2011
The e+e- collider VEPP2000 at Novosibirsk
by
→
Pacific/Honolulu
417 (Watanabe Hall)
417
Watanabe Hall
Description
SPECIAL HIGH ENERGY PHYSICS SEMINAR
Regular data taking has started at the VEPP2000 collider in Novosibirsk with two detectors - CMD3 and SND. The main purpose is to measure hadronic states in the 0.3-2.0 c.m. energy range with small systematical and statistical errors. This energy range provides the dominant systematic error in the calculations of the hadronic contribution to muon magnetic moment, g-2, of muons. A detailed study of hadron spectroscopy is also planned.
The first "physics" scan of the 1.0-2.0 GeV c.m. energy is going on now. The machine is using a "round beam" approach, which suppresses beam-beam effects and reaches much higher single bunch luminosity, compared to flat beams. Luminosity of about 10*31 cm-2 sec-1 has been reached so far, and is limited by the existing positron source. A new positron source (SLAC klystrons linac + 500 MeV damping ring) is in preparation and promises to reach 10*32 cm-2 sec-1 designed luminosity. Two detectors are taking data at the two available interaction regions.
CMD3 - an almost completly new general purpose magnetic detector with a drift chamber in the thin (0.1 rad. length) solenoid with 1.5T field, surrounded by a liquid Xe calorimeter, and followed by CsI crystals. The end caps are instrumented with BGO crystal calorimeters.
SND - a segmented NaI "crystal ball type " spherical neutral detector with a new tracking system and an aerogel cherenkov counter.
First on-line plots, first detector performance pictures, and few first demonstration (not even preliminary) physics results will be
presented.