is discussed.-IOCKEP 0 SEPTUYM4WI

Vacuum system of VEPP-2000 accelerator complex

“…Since operation of damping ring is not assumed with circulating beams during long time, it is enough to have the beam lifetime of tens or hundreds seconds. Nevertheless, to avoid the nonlinear resonances due to ion instability the vacuum level must be less than 5 • 10 −9 Torr [5].…”

“…Thus, the old injector was insufficient in positron production rate. Other limitation of VEPP-2000 efficiency is the maximum energy of the booster ring BEP [2] limited at the value of 800 MeV. Even with unlimited beams, the beam-beam parameter decreases after the acceleration in the VEPP-2000 collider as 1/γ 2 .…”

Recent results from e+e− → hadrons

“…Since 1974 the e + e − collider VEPP-2M has been successfully running in the Budker Institute of Nuclear Physics in Novosibirsk in the c.m.energy range from the threshold of hadron production to 1400 MeV [14]. Its maximum luminosity reached ∼ 3 · 10 30 cm −2 s −1 at the φ meson energy.…”

Study of KK coupled decays and K-Be interactions with the CMD-2 detector at VEPP-2M collider

“…As was realized at the very early steps of the φ meson studies at the colliding beam machines, K S K L pairs ( ≈ 34% of all φ decays) can be used as a source for studying CP and CPT violation. These suggestions, including studies of quantum mechanical correlations, were discussed for experiments at the Novosibirsk electron-positron collider VEPP-2M [1]- [3]. The coupled decays of the K S K L pairs will allow demonstration of the quantum mechanical correlations of the two particle decays (Einstein-Podolsky-Rosen paradox) [4].…”