The forward GEM tracker of STAR at RHIC

F. Simon, J. Balewski, R. Fatemi, D. Hasell, J. Kelsey, R. Majka, B. Page, M. Plesko, D. Underwood, N. Smirnov, J. Sowinski, H. Spinka, B. Surrow, G. Visser

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The STAR experiment at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) is in the process of designing and constructing a forward tracking system based on triple GEM technology. This upgrade is necessary to give STAR the capability to reconstruct and identify the charge sign of W bosons over an extended rapidity range through their leptonic decay mode into an electron (positron) and a neutrino. This will allow a detailed study of the flavor-separated spin structure of the proton in polarized p+ p collisions uniquely available at RIDC. The Forward GEM Tracker FGT will consist of six triple GEM disks with an outer radius of ̃V39 cm and an inner radius of ̃10.5 cm, arranged along the beam pipe, covering the pseudo-rapidity range from 1.0 to 2.0 over a wide range of collision vertices. The GEM foils will be produced by Tech-Etch, Inc. Beam tests with test detectors using 10 cm × 10 cm Tech-Etch GEM foils and a two dimensional orthogonal strip readout have demonstrated a spatial resolution of 70μm or better and high efficiency.

Original languageEnglish
Title of host publication2008 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2008
Number of pages3
StatePublished - 2008
Event2008 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2008 - Dresden, Germany
Duration: Oct 19 2008Oct 25 2008

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863


Conference2008 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2008

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging


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