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    This study demonstrates laser plasma wakefield acceleration using mid-infrared laser pulses, achieving electron acceleration up to 12 MeV. This method shows increased electron charge compared to near-infrared pulses.

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    Area of Science:

    • Plasma Physics
    • Laser-driven particle acceleration

    Background:

    • Laser plasma wakefield acceleration (LPWA) is a promising technique for compact particle accelerators.
    • Mid-infrared (IR) lasers offer unique interaction regimes with plasmas.

    Purpose of the Study:

    • To investigate LPWA using ultrashort mid-IR laser pulses.
    • To explore near- and above-critical density plasma interactions.
    • To characterize relativistic electron acceleration and beam properties.

    Main Methods:

    • Utilized ultrashort mid-IR laser pulses (3.9 μm, 100 fs, 0.25 TW).
    • Employed moderate-density gas jets for plasma generation.
    • Conducted experiments with varying jet widths to study relativistic self-focusing.
    • Performed particle-in-cell simulations and time-resolved imaging for analysis.

    Main Results:

    • Achieved relativistic electron acceleration up to ~12 MeV.
    • Observed acceleration contingent on jet width exceeding the relativistic self-focusing threshold.
    • Detailed scaling trends in beam profiles, charge, and spectra.
    • Reported significant increases in accelerated charge compared to near-IR pulses.

    Conclusions:

    • Mid-IR laser-driven LPWA is feasible and effective for electron acceleration.
    • The technique enables enhanced electron charge production in specific plasma conditions.
    • Results pave the way for novel applications in compact accelerators.