Speakers
Description
We investigate the feasibility of extending the optical klystron (OK) concept into the terahertz (THz) regime, where strong radiation slippage and diffraction critically challenge efficient free-electron laser (FEL) operation. Numerical studies were performed for resonant wavelengths of 10, 30, and 100 µm using beam parameters relevant to the planned DALI facility. The results indicate that long wavelengths exhibit rapid energy growth but experience substantial temporal broadening due to slippage, while shorter wavelengths require large dispersive strengths to achieve adequate microbunching. Harmonic bunching is shown to be a viable method for reducing the required R56 at shorter wavelengths.
Diffraction analysis confirms that it does not limit the current design, as the radiation mode size remains well below the beamline aperture. To mitigate slippage, we propose a chicane-embedded optical-delay scheme that restores phase synchronism between the radiation and the microbunched electrons. Simulations demonstrate that optimized dispersive tuning enables staged amplification, preserves beam quality, and enables multi-megawatt peak powers.
These results demonstrate the potential of THz-tailored optical klystrons to generate compact, short, and high-intensity THz pulses, and provide a foundation for future experimental validation and implementation at next-generation accelerator facilities.
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