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    Area of Science:

    • Ultrafast science
    • Quantum optics
    • Electron microscopy

    Background:

    • Pulsed electron beams require temporal control for advanced applications.
    • Terahertz (THz) radiation is used for electron pulse compression but faces limitations at lower frequencies.
    • Generating sub-THz fields for longer electron pulses is challenging due to optical pumping and wavelength limitations.

    Purpose of the Study:

    • To propose and analyze a new method for electron-pulse compression using sub-THz near-fields.
    • To overcome the limitations of traditional THz radiation for compressing picosecond electron pulses.
    • To enable flexible multi-electron manipulation in experiments.

    Main Methods:

    • Utilizing sub-THz fields generated near the dipolar origin, avoiding radiative processes.
    • Analyzing the effectiveness of near-fields for slow electron compression in challenging conditions.
    • Investigating applications within the constraints of electron microscopes.

    Main Results:

    • Demonstrated feasibility of electron-pulse compression using near-fields below 0.1 THz.
    • Achieved electric fields of a few kV/cm at high repetition rates.
    • Showcased the potential for controlling electron pulses in various experimental setups.

    Conclusions:

    • Near-field sub-THz compression offers a viable alternative to traditional THz radiation.
    • This method is suitable for electron microscopes and other experiments requiring precise electron pulse control.
    • The proposed scheme facilitates advanced multi-electron manipulation for analytic and quantum sciences.