Powering a Photogun using Single-Cycle Terahertz

Kroh, Tobias; Rohwer, Timm; Dinter, H.; Kellermeier, Max; Fakhari, Moein; Demırbas, Umıt; Çankaya, Hüseyin; Pergament, Mikhail; Hemmer, Michaël; Abmann, R.; Kärtner, Franz X.; Matlis, Nicholas H.

doi:10.1109/irmmw-thz46771.2020.9370870

Cited by 1 publication

(1 citation statement)

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“…This process continues after the traveling-wave section by an additional drift section, resulting in a bunched electron pulse of approximately 150 f s, necessary for emitting coherent THz superradiance [5]. Current methods of THz generation such as laser-based emission [6][7][8], dielectric lined waveguides (DLWS) [9], Cherenkov FEL [10], nonlinear metasurfaces [11], etc. are especially limited when high power is required.…”

Section: Introductionmentioning

confidence: 99%

High-Power Terahertz Free Electron Laser via Tapering-Enhanced Superradiance

Feigin,

Gover,

Friedman

et al. 2024

Electronics

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A superradiant FEL in the THz (3 THz) region is currently operating at Ariel University. It is based on the novel ORGAD accelerator, which is a hybrid linear RF photo-cathode 6 MeV electron gun. The hybrid term stands for its unique standing wave (SW)—traveling wave (TW) structure. The undulator generates spontaneous superradiance, which corresponds to spontaneous emission when the electron bunch duration is shorter than the radiated frequency, resulting in a much higher photon yield. However, the efficiency of this scheme is still quite low. In order to achieve higher emission (by improved efficiency), we intend to implement a new and promising radiative interaction scheme: tapering-enhanced superradiance (TES). This particular undulator design employs a tapered (amplitude) undulator in the zero-slippage condition to obtain a significantly more powerful and efficient THz radiation source. At the current stage, the scheme is designed for emission at approximately 0.5 THz. The design and start-to-end simulations demonstrate significant enhancement of superradiant energy and extraction efficiency using this method compared to a reference uniform case.

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