<正>The X-ray source based on Thomson scattering of ultrashort laser pulse with a relativistic electron beam is a means of generating a tunable,narrow bandwidth and ultrashort pulse of hard X-rays.Such a sub-picosecond hard X-ray source is proposed at Tsinghua University,and a preliminary experiment with a 16 MeV Backward Traveling electron linac and a 1.5 J,6 ns Q-switched Nd:YAG laser is carried out first.A 6 ns pulse X-ray with a peak energy of 4.6 keV and an intensity of 1.7×10~4 per pulse is generated successfully in the experiment.The experimental setup,result and discussion are reported in this paper.
