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MeV electron acceleration at 1 kHz with <10 mJ laser pulses.

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Area of Science:

Plasma Physics
Laser-Plasma Interactions
Particle Acceleration

Background:

Laser-driven acceleration offers a compact alternative to traditional accelerators.
Achieving high electron energies with low laser pulse energies is a key challenge.

Purpose of the Study:

To demonstrate MeV-scale electron acceleration using low-energy laser pulses.
To investigate electron acceleration in near-critical density Helium (He) and Hydrogen (H2) gas jets.
To characterize electron bunch properties at varying laser pulse energies.

Main Methods:

Utilizing a kHz repetition rate laser system with pulse energies <10 mJ.
Focusing laser pulses onto near-critical density He and H2 gas jets.
Measuring accelerated electron energies and bunch charges.

Main Results:

Electron acceleration to ~0.5 MeV in ~10 fC bunches was achieved with 1.3 mJ pulses in H2.
Increasing laser pulse energy to 10 mJ resulted in ~1 pC bunches with >1 MeV energy for both He and H2.
MeV-scale electron energies were consistently achieved at a 1 kHz repetition rate.

Conclusions:

Low-energy, high-repetition-rate lasers can effectively drive MeV-scale electron acceleration.
Near-critical density gas jets are efficient targets for laser-driven electron acceleration.
This work paves the way for compact, high-repetition-rate electron sources.