A multiwire proportional chamber is a proportional counter: parallel anode wires between cathodes in a gas. Charged particle ionization frees Electrons; an electric field drives them toward wires, triggering an electron avalanche read by electronic amplifiers.[ref]
Opposite polarities identify the avalanche wire. Positive ion motion dominates integrated signal; detection precedes complete collection. Calibrated Electron travel times enable drift chambers.[ref]
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