Time Projection Chamber
The ALICE Time Projection Chamber (TPC) is the main particle tracking device in ALICE. Charged particles crossing the gas of the TPC ionize the gas atoms along their path, liberating electrons that drift towards the end plates of the detector. An avalanche effect in the vicinity of the anode wires strung in the readout, will give the necessary signal amplification. The positive ions created in the avalanche will induce a positive current signal on the pad plane. The readout is done by the 557 568 pads that form the cathode plane of the multi-wire proportional chambers (MWPC) located at the end plates. This gives the r and coordinates. The last coordinate, z, is given by the drift time.
Read more about this topic: A Large Ion Collider Experiment
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