Channeltron
Channel Electron Multiplier (CEM)
Dispositif multiplicateur d'électrons
Kanalelektronenvervielfacher (KEV)

Channeltron® is a registered trade mark of Photonis – Burle – Galileo.

The channeltron compacts the design of the electron multiplier into a single component shaped like a cornucopia.

Its inside is coated with a thin film of semi-conducting material that has both a high secondary electron emission coefficient, and a high resistance, so that the functions of secondary-emission and voltage-division are merged. When a negative high voltage is applied at the wider input end, and a positive voltage near ground is applied at the narrower output end, the resistive surface forms a continuous dynode.

A particle or a photon striking the funnel-shaped input aperture produces secondary electrons that are accelerated down the channel by the positive bias. Upon striking the interior surface of the channel walls, these electrons then generate further secondary electrons. The resulting avalanche process produces an easily detectable output pulse of charge containing up to 10e8 electrons. At the destination end a separate electrode (anode) collects the multiplied electrons.

Thanks to their low mass and high gain, CEM's are used in many nuclear physics labs and space applications to count electrons and charged particles in pulse mode operation. Typical applications include mass spectrometry, plasma analysis, Auger, electron spectrometers, and leak detectors.

See also • Voir aussi • Siehe auch : Channeltron 4879M & Channel Electron Multiplier Tube

 

57 x 68 mm • 2" 2/10 x 2" 7/10

 

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