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Internal micropulse structure of a storage-ring free-electron laser
G De Ninno1, D Nutarelli, D Garzella
1CEA/DSM/DRECAM, Gif-sur-Yvette, France.
Summary
Complex structures within free-electron laser (FEL) micropulses arise from a "hole-burning-like" process. This localized interaction between electron beams and laser pulses in storage rings creates intricate internal FEL dynamics.
Area of Science:
- Physics
- Laser Science
- Particle Accelerators
Background:
- Free-electron lasers (FELs) can exhibit complex longitudinal structures within their pulses.
- Observed phenomena include "spikes" in temporal distributions for LINAC-based oscillators and self-amplified spontaneous emission devices.
Purpose of the Study:
- To investigate the physical mechanism behind complex substructure formation within storage-ring FEL micropulses.
- To understand the "hole-burning-like" process driving these substructures.
Main Methods:
- Analysis of the localized interaction between ultrarelativistic electron beams and laser pulses in a storage ring.
- Utilizing a pass-to-pass tracking code that incorporates system dynamics for interpretation.
- Presenting and interpreting experimental results from the super-ACO FEL.
Main Results:
- The study identifies a "hole-burning-like" process as the cause of complex substructures.
- This process is attributed to the localized nature of electron beam-laser pulse interactions.
- Experimental data from the super-ACO FEL supports this mechanism.
Conclusions:
- The longitudinal structure of storage-ring FELs is significantly influenced by localized interaction dynamics.
- The "hole-burning-like" effect provides a framework for understanding micropulse substructure.
- Pass-to-pass tracking simulations are effective in modeling these complex FEL phenomena.