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
Famous quotes containing the word cup:
“In poorer lands
No one touches the water of life.
It has no taste
And though it refreshes absolutely
It is a cup that must also pass
Until everybody
Gets some advantage....”
—John Ashbery (b. 1927)
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