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:
“I write mainly for the kindly race of women. I am their sister, and in no way exempt from their sorrowful lot. I have drank [sic] the cup of their limitations to the dregs, and if my experience can help any sad or doubtful woman to outleap her own shadow, and to stand bravely out in the sunshine to meet her destiny, whatever it may be, I shall have done well; I have not written this book in vain.”
—Amelia E. Barr (1831–1919)