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

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ion detectors and the proportional detector
Ion Detector

large gas filled capacitor

Proportional Detector

cylindrical shape

higher voltage

townsend avalanche

freeing of electrons in a positive feedback cycle

A

inert gas

_

+

inert gas

+

_

Ion Detectors and TheProportional Detector

diagram for both circuits

multiwire proportional detectors and the drift detector
Drift Detectors

incorporate drift time of freed ions to achieve greater position resolution

Multiwire Proportional Detector

uses many anode wires closely spaced; sandwiched between a pair of cathode plates

greater resolution, larger scale

Georges Charpak

(the inventor)

Multiwire Proportional Detectors and The Drift Detector