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. The Faraday cup is named after Michael Faraday who first theorized ions around 1830.
Read more about Faraday Cup: How It Works, Error Sources
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“It is surely easier to confess a murder over a cup of coffee than in front of a jury.”
—Friedrich Dürrenmatt (1921–1990)
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