High quality electron beams with flat distributions in both energy andcurrent are critical for many accelerator-based scientific facilities such asfree-electron lasers and MeV ultrafast electron diffraction and microscopes. Inthis Letter we report on using corrugated structures to compensate for the beamnonlinear energy chirp imprinted by the curvature of the radio-frequency field,leading to a significant reduction in beam energy spread. By using a pair ofcorrugated structures with orthogonal orientations, we show that the quadrupolewake fields which otherwise increase beam emittance can be effectivelycanceled. This work also extends the applications of corrugated structures tothe low beam charge (a few pC) and low beam energy (a few MeV) regime and mayhave a strong impact in many accelerator-based facilities.
展开▼
