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High-energy ion beams generated with high efficiency using laser-driven 3D microstructures.

Sergei Tochitsky1, Nuno Lemos2, Raspberry Simpson2

  • 1Department of Electrical Engineering, University of California Los Angeles, Los Angeles, CA, 90095, USA. sergei12@ucla.edu.

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|October 30, 2025
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Summary
This summary is machine-generated.

New 3D printed microstructures enable efficient laser-driven ion acceleration, producing high-energy proton beams up to 110 MeV. This breakthrough offers a promising avenue for compact proton accelerators in medicine and science.

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Area of Science:

  • Plasma Physics
  • Laser-Induced Acceleration
  • Materials Science

Background:

  • Laser-driven ion acceleration offers high-current ion beams for science and medicine.
  • Current methods using ultrathin foils achieve high proton energies but face challenges with target survivability and control.

Purpose of the Study:

  • To introduce and evaluate a novel 3D laser-printed microstructure target platform for enhanced laser-driven ion acceleration.
  • To overcome limitations of ultrathin foil targets, specifically prepulse sensitivity and acceleration control.

Main Methods:

  • Utilized two-photon polymerization to create 3D microstructured targets (log-pile and stochastic wire arrangements).
  • Irradiated these microstructures (10-20 μm thick) with a petawatt laser.
  • Investigated proton acceleration via the target normal sheath acceleration (TNSA) mechanism.

Main Results:

  • Microstructured targets demonstrated higher energy and yield proton acceleration compared to thin foil targets.
  • Achieved proton energies up to 110 MeV with a laser-to-proton conversion efficiency of approximately 10%.
  • The microstructures showed relative insensitivity to laser prepulses.

Conclusions:

  • 3D printed microstructures represent a robust and effective platform for laser-driven ion acceleration.
  • These microstructures are promising for developing compact proton accelerators in the 60-200 MeV range.
  • Potential applications include advanced radiotherapy and other scientific fields.