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Active Plasma Lensing for Relativistic Laser-Plasma-Accelerated Electron Beams.

J van Tilborg1, S Steinke1, C G R Geddes1

  • 1Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA.

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A novel discharge-capillary plasma lens focuses electron beams from laser-plasma accelerators (LPAs). This technology achieves strong, tunable focusing, crucial for compact accelerator applications.

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Area of Science:

  • Plasma physics
  • Accelerator physics
  • Laser-plasma interactions

Background:

  • Compact, tunable, radially symmetric focusing of electrons is critical for laser-plasma accelerator (LPA) applications.
  • Existing focusing methods may not meet the requirements for compactness and tunability needed in advanced LPA applications.

Purpose of the Study:

  • To demonstrate the effectiveness of a discharge-capillary active plasma lens for focusing electron beams from LPAs.
  • To characterize the focusing performance, including tunable field gradients and focal lengths.

Main Methods:

  • Experimental demonstration using a discharge-capillary active plasma lens.
  • Focusing of 100-MeV-level LPA electron beams.
  • Measurement of tunable field gradients exceeding 3000 T/m.

Main Results:

  • Successful focusing of LPA electron beams was achieved.
  • The plasma lens provided tunable field gradients over 3000 T/m.
  • Achieved cm-scale focal lengths for GeV-level beam energies, maintaining compact accelerator footprints.
  • Excellent agreement between experimental results and simulations was observed across various lens strengths.

Conclusions:

  • The discharge-capillary active plasma lens is a viable technology for focusing LPA electron beams.
  • This lens enables compact and tunable focusing, essential for advancing LPA applications.
  • The technology supports the development of compact electron beams and light sources derived from LPAs.