Microwiggler free electron laser experiment

Summary Form only given, as follows. In free electron laser (FEL) operation, wigglers with small periodicities reduce the electron beam energy required for producing high-frequency radiation. Microwigglers with periodicities of less than 1 cm, combined with the high-quality beams generated by photoelectric injectors, may result in compact and efficient short-wavelength FELs. The authors have designed, constructed, and tested novel microwiggler structures with periodicities of 2.4 to 8 mm in which the magnetic field in each half-period is independently adjustable. The experimentally demonstrated tunability of field amplitudes provides versatile means for enhancing the FEL performance. A microwiggler FEL driven by a 300-kV Marx generator and a thermionic electron gun have been investigated.<>