DEVELOPMENT OF HIGH-BRIGHTNESS FEMTOSECOND X-RAY SOURCE

A high-brightness femtosecond X-ray source, based on Thomson scattering of a low-emittance electron beam with a femtosecond pulse laser at a 90-degree interaction configuration, has been developed and will be expected for the study of ultra-fast structural dynamics of materials. The electron beam was generated by a laser-driven photocathode RF gun and accelerated up to 14MeV with a linac. A 270fs pulse X-rays with a peak energy of 2.3keV were achieved experimentally in the interaction of a 3ps electron bunch with a 100fs Ti:Sapphire laser light. The intensity of the X-rays was obtained to be 1.4x104/pulse under the experimental conditions of a 0.5nC electron bunch and a 100mJ laser pulse energy. The stability of the X-ray intensity was obtained to be 25%(rms).