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An electron beam microbunched on the optical wavelength scale of ഠ2.5 mm by an inverse free electron laser accelerator was observed. The optimum bunching was achieved for a 1% energy modulation of a 32 MeV electron beam with 0.5 GW CO 2 laser power. The microbunching process was investigated by measuring the coherent transition radiation produced by the energy modulated electron beam. A quadratic dependence of the transition radiation signal on the electron beam charge was observed. The observed shortest wavelength of coherent transition radiation is less than 2.5 mm. The debunching process of the microbunched electron beam was experimentally investigated. [S0031-9007(98)06085-2]

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Electron beam bunching in the optical wavelength was observed experimentally for the first time at the Bmkhaven Accelerator Test Facility(ATF) using the Inverse Free Electron-) accelerator-The micro-bunched electron beam has been studied by measuring the coherent transition radiation (CTR). We have experimentally observed a quadratic dependency of the CTR signal with the charge of the electron beam and the observation distance.