The μ-RWELL for future HEP challenges

The challenges posed by the forthcoming High-Energy Physics experiments require advanced particle detection technologies that are industrially scalable. The μ-RWELL, a single-amplification stage resistive MPGD utilizing sequential build-up (SBU) technology, addresses these needs. This paper reviews the main characteristics of the detector, the design of high-rate layouts, and their testing at INFN-LNF. It provides a detailed description of the detector construction processes at ELTOS and the CERN MPT Workshop. The findings highlight the industrial feasibility of detector construction, offering benefits in production time and cost. A significant focus is on the production of large DLC foils, which are essential for the detector’s amplification stage. This was facilitated by the acquisition of a DC-magnetron sputtering machine through a CERN-INFN collaboration. Detailed test results using an X-ray gun at LNF and particle beams at the CERN North Area clearly show that the detector achieves a gas gain of 104 and a rate capability greater than 1 MHz/cm2, while the efficiency of the optimized high-rate layout is about 98%. Preliminary outcomes from the 2023 co-production pilot test show a production yield larger than 90%. This successful technology transfer marks a step towards building larger detectors for future HEP challenges.