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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.
Scientific Reports
|March 21, 2020
Summary
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.
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.
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