Status and Performance of New Silicon Stripixel Detector for the PHENIX Experiment at RHIC: Beta Source, Cosmic-rays and Proton Beam at 120 GeV

TL;DR

This paper reports on the development and testing of a new silicon stripixel detector for the PHENIX experiment, demonstrating its high resolution, efficiency, and suitability for heavy flavor measurements in high-energy collisions.

Contribution

It introduces a novel spiral design for silicon stripixel detectors and evaluates its performance with beta sources, cosmic rays, and proton beams.

Findings

Charge sharing enables 2D position sensitivity.

Signal-to-noise ratio is 10.4.

Position resolution is approximately 34 micrometers.

Abstract

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 2pi 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 (90Sr), 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 um for X-stripixel (35.2 um 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.