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Researchers developed a new method to drive GeV-scale plasma accelerators using long laser pulses. This technique enables high-repetition-rate acceleration with advanced laser technology.

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Area of Science:

  • Plasma Physics
  • Laser-driven Acceleration

Background:

  • Plasma accelerators offer a pathway to compact, high-energy particle beams.
  • Conventional methods often require extremely high laser power or short pulses, limiting repetition rates.

Purpose of the Study:

  • To present a novel technique for driving GeV-scale plasma accelerators using long laser pulses.
  • To enable high-repetition-rate operation of plasma accelerators.

Main Methods:

  • Modulating the temporal phase of a long, high-energy laser driver by copropagating with a seeded plasma wave.
  • Compressing the modulated driver using a dispersive optic to generate a pulse train.
  • Utilizing particle-in-cell (PIC) simulations and an analytic model to verify modulation processes.

Main Results:

  • Demonstrated periodic phase modulation of a long laser driver via interaction with a seeded plasma wave.
  • Generated a train of short pulses suitable for resonant plasma acceleration.
  • PIC simulations showed acceleration of electrons to 0.65 GeV using a 1.7 J, 1 ps driver and a 140 mJ, 40 fs seed pulse.

Conclusions:

  • The developed method allows for controlled, linear modulation of long laser pulses.
  • This approach paves the way for high-repetition-rate, GeV-scale plasma accelerators driven by efficient thin-disk lasers.