Triple GEM detectors for the forward tracker in STAR

Author

Simon, F. ; Kelsey, J. ; Kohl, M. ; Majka, R. ; Plesko, M. ; Underwood, D. ; Sakuma, T. ; Smirnov, N. ; Spinka, H. ; Surrow, B.

Author_Institution

Max-Planck-Inst. fur Phys., Munich

Volume

1

fYear

2007

Firstpage

234

Lastpage

238

Abstract

Future measurements of the flavor-separated spin structure of the proton via parity-violating W boson production at RHIC require an upgrade of the forward tracking system of the STAR detector. This upgrade will allow the reconstruction of the charge sign of electrons and positrons produced from decaying W bosons. A design based on six large area triple GEM disks using GEM foils produced by Tech-Etch Inc. has emerged as a cost-effective solution to provide the necessary tracking precision. We report first results from a beam test of three test detectors using Tech-Etch produced GEM foils and a laser etched two dimensional strip readout. The detectors show good operational stability, high efficiency and a spacial resolution of around 70 mum or better, exceeding the requirements for the forward tracking upgrade. The influence of the angle of incidence of the particles on the spatial resolution of the detectors has also been studied in detail.

Keywords

electron multiplier detectors; gas scintillation detectors; position sensitive particle detectors; GEM foils; RHIC; STAR; W boson decay; electrons; flavor-separated proton spin structure; forward tracking system; gas electron multiplier; parity-violating W boson production; positrons; triple GEM detectors; two-dimensional strip readout; Detectors; Electrons; Etching; Laser beams; Positrons; Production systems; Protons; Spatial resolution; Strips; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2007. NSS '07. IEEE

ISSN

1095-7863

Print_ISBN

978-1-4244-0922-8

Electronic_ISBN

1095-7863

Type

conf

DOI

10.1109/NSSMIC.2007.4436321

Filename

4436321