General Electric discovered synchrotron radiation when ?
However within a storage ring the acceleration is highly relitivistic , and can be obtained as follows : formula_13 where " v " is the circular velocity , " r " is the radius of the circular accelerator , " m " is the rest mass of the charged particle , " p " is the momentum , " τ " is the Proper time ( t / γ ) , and " γ " is the Lorentz factor .