Figure 2
An electron passes through a bending magnet and its narrow synchrotron `cone' of width ∼2/γ sweeps through a point-like detector. (a) When the detection starts, the electron–detector line of sight is at an angle θ = θM ≃ 1/γ from the longitudinal direction. Then (b) θ decreases to zero, and afterwards (c) it increases again to θM. |