Speaker
Description
Femtosecond science has opened new opportunities for probing atomic and molecular dynamics, while attosecond science further extends capabilities to investigate electron motion with unprecedented temporal resolution. In this work we propose a scheme for generating mega-electron-volt (MeV) relativistic electron microbunch trains via THz modulation. This scheme combines undulator technology with shaped sawtooth THz fields to manipulate the electron beam phase space. We developed an efficient particle tracking model incorporating transport dynamics of MeV relativistic electrons interacting with modulation fields and longitudinal space charge effects. Results show that our proposed scheme produces microbunch trains with ~3 MeV kinetic energy, ~800 as (rms) microbunch length, ~2 fC charge, and tunable ~200 um microbunch spacing. By adjusting upstream/downstream longitudinal dispersion, the bunch structure and microbunch length can be controlled. Our scheme provides useful insights for generating few-fs or attosecond electron bunches.
Funding Agency
This work is supported by the Fundamental Research Funds for the Central Universities (HUST) under Project No. 2021GCRC006 and National Natural Science Foundation of China under Project No. 12275094.
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