INSTRUMENTATION AND MEASUREMENT |
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Optical design of the time-resolved ARPES beamline of the new material spectroscopy experimental station for the update of CAEP THz-FEL facility |
Liang-Liang Du(杜亮亮), Li-Min Meng(孟立民)†, Jiang Li(李江), and Li-Guo Zhu(朱礼国) |
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, China |
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Abstract The Chinese Academy of Engineering Physics Terahertz Free Electron Laser Facility (CAEP THz FEL, CTFEL) is the only high-average power free electron laser terahertz source based on superconducting accelerators in China. The update of the CTFEL is now undergoing and will expand the frequency range from 0.1-4.2 THz to 0.1-125 THz. Two experimental stations for material spectroscopy and biomedicine will be built. A high harmonic generation (HHG) lightsource based beamline at the material spectroscopy experimental station for time-resolved angle-resolved photoemission spectroscopy (ARPES) research will be constructed and the optical design is presented. The HHG lightsource covers the extreme ultraviolet (XUV) photon energy range of 20-50 eV. A Czerny-Turner monochromator with two plane gratings worked in conical diffraction configuration is employed to maintain the transmission efficiency and preserve the pulse time duration. The calculated beamline transmission efficiency is better than 5% in the whole photon energy range. To our knowledge, this is the first time in China to combine THz-infrared FEL with HHG light source, and this experimental station will be a powerful and effective instrument that will give new research opportunities in the future for users doing research on the dynamic evolution of the excited electron band structure of a material's surface.
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Received: 28 May 2024
Revised: 20 August 2024
Accepted manuscript online: 27 August 2024
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PACS:
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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32.80.Wr
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(Other multiphoton processes)
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Corresponding Authors:
Li-Min Meng
E-mail: menglimin82@126.com
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Cite this article:
Liang-Liang Du(杜亮亮), Li-Min Meng(孟立民), Jiang Li(李江), and Li-Guo Zhu(朱礼国) Optical design of the time-resolved ARPES beamline of the new material spectroscopy experimental station for the update of CAEP THz-FEL facility 2024 Chin. Phys. B 33 114203
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