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Title: A MAPS Based Micro-Vertex Detector for the STAR Experiment

Journal Article · · Physics Procedia
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [5];  [2];  [2];  [2]
  1. Univ. of Texas, Austin, TX (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Central China Normal Univ (CCNU), Wuhan (China)
  4. Institut Pluridisciplinaire Hubert Curien (IPHC), Strasbourg (France)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
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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
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

References (5)

Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions 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
  • Dorokhov, A.; Bertolone, G.; Baudot, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 624, Issue 2 https://doi.org/10.1016/j.nima.2010.03.124
journal December 2010
High resistivity CMOS pixel sensors and their application to the STAR PXL detector
  • Dorokhov, A.; Bertolone, G.; Baudot, J.
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journal September 2011
A MAPS based vertex detector for the STAR experiment at RHIC
  • Greiner, L.; Anderssen, E.; Matis, H. S.
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journal September 2011

Cited By (4)

A review of advances in pixel detectors for experiments with high rate and radiation 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
  • Besson, A.; Pérez, A. Pérez; Spiriti, E.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 845 https://doi.org/10.1016/j.nima.2016.04.081
journal February 2017
Pixel detectors ... where do we stand? journal April 2019

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Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Monlithic Active Pixel Sensor
Vertex Detector
Heavy Flavor
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