In cathode ray tube electrons hit a fluorescent screen. Then photons are emitted. But where did electrons go after they hit the screen?
The way that these cathode ray tubes work is through the attraction of negative electrons to the positive anode. The focussing anode accelerator accelerates the electrons to the phosphor in which the incident energy is absorbed and then transferred to the photons which emit the beams of light.
The electrons themselves are absorbed into the phosphor screen. Residual electrons scatter randomly and eventually end up but collected again by the anode and sent back to the circuits electrical ground.