Tests of AC-coupled silicon strip detectors with a proton beam and a beta source

Abstract

We fabricated an AC-coupled single-sided silicon strip sensor on 5-in. 380 mum-thick wafer and its active area is 3.2times3.2 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . It has 64 implanted and readout strips with a strip pitch of 500 mum. The sensors were held at room temperature with a bias of 46 V. Two silicon strip sensors were mounted perpendicularly one another to get two-dimensional position information with a 5 mm space gap . Two low noise analog ASICs, VA1 chips, were used for signal readout of the strip sensors. The assembly of the sensors and readout electronics was placed housed in an Al light-tight box. A CsI(Tl) scintillation crystal and a 2-in. photomultiplier tube were used to trigger signal events. The data acquisition system was based on a 64 MHz FADC and control softwares for the PC-Linux platform. Imaging tests were performed by using a Pb phantom with a <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">90</sup> Sr radioactive source and a 45 MeV proton beam, respectively. Results of the signal-to-noise ratio measurement and phantom images are presented.