👉 The CMS (Compact Muon Solenoid) fluid is a crucial component of the Large Hadron Collider's (LHC) particle detection system, specifically designed to absorb and track the trajectories of high-energy particles produced in collisions. This fluid, a mixture of deionized water and a small amount of a liquid scintillator, is filled around the inner surface of the solenoid, a large magnetic field generator. When charged particles pass through this fluid, they ionize the water molecules, causing them to emit light. This luminescence is then detected by photomultiplier tubes, allowing physicists to reconstruct the particles' paths and measure their properties, such as energy and momentum. The fluid's high density and excellent light-gathering capabilities make it ideal for capturing the fleeting signals from these collisions, contributing significantly to discoveries in particle physics.