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A THz Spectroscopy System Based on Coherent Radiation from Ultrashort Electron Bunches

Article

Abstract

A spectroscopy system will be discussed for coherent THz transition radiation emitted from short electron bunches, which are generated from a system consisting of an RF gun with a thermionic cathode, an alpha-magnet as a magnetic bunch compressor, and a linear accelerator for post-acceleration. The THz radiation is generated as backward transition radiation when electron bunches pass through an aluminum foil. The emitted THz transition radiation, which is coherent at wavelengths equal to and longer than the electron bunch length, is coupled to a Michelson interferometer. The performance of the spectroscopy system employing a Michelson interferometer is discussed. The radiation power spectra under different conditions are presented. As an example, the optical constant of a silicon wafer can be obtained using the dispersive Fourier transform spectroscopy (DFTS) technique.

Keywords

Short electron bunches Accelerator-based THz radiation Coherent THz transition radiation THz spectroscopy DFTS 

Notes

Acknowledgements

The authors would like to thank Mr. N. Kangrang, Mr. P. Wichaisirimongkol, and Mr. M.W. Rhodes for their technical supports; Prof. H. Wiedemann for his suggestions and valuable discussions; and Ms. C. Bail for her proof reading assistance. The authors would also like to acknowledge the support of the Thailand Center of Excellence in Physics (ThEP center) and the Department of Physics and Materials Science, the Faculty of Science, Chiang Mai University. Special thanks are extended to the Terahertz Technology Laboratory (TTL) at Thailand’s National Electronics and Computer Technology Center (NECTEC) for the use of THz spectroscopy system (TeraFlash) to characterize beam splitters and copper mesh filters properties.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Plasma and Beam Physics Research Facility, Department of Physics and Materials ScienceChiang Mai UniversityChiang MaiThailand
  2. 2.Thailand Center of Excellence in Physics, Commission on Higher EducationBangkokThailand

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