Paper |
Title |
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TUPOPT029 |
Infrared Free-Electron Laser Project in Thailand |
1070 |
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- S. Rimjaem, N. Chaisueb, P. Kitisri, K. Kongmali, E. Kongmon, P. Nanthanasit, S. Pakluea, J. Saisut, S. Sukara, K. Techakaew, C. Thongbai
Chiang Mai University, Chiang Mai, Thailand
- P. Apiwattanakul, P. Jaikaew, W. Jaikla, N. Kangrang
Chiang Mai University, PBP Research Facility, Chiang Mai, Thailand
- M. Jitvisate
Suranaree University of Technology, Nakhon Ratchasima, Thailand
- M.W. Rhodes
ThEP Center, Commission on Higher Education, Bangkok, Thailand
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The infrared free-electron laser (IR FEL) project is established at Chiang Mai University in Thailand with the aim to provide experimental stations for users utilizing accelerator-based terahertz (THz) and mid-infrared (MIR) radiation. Main components of the system include a thermionic RF gun, an alpha magnet as a bunch compressor and energy filter, a standing-wave RF linac, a THz transition radiation (THz-TR) station, two magnetic bunch compressors and beamlines for MIR/THz FEL. The system commissioning is ongoing to produce the beams with proper properties. Simulation results suggest that the oscillator MIR-FEL with wavelengths of 9.5-16.6 um and pulse energies of 0.15-0.4 uJ can be produced from 60-pC electron bunches with energy of 20-25 MeV. The super-radiant THz-FEL with frequencies of 1-3 THz and 700 kW peak power can be produced from 10-16 MeV electron bunches with a charge of 50 pC and a length of 200-300 fs. Furthermore, the THz-TR with a spectral range of 0.3-2.5 THz and a pulse power of up to 1.5 MW can be obtained. The MIR/THz FEL will be used as high-brightness light source for pump-probe experiments, while the coherent THz-TR will be used in time-domain spectroscopy.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOPT029
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About • |
Received ※ 08 June 2022 — Revised ※ 12 June 2022 — Accepted ※ 13 June 2022 — Issue date ※ 16 June 2022 |
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THPOMS056 |
An Overview of the Applications of MIR and THz Spectroscopy in Astrochemistry Studies |
3102 |
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- C. Suwannajak, U. Keyen, A. Leckngam, N. Tanakul
NARIT, Chiang Mai, Thailand
- W. Jaikla, S. Pakluea, P. Wongkummoon
Chiang Mai University, PBP Research Facility, Chiang Mai, Thailand
- M. Jitvisate
Suranaree University of Technology, Nakhon Ratchasima, Thailand
- P. Nimmanpipug, S. Rimjaem
ThEP Center, Commission on Higher Education, Bangkok, Thailand
- S. Pakluea, S. Rimjaem, P. Wongkummoon
Chiang Mai University, Chiang Mai, Thailand
- T. Phimsen
SLRI, Nakhon Ratchasima, Thailand
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Interstellar complex molecules can be found in molecular clouds which are spread throughout our galaxy. Some of these molecules are thought to be the precursors of bio-molecules. Therefore, understanding the formation processes of those interstellar complex molecules is crucial to understanding the origin of the building blocks of life. There are currently more than a hundred known complex molecules discovered in interstellar clouds. However, the formation processes of those molecules are not yet well understood since they occur in very extreme conditions and very short time scale. Ultrafast spectroscopy can be applied to study those processes that occur in the time scale of femtoseconds or picoseconds. In this work, we present an overview of the applications of MIR and THz pump-probe experiments in astrochemistry studies. An experimental setup to simulate space conditions that mimic the environments where the interstellar complex molecules are formed is currently being developed at the PBP-CMU Electron Linac Laboratory. Then, we present our development plan of the experimental station and its current status.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS056
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About • |
Received ※ 08 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 23 June 2022 |
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TUPOPT054 |
Generation of Coherent THz Transition Radiation for Time Domain Spectroscopy at the PBP-CMU Electron Linac Laboratory |
1129 |
SUSPMF019 |
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- S. Pakluea
Chiang Mai University, PBP Research Facility, Chiang Mai, Thailand
- M. Jitvisate
Suranaree University of Technology, Nakhon Ratchasima, Thailand
- S. Rimjaem, J. Saisut, C. Thongbai
Chiang Mai University, Chiang Mai, Thailand
- S. Rimjaem, J. Saisut, C. Thongbai
ThEP Center, Commission on Higher Education, Bangkok, Thailand
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The accelerator system at the PBP-CMU Electron Linac Laboratory is used to generate terahertz transition radiation (THz-TR). Due to broad spectrum, it can be used as the light source for THz time-domain spectroscopy (TDS) to measure both the intensity and phase of the THz signal. This contribution presents the generation of the THz-TR produced from 10-20 MeV electron beams and the system preparation for THz TDS. The electron bunches, which are compressed to have a length of femtosecond scale at the experimental station, is used to generate the THz-TR using a 45°-tilted aluminum foil as a radiator. The radiation properties including angular distribution, polarization and radiation spectrum are measured in the accelerator hall and at the TDS station. The radiation spectral range covers up to 2.3 THz with the peak power of 0.5 - 1.25 MW is expected. The effects of electron bunch distribution, divergence of the beam and influence of optical components on the radiation properties were studied. The results show that the considered effects have a significant impact on the TR properties. The Information will be used in the TR characterization that is needed to be interpreted carefully.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOPT054
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|
About • |
Received ※ 08 June 2022 — Revised ※ 14 June 2022 — Accepted ※ 27 June 2022 — Issue date ※ 04 July 2022 |
Cite • |
reference for this paper using
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※ LaTeX,
※ Text/Word,
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