PoS - Proceedings of Science
Volume 287 - The 25th International workshop on vertex detectors (Vertex 2016) - Session Operational experience on current detectors
STAR MAPS Vertex Detector operational experience
L. Greiner* on behalf of the STAR collaboration
*corresponding author
Full text: pdf
Pre-published on: February 09, 2017
Published on: August 03, 2017
Abstract
The Heavy Flavor Tracker (HFT) is a set of silicon tracking detectors, which are used by the
Solenoidal Tracker at RHIC (STAR) to extend its measurement capabilities in the heavy flavor
domain. STAR takes data at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National
Laboratory. This system took data in Au+Au collisions, p+p, p+Au and d+Au collisions at √$s_{NN}$ =
200 GeV at RHIC, during the period 2014 - 2016. The innermost high resolution PiXeL detector
(PXL) is the first application of the state-of-the-art thin Monolithic Active Pixel Sensors (MAPS)
technology in a collider environment.
The PXL detector is based on 50 μm-thin MAPS sensors with a pitch of 20.7 μm. Each sensor
includes an array of nearly 1 million pixels, read out in a column parallel rolling shutter mode
with an integration time 185.6 μs. The 170 mW/$cm^{2}$ power dissipation allows for air cooling and
contributes to reduce the global material budget to 0.4% radiation length on the innermost layer.
The experience and lessons learned from construction and operations of this novel detector are
presented. Detector performance and results from 2014 Au+Au data analysis, demonstrating the
STAR capabilities of charm reconstruction, are described.
DOI: https://doi.org/10.22323/1.287.0007
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