The GMT detector alignment in the STAR experiment
N Ermakov
TL;DR
This paper discusses the alignment of GEM-based chambers (GMT) in the STAR experiment to improve distortion corrections in the TPC, achieving an accuracy of approximately 200 micrometers.
Contribution
The paper presents a method for aligning GMT modules using ionization cluster measurements to enhance TPC distortion corrections.
Findings
GMT modules aligned to ~200 μm accuracy
Improved correction of space charge distortions
Enhanced tracking and particle identification
Abstract
The Solenoidal Tracker At RHIC (STAR) uses the Time Projection Chamber (TPC) to perform tracking and particle identification. In order to improve the corrections (such as space charge) and monitor non-static distortions of the TPC, GEM-based chambers (GMT) were installed at eight locations outside the TPC where they will provide optimal sensitivity to the distortions. In order to reach this goal, the ionization clusters were measured by using the ADC signals in each module. The positions of clusters and their deviations from track projections enabled alignment of the GMT modules with respect to TPC to an accuracy ~ 200{\mu}m.
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