A high speed electron knocks an orbital electron in the atom. This collision creates a vacancy that is filled by an electron from a higher energy level. My question is, what happen with both electrons after the collision? (high speed electron and the knocked electron)
Its a many particle interactive system and electrons are being knocked out from many such atoms from various shells-
they can be caught by some other atoms if a suitable place is available in their arrangements or
get out loosing their energies by collision /radiation and transforming to mainly thermal energies.
The efficiency is at a level that only 1% of the total energy input gets back as X-rays.
The Tube target is to be cooled continuously by water otherwise the target can melt so a lot of energy of electrons convert to heat and electromagnetic radiation.