Faraday Cup

Categories: Beam diagnostics Beam current measurement
Manufacturer: DREEBIT GmbH
The Faraday cup is a device for measuring charged particle beam currents and charges in real-time.


The Faraday Cup is a device for measuring charged particle beam currents and charges in real-time. The measurement electrode is electrically insulated inside the cup housing and has to be connected to an electrical vacuum feedthrough by a Kapton insulated wire. The cup housing itself can also be mounted onto an electrically insulating holder in case the current on the housing is supposed to be recorded. Furthermore, the cup setup includes a suppressor electrode to compensate secondary electron emission from the cup surfaces. The cup is made exclusively from materials suitable for ultra high vacuum conditions down to 1e-10 mbar.


Faraday Cup Parameters
aperture diameter 1 mm, 2 mm, 5 mm, or customer-specific
recommended supressor voltage 50 V
max. beam power without additional cooling 20 mW
General Parameters
dimensions (length x width x height) 34 mm x 34 mm x 55 mm
max. bakeout temperatrue 150°C
Infrastructural Requirements
vacuum conditions during operation suitable from 1e-10 mbar up to atmospheric pressure

Scope of Delivery

  • Faraday cup for low-current measurement incl. screws for wire attachment

Optional Equipment

  • linear vacuum feedthrough with manual or motor-driven positioning system
  • vacuum chamber
  • electrical feedthroughs and connection of cup inside a vacuum chamber via Kapton insulated wire
  • picoampere meter or electrometer for measurement of charged particle current or pulses
  • control and measurement hardware and software


Reference Facilities

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