Speaker
Mr
Dmitry Shemyakin
(Budker Institute of Nuclear Physics)
Description
The detector tracking system consists of the cylindrical drift chamber (DC) and double-layer cylindrical multi-wire proportional Z-chamber, both used for a trigger, and both are installed inside thin (0.2 X_{0}) superconducting solenoid with 1.3T field.
DC contains 1218 hexagonal cells and allows to measure track parameters with high accuracy (a momentum resolution - 1.5-4.5% for 200-1000 MeV/c momentum, an angular resolution - σ_{φ} = 8−3.5 mrad and σ_{θ} = 20 mrad) as well as specific ionization (σ_{dE/dx}=11-14%). The coordinate along the wire is measured by charge division technique.
Z-chamber provides z-coordinate determination of the tracks with accuracy ∼ 0.5 mm by measuring the cathode strip information. The signals coming from anode sectors are used for the first level trigger and have time jitter ∼ 5 ns.
The ionization losses of pions and kaons in the DC are used for procedure of K/π-separetion. The separation is based on probability density functions for kaons and pions. This method is developed using events of the process e+e- -->K+K-pi+pi-.
Primary author
Mr
Dmitry Shemyakin
(Budker Institute of Nuclear Physics)
