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Efficient Bubble Acceleration Using Few-Cycle Laser Pulses: Insights and Simulations

This study explores bubble acceleration mechanisms using few-cycle laser pulses through a series of 3D-PIC simulations. We investigate various parameters, including pulse duration, scaling, and gas density profiles to optimize electron acceleration in plasmas. With a focus on the interaction of laser matter, we present data on bubbles' lifetimes, efficiencies, and propose multistage processes for enhanced acceleration. Our findings demonstrate the potential of few-cycle pulses in achieving optimal bubble dynamics and acceleration efficiencies while highlighting challenges such as density control and electron injection.

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Efficient Bubble Acceleration Using Few-Cycle Laser Pulses: Insights and Simulations

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  1. Max-Planck-Institut für Quantenoptik Bubble Acceleration with few-cycle pulses Michael Geissler, Jörg Schreiber, Florian Grüner and Jürgen Meyer-ter-Vehn

  2. Outline 3D-PIC Simulations of: • few cycle pulses: • Scaling • Density Profile • Closer look on “bubble-electrons” • Experiments (Rutherford, Jena, MPQ…)

  3. Numerical Tool 3D-PIC Code for Ideal Laser Matter Interaction: ILLUMINATION x – Laser Polarization z – Propagation direction y Laser Pulse

  4. 5fs, a=5, w0=5µm, p=8µm

  5. 5fs, a=5

  6. 5fs, a=5, 70MeV e-

  7. 5fs, a=5, 60-80MeV e-

  8. 5fs, a=5, 60-80MeV e-

  9. 5fs, a=5, 60-80MeV e-

  10. 5fs, w0=5µm, p=8µm a=3 a=5 a=10 a=30

  11. 5fs Summary

  12. 5fs Scaling

  13. 5fs, a=5 with Gas denstity profile: Focus position N0 z 200µm 200µm

  14. 5fs, a=5, p=8µm, profile

  15. MPQ: 5fs, a=5, w0=2µm; 20mJ

  16. RAL: 40fs, a=0.767, 390mJ

  17. RAL: 40fs, a=0.767, 390mJ Ne [10201/cm³] Intensity [1019 W/cm²] z [µm] z [µm] Ez [1012V/m] z [µm]

  18. Jena: 80fs, a=3

  19. 80fs, a=3 Ne [10201/cm³] I [1019W/cm²]

  20. Conclusions Few-cycle pulses are most efficent for bubble acceleration (longer pulses become few-cycle during propagation) • Acceleration is limited due: • Rb=w0*a0.25 ~Eacc • Short lifetime of the bubble (~200-400µm) • Precise control of gas density and length is necessary • Multistages: Use a small amount (20-100mJ) in the first stage, but what afterwards? Wakefield? second bubble? How to inject the electron?

  21. 40fs, a=3

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