Abstract
Terahertz (THz) radiation has attracted much attention in new scientific and industrial applications. There has been significant recent progress in generating THz with accelerators. To investigate the collective behavior of electron dynamics, we have proposed a new high throughput material characterization system, which supplies a multiple light source. The system includes a pre-bunched THz free electron laser (FEL), which is a high-power narrow-band THz source with a wide tuning range of frequency. The physical design with the main components of the facility is introduced, and the simulation results are illustrated. Radiation of 0.5–3.0 THz is obtained by the fundamental wave of the pre-bunched beam, and radiation covering 3.0–5.0 THz is realized by second harmonic generation. As the simulation shows, intense THz radiation could be achieved in a frequency from 0.5–5.0 THz, with a peak power of several megawatts (MWs) and a bandwidth of a few percent.
Highlights
Terahertz (THz) radiation gives access to tremendous applications in science [1,2,3,4,5], including physical properties of semiconductors, high-temperature superconductor characterization, label-free genetic analysis, chemical and biological objects
We report on the physical design of a pre-bunched THz free electron laser (FEL) under development at the University of Science and Technology of China
It is notable that the THz optical path is in low vacuum, while the accelerator and user facility are under an ultrahigh vacuum (UHV) environment
Summary
Terahertz (THz) radiation gives access to tremendous applications in science [1,2,3,4,5], including physical properties of semiconductors, high-temperature superconductor characterization, label-free genetic analysis, chemical and biological objects. Oscillator FELs are widely used in the higher frequency region due to their mature practical application, while the equipment is complicated, large scale and inconvenient for wavelength tuning Another kind of facility is the single-pass FEL, which utilizes an electron beam with a bunch length much shorter than the radiation wavelength to realize a coherent emission in an undulator. The modulated electron beam will generate high intensity radiation in the THz range Another method is to produce a pre-bunched electron beam from a photocathode by a THz-pulse-train laser illumination [10]. The pre-bunched THz FEL is high intensity in peak power, narrow scope in bandwidth and widely tunable in radiation frequency. It is a photoinjector-based single-pass FEL driven by a laser train with a THz interval.
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