A new large-area Micromegas detector and its readout electronics for AMBER experiment at CERN

As part of the AMBER (NA66) upgrade program, we have designed and built a resistive bulk Micromegas (MM) detector with a total active area of 1.0 x 0.5 𝑚2 per module, intended to replace selected Multi-Wire Proportional Chambers in the spectrometer. The detector comprises three independent side-by-side modules; each module hosts two readout planes in a face-to-face configuration sharing a central cathode, enabling XUV tracking. For the lateral modules, a uniform Diamond-Like Carbon (DLC) resistive layer was adopted to mitigate discharge probability while preserving efficiency at high gas gain. The first module-currently the largest operating resistive bulk MM of its kind was completed in October 2024 and is under test. Meanwhile, considering the need for new triggerless compatible readout electronics, we are developing a 64-channel mixed- signal front-end ASIC(Torino Readout for AMBER - ToRA), optimized for time and energy measurements. This article review detector design, production, first operation, and ongoing development of the ToRA-based readout chain.