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<p>Terahertz (THz) radiation possesses unique properties that make it a promising light source for applications in various fields, particularly spectroscopy and imaging. Ongoing research and development in THz technology has focused on developing or improving THz sources, detectors, and applications. At the PBP-CMU Electron Linac Laboratory (PCELL) of the Plasma and Beam Physics Research Facility in Chiang Mai University, high-intensity THz radiation has been generated in the form of coherent transition radiation (TR) and investigated since 2006 for electron beams with energies ranging from 8 to 12&#xa0;MeV. In this study, we investigate and optimize the coherent TR arising from short electron bunches with energies ranging from 8 to 22&#xa0;MeV using an upgraded linear-accelerator system with a higher radio-frequency (RF) power system. This radiation is then transported from the accelerator hall to the experimental room, in which the spectrometers are located. Electron-beam simulations are conducted to achieve short bunch lengths and small transverse beam sizes at the TR station. Radiation properties, including the radiation spectrum, angular distribution, and radiation polarization, are thoroughly investigated. The electron-bunch length is evaluated using the measuring system. The radiation-transport line is designed to achieve optimal frequency response and high transmission efficiency. A radiation-transmission efficiency of approximately 80–90% can be achieved with this designed system, along with a pulse energy ranging from 0.17 to 0.25&#xa0;µJ. The expected radiation spectral range covers up to 2 THz with a peak power of 0.5–1.25&#xa0;MW. This coherent, broadband, and intense THz radiation will serve as a light source for THz spectroscopy and THz time-domain spectroscopy applications at the PCELL in the near future.</p>

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Design and optimization of generation and transportation systems for coherent THz transition radiation in spectroscopic applications

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Siriwan Pakluea,
  • Kanlayaporn Kongmali,
  • Monchai Jitvisate,
  • Jatuporn Saisut,
  • Chitrlada Thongbai,
  • Sakhorn Rimjaem

摘要

Terahertz (THz) radiation possesses unique properties that make it a promising light source for applications in various fields, particularly spectroscopy and imaging. Ongoing research and development in THz technology has focused on developing or improving THz sources, detectors, and applications. At the PBP-CMU Electron Linac Laboratory (PCELL) of the Plasma and Beam Physics Research Facility in Chiang Mai University, high-intensity THz radiation has been generated in the form of coherent transition radiation (TR) and investigated since 2006 for electron beams with energies ranging from 8 to 12 MeV. In this study, we investigate and optimize the coherent TR arising from short electron bunches with energies ranging from 8 to 22 MeV using an upgraded linear-accelerator system with a higher radio-frequency (RF) power system. This radiation is then transported from the accelerator hall to the experimental room, in which the spectrometers are located. Electron-beam simulations are conducted to achieve short bunch lengths and small transverse beam sizes at the TR station. Radiation properties, including the radiation spectrum, angular distribution, and radiation polarization, are thoroughly investigated. The electron-bunch length is evaluated using the measuring system. The radiation-transport line is designed to achieve optimal frequency response and high transmission efficiency. A radiation-transmission efficiency of approximately 80–90% can be achieved with this designed system, along with a pulse energy ranging from 0.17 to 0.25 µJ. The expected radiation spectral range covers up to 2 THz with a peak power of 0.5–1.25 MW. This coherent, broadband, and intense THz radiation will serve as a light source for THz spectroscopy and THz time-domain spectroscopy applications at the PCELL in the near future.