BINP SB RAS, Novosibirsk, Russia
VEPP-2000 began high energy physics experiments in the end of 2010 and finished its third experimental season in July of 2013. The last season was dedicated to the energy range of 160-510 MeV per beam. Compton back-scattering based energy measurements were used for the regular energy calibration of the VEPP-2000 together with resonance depolarization and NMR based methods. The concept of the round colliding beams lattice along with the precise orbit and lattice correction yielded the high peak luminosity of 1.2×1031 cm-2s-1 at 505 MeV with average luminosity of 0.9×1031 cm-2s-1 per run. The total beam-beam tune shift up to 0.174 was achieved in the runs at 392.5 MeV. This corresponds to beam-beam parameter ξ=0.125 per one interaction point. The injection system is currently being upgraded to allow for the injection of particles at the top energy of VEPP-2000 collider and to eliminate the present lack of positrons.
BINP SB RAS, Novosibirsk, Russia
Luminosity is the main output of colliders, so it is very important to measure it with speed and accuracy. VEPP-2000 has 16 beam profile monitors (BPM) which use CCD-cameras to register synchrotron light in the visible spectrum. Two luminosity estimation methods are presented, both based on beam size analysis. Although the luminosity measurements by particle detectors CMD-3 and SND are slow and have low statistical accuracy for low beam currents, their data can be used to test new faster methods. Additionally, an attempt of the phase space tomography is presented using the simulated BPM measurements of the particle distribution in a strongly non-gaussian beam.