Speaker
Description
The Barrel Imaging Calorimeter (BIC) is a hybrid detector for the electron-Proton/Ion Collider (ePIC) experiment at the Electron-Ion Collider (EIC). The BIC is a high-performance lead-scintillating-fiber-based sampling calorimeter with layers of AstroPix sensors, an inexpensive, low-power HV-CMOS silicon sensor, for shower profiling. The detector design fulfills stringent ECAL requirements in the barrel region from the EIC yellow report. Some of the important requirements are 10$^4$ $\pi$ suppression at low momenta, decent energy resolution for photon energy reconstruction, fine granularity for good $\pi^0$-$\gamma$ separation up to 10 GeV, and measurement of low energy photons down to 100 MeV with range exceeding 10 GeV.
With this submission, an overview of the Barrel Imaging Calorimeter design will be presented with emphasis on the imaging layers and AstroPix sensors. The BIC, with a coverage of (-1.71 $< \eta <$ 1.31), consists of 48 trapezoidal sectors built of layers of scintillating fibers embedded in lead and six slots for imaging layers. Each imaging layer consists of several AstroPix staves subdivided into modules. The BIC will incorporate a total of about 140 m$^2$ of AstroPix sensors. The AstroPix sensor was inspired by ATLASPix3 and MuPix and is being designed using a 180 nm CMOS process for future gamma-ray astrophysics missions. The AstroPix sensors have the advantage of a fully monolithic structure, low manufacturing cost, low material budget , fast charge collection, and high radiation tolerance with low-power operation, large sensitive area, low noise, wide dynamic range, and good energy/spatial resolution. The presentation will also include a brief discussion on measured AstroPix performance.
