Faradaycup
A Faraday cup is an instrument for measuring the current of charged particles by collecting them in a conductive container and routing the resulting charge to an electrometer or current-measuring amplifier. It is widely used in vacuum systems, particle accelerators, ion beam analysis and mass spectrometry as a direct and absolute method of determining particle flux or beam current.
The operating principle is simple: incident charged particles deposit their charge on a collector electrode that
Typical Faraday cups are constructed from metals such as stainless steel or copper and may be single
Advantages of Faraday cups are their simplicity, robustness and traceability to fundamental charge measurement. Limitations include