Accelerator Design
However, when a charged particle is accelerated, it radiates away
energy. At high energies the radiation loss is larger for circular
acceleration than for linear acceleration.
Plus, for a given energy, the radiation loss
is much worse for accelerating electrons than for the heavier protons.
Electrons and positrons can be brought to high energies only in
linear accelerators or in circular ones with large radii.
Can an object accelerate while keeping the same speed?