Faraday cup collector (cylinder collector)

https://doi.org/10.1351/goldbook.F02326
A hollow collector, open at one end and closed at the other, used to collect beams of ions.
Sources:
Orange Book, 2nd ed., p. 204 [Terms]
PAC, 1991, 63, 1541. (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1553 [Terms] [Paper]