Speaker
Description
A novel background identification detector is under development for the MEG II experiment, aiming for further sensitivity improvement in the $\mu\to e\gamma$ search. This detector needs to detect MIP positrons in a high-intensity low-momentum muon beam up to $10^8~\mu/\text{s}$. Hence, ultra-low material budget and high rate capability are required.
The detector under development is a new type of Resistive Plate Chamber (RPC) with thin-film resistive electrodes based on Diamond-Like Carbon coating instead of glasses which are widely used in the conventional RPCs. A high efficiency (>90%) and a good timing resolution (~250 ps) for MIP particles are shown to be achievable with a multi-layer configuration. The performance measured with prototypes including the high rate capability for low momentum muon beam will be presented.
