Geometry Optimization of an All-Silicon Tracker for the Electron-Ion Collider *

The Electron-Ion Collider (EIC) is a planned facility that will probe collisions between electrons and protons/ions over a large kinematical range to study Quantum Chromodynamics. This state-of-the-art machine requires a robust tracking system to perform high-precision vertexing and momentum measurements. A pixelated semiconductor detector is one such system, and an all-silicon tracker concept with a barrel and disks to do tracking at mid-rapidity and at forward/backward rapidities respectively, has been implemented in a GEANT4-based Monte-Carlo detector simulation software, Fun4All. Simulations were carried out with 3.0 T and 1.4 T solenoidal maps. Specific areas of interest in the geometry of an all-Si detector concept are the momentum resolution of the detector in the forward region and the vertexing capabilities of the detector. This poster describes studies to optimize the detector performance. Increasing the number of disks above 5 eliminates some acceptance gaps, but at the cost of decreasing momentum resolution by about 10%. Additionally, we study the detector performance when increasing the number of detector layers close to the interaction point. Preliminary results show that the momentum resolution does not significantly change while the transverse distance of closest approach (DCA) resolution shows a potential increase in vertexing at low rapidity, especially at high particle momentum.