Reconstruction of the three-dimensional bunch profile by tomography technique with RF deflecting cavity

We have developed a method to fully reconstruct the three-dimensional (3D) profile of electron bunches by using an RF deflecting cavity and the computed tomography (CT) technique. The bunches are tilted by the deflecting cavity at zero-phase and projected towards a downstream flag after drifting a certain distance or being transported by a lattice. The acquired images under different deflecting voltages are equivalent to the projections of the bunch at different angles. The electron distribution can be computed by using the reconstructing algorithm of the computed tomography technique. The full procedure and the algorithm are verified with the particle tracking simulations and a proof-of-principle experiment.