Plasma and Fusion Research

Volume 4, 011 (2009)

Rapid Communications

Achievement of High Power Sub-Terahertz Radiations with a Second Harmonic Gyrotron
Takashi NOTAKE, Teruo SAITO, Yoshinori TATEMATSU, Akihito FUJII, Shinya OGASAWARA, La AGUSU, Vladimir N. MANUILOV, Isamu OGAWA and Toshitaka IDEHARA
Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan
(Received 24 January 2009 / Accepted 9 February 2009 / Published 6 March 2009)

Abstract

High power, single mode oscillations from a sub-terahertz gyrotron, at a second harmonic, were successfully demonstrated with pulse operation. A powerful electron gun was applied to attain high power oscillation. The resonant modes were selected carefully enough to oscillate singly and the cavity shape was optimized for the resonant modes to interact efficiently with an electron beam generated by the electron gun. Optimizing the operational parameters produced output powers of 33 and 27 kW, at frequencies of 349 and 389 GHz, respectively—the highest oscillation powers obtained to date in the sub-terahertz frequency region.

Keywords

gyrotron, sub-terahertz technology, electron cyclotron maser, collective Thomson scattering

DOI: 10.1585/pfr.4.011

Full Text

PDF format (134Kbytes) PDF Download

References

  • [1] K. Sakamoto et al., Nature Phys. 3, 411 (2007).
  • [2] K. Felch et al., Nucl. Fusion 48, 054008 (2008).
  • [3] T. Idehara et al., Int. J. Infrared Millim. Waves 27, 319 (2006).
  • [4] M.Yu. Glyavin et al., Phys. Rev. Lett. 100, 015101 (2008).
  • [5] T. Saito et al., J. Plasma Fusion Res. 84, 853 (2008) [in Japanese].
  • [6] T. Notake et al., Rev. Sci. Instrm. 79, 10E732 (2008).
  • [7] Y. Tatematsu et al., Proc. of 35th IRMMW (2008), p. 42.
  • [8] T. Notake et al., J. Plasma Fusion Res. 84, 887 (2008) [in Japanese].
  • [9] V.N. Manuilov et al., Int. J. Infrared Millim. Waves 29, 1103 (2008).
  • [10] B.G. Danly and R.J. Temkin, Phys. Fluids 29, 561 (1985).
  • [11] M. Thumm, Wissenschaftliche Berichte FZKA7392, (2008) Research report of Research Center, Karlsruhe University.

This paper may be cited as follows:

Takashi NOTAKE, Teruo SAITO, Yoshinori TATEMATSU, Akihito FUJII, Shinya OGASAWARA, La AGUSU, Vladimir N. MANUILOV, Isamu OGAWA and Toshitaka IDEHARA, Plasma Fusion Res. 4, 011 (2009).