Lerner wrote: To be more exact, we expect that with higher plasmoid density, msot of the energy of the electron beam willbe absorbed before the elctrosn leave the plasmoid. Andoe erosion is still a major concern as the anode must be kept cool. Cooling is one of the three main engineering challenges.

What are the physical principles that allow the electron beam to be absorbed so well? Is it by shear density that prevents the electrons from leaving the plasmoid? Or is it because the + charge of Boron is 5 times greater than the Deuterium and thus 25 times (squaring law) greater at braking those electrons and converting their energy to bremsstrahlung?