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Related Experiment Video

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Characterisation of microbunching instability with 2D Fourier analysis.

A D Brynes1,2,3, I Akkermans4, E Allaria5

  • 1ASTeC, STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, Cheshire, United Kingdom. alexander.brynes@stfc.ac.uk.

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A new 2D Fourier analysis method reveals hidden modulations in free-electron lasers (FELs). This technique aids in understanding and mitigating microbunching instability for optimal FEL performance.

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Area of Science:

  • * Physics
  • * Accelerator Science
  • * Laser Technology

Background:

  • * High-brightness free-electron lasers (FELs) are crucial for advanced research.
  • * Microbunching instability degrades FEL performance by affecting electron beam properties.
  • * Current analysis methods have limitations in fully characterizing beam modulations.

Purpose of the Study:

  • * Introduce a novel 2D Fourier analysis for comprehensive electron beam phase space study.
  • * Investigate the plasma oscillation between energy and density modulations.
  • * Analyze the damping of microbunching instability using a laser heater.

Main Methods:

  • * Application of 2D Fourier analysis to the full bunch longitudinal phase space.
  • * Simultaneous study of modulations in energy and density planes.
  • * Experimental comparison of instability development under different compression schemes.

Main Results:

  • * The 2D method reveals modulations in folded phase space, previously undetected.
  • * Plasma oscillations between energy and density modulations are identified.
  • * Laser heater use mitigates modulation amplitude and red-shifts microbunching frequency with increased energy spread.

Conclusions:

  • * 2D Fourier analysis offers a superior method for studying electron beam dynamics in FELs.
  • * The findings provide critical insights into controlling microbunching instability.
  • * This work presents the first systematic experimental comparison of instability development across various compression schemes.