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
Famous quotes containing the words time, projection and/or chamber:
“Time past and time future
What might have been and what has been
Point to one end, which is always present.”
—T.S. (Thomas Stearns)
“In the case of our main stock of well-worn predicates, I submit that the judgment of projectibility has derived from the habitual projection, rather than the habitual projection from the judgment of projectibility. The reason why only the right predicates happen so luckily to have become well entrenched is just that the well entrenched predicates have thereby become the right ones.”
—Nelson Goodman (b. 1906)
“A snake, with mottles rare,
Surveyed my chamber floor,
In feature as the worm before,
But ringed with power.”
—Emily Dickinson (1830–1886)