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Area of Science:

  • Plasma physics
  • Accelerator physics
  • Particle beam optics

Background:

  • Active plasma lenses provide strong focusing gradients for charged particle beams.
  • Aberrations in plasma lenses, caused by temperature nonuniformities, degrade beam quality.

Purpose of the Study:

  • To directly measure aberrations in active plasma lenses.
  • To investigate methods for suppressing these aberrations.
  • To demonstrate emittance preservation using optimized plasma lens conditions.

Main Methods:

  • Direct measurement of plasma lens aberrations.
  • Comparison of focusing performance using different gas species (helium vs. argon).
  • Electron beam emittance measurements.

Main Results:

  • The study presents the first direct measurement of plasma lens aberrations, consistent with theoretical predictions.
  • Switching from helium to argon gas successfully suppressed plasma lens aberrations.
  • Emittance preservation of an electron beam was demonstrated using an argon-filled active plasma lens.

Conclusions:

  • Radially nonuniform plasma temperature profiles cause significant aberrations in active plasma lenses.
  • Using a heavier gas species like argon effectively mitigates these aberrations.
  • Argon-filled active plasma lenses are a viable technology for preserving beam quality in advanced accelerator applications.