Electron Beam Gun: Measures electric fields, heavy particle velocities and electron collision cross-sections

The electron beam gun accelerates electrons to energies adjustable between 600 and 30,000-V.  By shooting the beam through a gas or plasma plume, heavy particle velocities and electron collision cross-sections can be inferred. The gun can also be used to measure electric fields in a discharge by observing the deflection of the electron beam of known energy.