Status and Performance of New Silicon Stripixel Detector for the PHENIX Experiment at RHIC: Beta Source, Cosmic-rays and Proton Beam at 120 GeV
- Brookhaven National Laboratory (BNL)
- ORNL
- Oak Ridge National Laboratory (ORNL)
- University of Tennessee, Knoxville (UTK)
We are constructing a Silicon Vertex Tracker detector (VTX) for the PHENIX experiment at RHIC. Our main motivation is to enable measurements of heavy flavor production (charm and beauty) in p+p, p+d and A+A collisions. Such data will illuminate the properties of the matter created in high-energy heavy-ion collisions. The measurements also will reveal the distribution of gluons in protons from p+p collisions. The VTX detector consists of four layers of barrel detectors and covers |{eta}|<1.2, and almost a 2{pi} in azimuth. The inner two silicon barrels consist of silicon pixel sensors; their technology accords with that of the ALICE1LHCB sensor-readout hybrid. The outer two barrels are silicon stripixel detectors with a new 'spiral' design, and a single-sided sensor with 2-dimensional (X, U) readout. In this paper, we describe the silicon stripixel detector and discuss its performance, including its response to electrons from a beta source ({sup 90}Sr), muons from cosmic-rays, and a 120 GeV proton beam. The results from the proton beam demonstrate that the principle of two-dimensional position sensitivity based on charge sharing works; the signal-to-noise value is 10.4, the position resolution is 33.6 {micro}m for X-stripixel (35.2 {micro}m for U-stripixel), and the tracking efficiencies in the X- and U-stripixels are, over 98.9 {+-} 0.2%. The stripixel detector within the VTX project is in the pre-production phase.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 951296
- Journal Information:
- Journal of Instrumentation, Vol. 4; ISSN 1748-0221
- Country of Publication:
- United States
- Language:
- English
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