Speaker
Alexandr E. Obrazovsky
(Budker Inst. Novosibirsk)
Description
The new tracking system of the Spherical Neutral Detector for experiments
at the VEPP-2000 e +e− collider in Novosibirsk is described. The system
consists of 9-layer drift chamber with 24 jet cells and proportional chamber
in a common gas volume. Main system features are its small size and high
density of readout electronics channels. The drift chamber provides at least
4 measurements along the track for charged particles within 94 % solid
angle and 9 measurements for particles at large angle with beam axis.
Design angular resolutions for radial tracks are σφ = 0.2 degrees, σθ = 0.3
degrees, the vertex resolution is σR = 0.2 mm. The full-size prototype of the
tracking system is assembled and tested. The wire structure of the
prototype is tensioned in one quadrant of the chamber. Results of the
prototype assembly quality control and tests with radioactive sources and
cosmic rays are presented. They are in good agreement with expected
system parameters.
Author
Alexandr E. Obrazovsky
(Budker Inst. Novosibirsk)
