Speaker
Description
The relatively new sub-field of dielectric terahertz-driven accelerators (DTAs), which combines terahertz (THz) technology and dielectric laser accelerators, has gained relevance in recent years. To achieve high acceleration gradients, high-intensity THz fields are required. Therefore, high-gradient DTAs encompass the design of compact, high-intensity THz pulse sources.
In this work, we present two important elements for a compact, high-gradient accelerator: 1) A high-THz-frequency source based on periodically-inverted crystals pumped with an ultra-short infrared pulse with a central wavelength of 1.7 µm, and 2) An innovative DTA that incorporates a dual-pillar grating arrangement within a tapered parallel-plate waveguide (TPPWG). This compact configuration enables particle acceleration via multi-cycle, narrowband terahertz pulses.
High-frequency THz pulses in QPM crystals are explored by optimizing pump duration, intensity, and pumping scheme to maximize the optical-to-terahertz conversion efficiency, enabling THz pulses up to 4 THz and beyond. Time-domain simulations on the TPPWG indicate that optimizing the waveguide parameters results in a sixfold increase in peak electric-field amplification at the waveguide end. Particle-in-cell (PIC) simulations demonstrate that the structure supports net acceleration with gradients up to 120 MeV m-1 for 0.1 GV m-1 field strengths, and can accommodate bunch charges up to 10 pC with minimal degradation.
Funding Agency
European Union’s Horizon Europe grant agreement no. 101073480. Project no. TKP2021-EGA-17 financed under the TKP2021 and the project 20240-2.1.1-EKOP grant programme EKOP-24-4.
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