Frequency Tunable sub-THz Gyrotron for Direct Measurements of Positronium Hyperfine Structure

  • A. E. FedotovEmail author
  • R. M. Rozental
  • I. V. Zotova
  • N. S. Ginzburg
  • A. S. Sergeev
  • V. P. Tarakanov
  • M. Yu. Glyavin
  • T. Idehara


The feasibility of a high-power sub-THz gyrotron with smooth wideband frequency tuning suitable for direct measurement of the positronium hyperfine structure is demonstrated numerically using both averaged equations and PIC-code simulations. Analytical estimates show that the frequency-tunable powerful sub-THz radiation can be generated through the excitation of high-order axial modes in a gyrotron with short cavity driven by an electron beam with high current. Simulations show that an output power of 0.5–1 kW can be obtained at a frequency of about 0.2 THz within a 10-GHz band which are the parameters needed for testing of quantum electrodynamics predictions through the spectroscopy of positronium.


Gyrotron Terahertz radiation Frequency tuning Spectroscopy Positronium 



The work was supported by the Russian Science Foundation under grant no. 16-12-10445.


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

Authors and Affiliations

  1. 1.Institute of Applied Physics of the Russian Academy of SciencesNizhny NovgorodRussia
  2. 2.Research Center for Development of Far-Infrared RegionUniversity of Fukui (FIR UF)FukuiJapan
  3. 3.Moscow Engineering Physics InstituteMoscowRussia
  4. 4.Joint Institute for High TemperaturesRussian Academy of SciencesMoscowRussia

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