Speaker
Mr.
Nikita Ermakov
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
Description
The Solenoidal Tracker At RHIC (STAR) uses the Time Projection Chamber
(TPC) in order to perform tracking and the particle identification. With
increasing statistics, it has become critical to reduce systematic
uncertainties due to TPC alignment and distortion corrections (such as
space charge, which has also grown with increasing luminosity). In order
to improve these corrections and monitor non-static distortions,
GEM-based chambers (GMT) were installed at eight locations outside TPC
at the Time-Of-Flight (TOF) radius where they will provide the maximum
sensitivity to the distortions. The GMT should have resolution ~150 um
in both longitudinal (drift) and transverse directions and should be
aligned with regard to the TPC by ~200 um. To serve that purpose we
developed the software (Cluster Finder) that searches for clusters in
ADC signals of each module in both directions (longitudinal and transverse) after the pedestal subtraction and measure its positions and deviations. By using this information the
alignment procedure of the modules with regard to TPC has been completed
and the required resolution was achieved.
| Presentation type | Poster |
|---|
Primary author
Mr.
Nikita Ermakov
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
