The description of the steps of the Q&A test and detector module assembly of the CBM-STS

Abstract

The Silicon Tracking System (STS) is the core detector system of the Compressed Baryonic Matter (CBM) experiment at FAIR (Facility for Antiproton and Ion Research). The CBM will study matter at the highest baryonic densities in collisions of nuclear beams with a stationary target. The expected long latency for identification and the changing signature of the events drive us to use self-triggered streaming readout. The CBM data collection will be based on time-stamped detector data into a compute farm. Event reconstruction and physics analysis are performed online at up to 10 MHz collision rates. In the presented work, we will discuss step-by-step how the CBM-STS detector components are rigorously selected and prepared for assembly. It starts with carefully testing the readout ASICs. The various parameters are recorded to select the chip. The next step is to test the micro cable’s TAB (Tape Automated Bonding) bonding quality on the ASIC. Later, the 16-chip cables are bonded to the silicon strip sensor. All test results are stored and available for later use in a specially designed database using custom software applied to each step in the assembly process. After assembly of 1/3 of the modules (896), we will overview the acquired experience.