The High-Current Faraday Cup is a device for measuring high ion beam currents. The setup contains a metal back plate which is electrically insulated towards the housing but connected to a water cooling system by a thermally conductive insulator. Thus, heating power from an incident ion beam of up to 1.5 kW can be dissipated while measuring an electrical current. Furthermore, the Faraday cup features a removable aperture plate as well as a suppressor electrode for suppression of secondary electrons emitted from the cup surfaces at ion impact.
The Faraday cup is mounted on a pneumatic linear push / pull positioner on a DN 160 CF flange. The up and down position is indicated by two relay contacts. The standard travel length between both positions is 100 mm which can be adjusted to the requirements of the customer if necessary. The cup is suitable for ultra high vacuum conditions down to 1e-10 mbar.
The images given in addition to the rendered picture of the complete system show a detailed view of the cup as well as a simulated heat distribution at 1 kW incident beam power.
Faraday Cup Parameters
40 mm or customer-specific
100 mm or customer-specific
recommended suppressor voltage
max. beam power
height above lower flange edge
distance lower flange edge to beam center
beamline attachment flange
DN 160 CF, other flange types available
18 kg (40 lbs)
travel end positions
5-pole M12 connector, 2 relay contacts
max. bakeout temperature
from 1e-10 mbar up to atmospheric pressure
pneumatic push / pull positioner
dry air, 7 bar
one circuit, 1.5 l / min at 3 bar
Scope of Delivery
High-Current Faraday cup readily assembled and mounted onto a DN 160 CF flange
pneumatic linear push / pull positioner
picoampere meter or electrometer for measurement of charged particle current or pulses