1. Ion Detectors and The Proportional Detector
large gas filled capacitor + _
inert gas + _
inert gas
Proportional Detector
cylindrical shape
higher voltage
townsend avalanche
freeing of electrons in a positive feedback cycle
diagram for both circuits A

2. Multiwire Proportional Detectors and The Drift Detector
uses many anode wires closely spaced; sandwiched between a pair of cathode plates
greater resolution, larger scale
Drift Detectors
incorporate drift time of freed ions to achieve greater position resolution
Georges Charpak
(the inventor)

3. A