Carbon Nanotube production by Electron Rays

[dbmorpher]

Hello, I was doing a little research on nanotubes and came up with an idea.
If we shot a cylindrical beam of electrons a few nanometers apart from each other and then shot a carbon plasma down the center would the carbon atoms be attracted to the electrons and form a nanotube at a sizable scale?

 

[dbmorpher]

This would be done in a vacuum

 

[Graniar]

Even if somehow you will manage to create such cylindrical beam of electrons with equal positive ions inside (which seems practically impossible), recombination energy will be to high and lead to sputtering as ions, atoms and small molecules.