Kimball Physics designs and manufactures two types of particle detectors: Faraday cups which collect charged particles for current measurement, and phosphor screens which emit light when bombarded by charged particles for visual real-time observation.
The basic Faraday cups are stand alone units with no moving parts and are intended to be mounted in the vacuum system. A number of different types of mechanically or pneumatically actuated Faraday cups are available; most of these mount directly on the housing of electron guns, for direct sampling of the beam. Faraday cup options include: a phosphor screen around entrance aperture, user-changeable apertures, energy analyzing grids, biased cups (collector cup floated away from ground), water cooling, or an array of cups.
Phosphor screens are made of high luminosity P-22 phosphor (ZnS:Ag). The screens are sensitive to electrons starting at approximately 500 eV with a threshold of 1 x 120-7 A/cm2. UHV screens and rugged screens are available.