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Subrelativistic Alternating Phase Focusing Dielectric Laser Accelerators.

Payton Broaddus1, Thilo Egenolf2, Dylan S Black1

  • 1Department of Electrical Engineering, Stanford University, 350 Serra Mall, Stanford, California 94305-9505, USA.

Physical Review Letters
|March 8, 2024
PubMed
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This summary is machine-generated.

We developed a silicon electron accelerator using laser fields for acceleration and confinement. This dielectric laser accelerator (DLA) shows significant energy gains and strong electron confinement over extended distances.

Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Electron accelerators are crucial for scientific research and applications.
  • Existing accelerators face limitations in size, energy efficiency, and beam control.
  • Dielectric Laser Accelerators (DLAs) offer a promising alternative using optical near fields.

Purpose of the Study:

  • To demonstrate a silicon-based DLA capable of accelerating and confining electrons.
  • To investigate the effectiveness of alternating phase focusing (APF) in DLAs.
  • To achieve substantial energy gains in subrelativistic electrons using a compact DLA structure.

Main Methods:

  • Designed and tested two silicon pillar DLA structures with varying acceleration gradients (35 and 50 MeV/m).
  • Utilized pulse front tilted laser beams for symmetric pumping.

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  • Incorporated fractional period drift sections to modify synchronous phase for alternating focusing forces.

    • Main Results:

    • Demonstrated DLAs with interaction lengths up to 708 μm.
    • Achieved energy gains up to 23.7±1.07 keV FWHM, a 25% increase from the starting energy.
    • Observed strong electron confinement enabling long interaction lengths.

    Conclusions:

    • Silicon-based DLAs can effectively accelerate and confine electrons over extended distances.
    • APF lattices provide both longitudinal acceleration and transverse focusing.
    • This technology shows potential for significant energy gains in subrelativistic electron acceleration.