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Removal of residual linear energy chirp and intrinsic nonlinear energycurvature in the relativistic electron beam from radiofrequency linearaccelerator is of paramount importance for efficient lasing of a high-gainfree-electron laser. Recently, it was theoretically and experimentallydemonstrated that the longitudinal wakefield excited by the electrons itself inthe corrugated structure allows for precise control of the electron beam phasespace. In this Letter, we report the first utilization of a corrugatedstructure as beam linearizer in the operation of a seeded free-electron laserdriven by a 140 MeV linear accelerator, where a gain of ~10,000 overspontaneous emission was achieved at the second harmonic of the 1047 nm seedlaser, and a free-electron laser bandwidth narrowing by about 50% was observed,in good agreement with the theoretical expectations.

Experimental demonstration of longitudinal beam phase space linearizer in a free-electron laser facility by corrugated structures