3 ms·

i'm confused. why do you need to accelerate electrons? wouldn't a Van De Graaff accelerate electrons to a high rate of speed?

• noobermin 12y ago
  I don't think the idea is to accelerate electrons. It is to produce e+e- pairs.
• al2o3cr 12y ago
  Van de Graff generators are certainly useful for the first 20 MeV or so, but the source photons generated by the electron beam in this case are >500 MeV.