Faraday cup

Faraday cup
	Schematic diagram of a Faraday cup
Uses	Charged particle detector
Related items	Electron multiplier; Microchannel plate detector; Daly detector

A Faraday cup is a metal (conductive) cup designed to catch charged particles in vacuum. The resulting current can be measured and used to determine the number of ions or electrons hitting the cup.^[1] The Faraday cup was named after Michael Faraday who first theorized ions around 1830.

Examples of devices which use Faraday cups include space probes (Voyager 1, & 2, Parker Solar Probe, etc.) and mass spectrometers.

^ Brown, K. L.; G. W. Tautfest (September 1956). "Faraday-Cup Monitors for High-Energy Electron Beams" (PDF). Review of Scientific Instruments. 27 (9): 696–702. Bibcode:1956RScI...27..696B. doi:10.1063/1.1715674. Retrieved 2007-09-13.

[1.1715674-1] Brown, K. L.; G. W. Tautfest (September 1956). "Faraday-Cup Monitors for High-Energy Electron Beams" (PDF). Review of Scientific Instruments. 27 (9): 696–702. Bibcode:1956RScI...27..696B. doi:10.1063/1.1715674. Retrieved 2007-09-13.

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