Implementation and Qualification of the FARCOS Frontend Electronics

FARCOS (Femtoscope ARray for Correlation and Spectroscopy) is a novel telescope array that features high angular and energy resolution being built to reconstruct the particle’s momentum at high precision and be capable of performing correlation measurements of LCPs and of LCPS and IMFs. Each telescope features an active area of 6.4 × 6.4 cm2 and is composed of three detection stages. The first ΔE stages are DCcoupled Double-Sided Silicon Strip Detectors (DSSSDs), 300 μm thick and 1500 μm thick, featuring 32 × 32 orthogonal strips. The third stage, acting as calorimeter, is composed of four truncated pyramids of CsI(Tl) crystals with an absorption length of 6 cm. The final system will be a modular assembly of 20 telescopes for a total of 2640 readout channels. A dedicated versatile multichannel CMOS front-end with selectable full-scale dynamics from 90 MeV up to 2 GeV has been developed for the readout of all detector’s signals with an energy resolution of the order of 10 keV FWHM and a power budget of about 10 mW/channel (ASIC only). A dedicated frontend board houses the ASICs and the differential line-drivers to drive the several-meter long connections towards the digitizing stage. The first batch of 60 frontend motherboard has been mounted and qualified with impressive results in terms of yield. The contribution focuses on the designed frontend system and on the results of the qualification of the first batch of 60 frontend motherboard equipping the FARCOS telescopes.