Speaker
Description
Femtosecond electron beams serve as effective tools for investigating ultrafast dynamic processes in matter, providing complementary capabilities to femtosecond laser beams. We propose and demonstrate the feasibility of a scheme combining an undulator with THz modulation to generate isolated few-femtosecond electron bunches. We have developed a theoretical method that incorporates the transport dynamics of low-energy relativistic electrons interacting with the THz modulation field in the undulator and the space charge effects within the bunch itself. The results indicate that the proposed scheme can generate single isolated ultrafast electron bunches with kinetic energy 3 MeV, bunch length about 6 fs (rms) with core charge up to 0.1 pC. We have also evaluated the potential influence of several relevant physical quantities on the final bunch length and arrival time, and provided some scaling relations with respect to the initial bunch charges. The proposed scheme and the developed theoretical model presented may provide useful insights for generating few-femtosecond electron bunches or even shorter attosecond electron bunches in accelerator-based ultrafast electron facilities.
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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