A MAPS Based Micro-Vertex Detector for the STAR Experiment
- Univ. of Texas, Austin, TX (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Central China Normal Univ (CCNU), Wuhan (China)
- Institut Pluridisciplinaire Hubert Curien (IPHC), Strasbourg (France)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
For the 2014 heavy ion run of RHIC a new micro-vertex detector called the Heavy Flavor Tracker (HFT) was installed in the STAR experiment. The HFT consists of three detector subsystems with various silicon technologies arranged in 4 approximately concentric cylinders close to the STAR interaction point designed to improve the STAR detector’s vertex resolution and extend its measurement capabilities in the heavy flavor domain. The two innermost HFT layers are placed at radii of 2.8 cm and 8 cm from the beam line. These layers are constructed with 400 high resolution sensors based on CMOS Monolithic Active Pixel Sensor (MAPS) technology arranged in 10-sensor ladders mounted on 10 thin carbon fiber sectors to cover a total silicon area of 0.16 m2. Each sensor of this PiXeL (“PXL”) sub-detector combines a pixel array of 928 rows and 960 columns with a 20.7 μm pixel pitch together with front-end electronics and zero-suppression circuitry in one silicon die providing a sensitive area of ~3.8 cm2. This sensor architecture features 185.6 μs readout time and 170 mW/cm2 power dissipation. This low power dissipation allows the PXL detector to be air-cooled, and with the sensors thinned down to 50 μm results in a global material budget of only 0.4% radiation length per layer. A novel mechanical approach to detector insertion allows us to effectively install and integrate the PXL sub-detector within a 12 hour period during an on-going multi-month data taking period. The detector requirements, architecture and design, as well as the performance after installation, are presented in this paper.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- AC02-05CH11231; FG02-94ER40845
- OSTI ID:
- 1208601
- Journal Information:
- Physics Procedia, Vol. 66, Issue C; ISSN 1875-3892
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions
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journal | August 2005 |
First reticule size MAPS with digital output and integrated zero suppression for the EUDET-JRA1 beam telescope
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journal | November 2010 |
Improved radiation tolerance of MAPS using a depleted epitaxial layer
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journal | December 2010 |
High resistivity CMOS pixel sensors and their application to the STAR PXL detector
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journal | September 2011 |
A MAPS based vertex detector for the STAR experiment at RHIC
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journal | September 2011 |
A review of advances in pixel detectors for experiments with high rate and radiation
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journal | May 2018 |
A review of advances in pixel detectors for experiments with high rate and radiation | text | January 2017 |
From vertex detectors to inner trackers with CMOS pixel sensors
|
journal | February 2017 |
Pixel detectors ... where do we stand?
|
journal | April 2019 |
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