The detector consists of two main components: the central part composed of detectors dedicated to the study of hadronic signals and electrons, and the forward muon spectrometer dedicated to the study of quarkonia behaviour in dense matter.
The central part is embedded in a large solenoid magnet with a weak field (full current of 6000 amps and magnetic field of 670 millitesla). The innermost part of the detector is the tracking system, which consists of the inner tracking system (ITS) and the outer tracking system (TPC).
TPC is the principal component of ALICE and it's a time projection chamber. A cylindrical device filled with gas and incorporating uniform electric and magnetic fields, a TPC is ideal for separating, tracking, and identifying thousands of charged particles in a dense environment — such as the thousands of particles produced in an energetic heavy-nuclei collision. It is the main detector in many high-energy physics experiments.