Speakers
Description
The challenges imposed by the high-rate and high-dose environment of future colliders will push the boundaries of rate capability, tracking and resolution requirements of future gaseous detectors. In this scope, a novel single stage Micro-Pattern-Gaseous-Detector (MPGD) layout developed by some of the authors, the u-RWELL, has achieved gas gains of ∼2 × 104, spatial resolution of ∼100 μm, and a time resolution of around 5–6 ns. The μ-RWELL consists of a conical GEM-style foil coupled to a Diamond-Like-Carbon (DLC) substrate for charge clearing and spark protection. To allow for fast charged carrier evacuation through the DLC layer, a high-density grounding layouts has been developed, ensuring stable operation well beyond particle rates of several Mhz/cm2.
To fulfil the LHCb Upgrade II timing and rate requirement, the G-RWELL, a new hybrid MPGD, was developed. The G-RWELL consists of a Gas Electron Multiplier (GEM) pre-amplification stage coupled to a μ-RWELL detector: this configuration allows for gas gains of 105 and improved time resolution (~3.8 ns).
Multiple G-RWELL prototypes were built and tested, exploring the full space parameters of drift and transfer gaps and field configurations. An X-Rays test campaign carried out at Laboratori Nazionali di Frascati showcased improved gain over the u-RWELL layout while mantaining stable operation. Furthermore, multiple Test Beam campaigns have been carried out at CERN-PS T10 line. Here the prototypes were equipped with a dedicated front-end chip, the FAst TIming Chip 3 (FATIC3), comparing detectors with and active area of10×10, 25×30, and 25×60 cm². Results confirmed improved timing performance, time resolution and efficiency.
This talk discusses the G-RWELL layout as a promising new technology for future detectors, combining stable operation at high gas gain, fast timing performance, and high-rate capability.