Speaker
Description
The Silicon Vertex Tracker is a central tracker built for the CLAS12 experiment aiming at measuring the momentum and reconstructing the vertices of charged particles emerging from the target. The system is designed to operate at a luminosity of 1035 cm-2s-1 and to have a momentum resolution of 5% for 1 GeV tracks. The tracker is centered inside 5T solenoid magnet and has 33792 channels of Hamamatsu silicon microstrip sensors. To lower the amount of material in the tracking volume to 0.06X0 modules are assembled on the barrel using unique cantilevered geometry. The sensors have graded angle design to minimize dead areas and a readout pitch of 156 μm. Double sided module hosts three daisy-chained sensors on each side with total strip length of 33 cm. There are 512 channels per module read out by four Fermilab Silicon Strip Readout (FSSR2) chips featuring data driven architecture, mounted on a rigid-flex hybrid. We describe the detector and present performance results from tracker commissioning with cosmic muons.
