Speaker
Description
Crilin is an innovative semi-homogeneous electromagnetic calorimeter designed as the baseline solution for the MUSIC detector at the future Muon Collider.
Its architecture features multiple layers of Lead Fluoride (PbF$_2$) crystals, each read out by an array of UV-extended SMD Silicon Photomultipliers (SiPMs).
The detector is engineered to withstand the demanding conditions of the collision environment: it is compact, longitudinally segmentable with adjustable depth depending on the application, fast, and radiation-tolerant.
Crilin’s high-granularity structure, featuring a 13 mm transverse cell size and a 4 X$_0$ layer depth in the Muon Collider configuration, is essential for disentangling the physics signal from the intense beam-induced backgrounds (BIB). Simulations predict that the BIB consists mainly of photons with low average energy, requiring precise timing and fine segmentation to suppress out-of-time background contributions. To address this, Crilin leverages the fast Cherenkov response of PbF$_2$ crystals for accurate time-of-arrival measurements, enabling effective background rejection and supporting full 5D particle flow reconstruction with high jet energy resolution. The detector must operate in a harsh radiation environment, facing up to 10 kGy/year of Total Ionizing Dose (TID) and neutron fluences of 10$^{14}$ n$_{1MeVeq}$/cm$^2$/year. Extensive radiation hardness studies on both the crystals and the SiPMs have validated the chosen design up to these target conditions.
A prototype (Proto-1), composed of two layers of 3$\times$3 crystals, has undergone comprehensive testing and demonstrated a timing resolution better than 50 ps for energy deposits down to 1 GeV. The mechanical layout, front-end electronics, and test beam results of this prototype are discussed in detail.
Ongoing R&D is focused on developing a full-containment prototype comprising five layers of 7$\times$7 crystal matrices. While beam tests of this advanced version are planned for Spring 2026, preliminary results from a smaller-scale prototype, incorporating key mechanical and electronic upgrades, will be presented.
| Position | PhD student |
|---|---|
| Affiliation | INFN Laboratori Nazionali di Frascati |
| Country | Italy |