The PHENIX Hadron Blind Detector

Journal Article · Tue Mar 10 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3120145· OSTI ID:21289639

Durham, J M ^[1]

---

1. Dept. of Physics and Astronomy, Stony Brook University Stony Brook, NY 11780-3800 (United States)

Dielectron measurements by the PHENIX Experiment at RHIC are limited by the combinatorial background from electrons and positrons which are not produced in the same pair. The Hadron Blind Detector will allow a substantial reduction of this background by correctly identifying dielectrons from photon conversions and pion Dalitz decays which dominate the signal in the low mass region of the spectrum. Triple GEM stacks, with a CsI photocathode deposited on the uppermost GEM, detect Cherenkov light produced by electrons in a CF{sub 4} radiator. The transparency of CF{sub 4}, high quantum efficiency of CsI in the UV, and absence of a window between the gas radiator and the GEMs allow a large photoelectron yield, while minimizing the hadron signal. Results from the HBD in RHIC's Run-7 and preparations for upcoming runs are discussed.

• OSTI ID: 21289639
• Journal Information: AIP Conference Proceedings, Vol. 1099, Issue 1; Conference: CAARI 2008: 12. international conference on application of accelerators in research and industry, Fort Worth, TX (United States), 10-15 Aug 2008; Other Information: DOI: 10.1063/1.3120145; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BROOKHAVEN RHIC
CARBON TETRAFLUORIDE
CESIUM IODIDES
CHERENKOV COUNTERS
ELECTRON MULTIPLIERS
ELECTRONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PHOTOCATHODES
PHOTOELECTRON SPECTROSCOPY
PIONS
POSITRONS
QUANTUM EFFICIENCY
RADIATORS