Experimental Study on W-Band (75 - 110 GHz) Oversized Surface Wave Oscillator Driven by Weakly Relativistic Electron Beams

• SAN Min Thu

  Graduate School of Science and Technology, Niigata University

• OGURA Kazuo

  Graduate School of Science and Technology, Niigata University

• YAMBE Kiyoyuki

  Graduate School of Science and Technology, Niigata University

• ANNAKA Yuta

  Graduate School of Science and Technology, Niigata University

• GONG Shaoyan

  Graduate School of Science and Technology, Niigata University

• KAWAMURA Jun

  Graduate School of Science and Technology, Niigata University

• MIURA Takuro

  Graduate School of Science and Technology, Niigata University

• KUBO Shin

  National Institute for Fusion Science

• SHIMOZUMA Takashi

  National Institute for Fusion Science

• KOBAYASHI Sakuji

  National Institute for Fusion Science

• OKADA Kohji

  National Institute for Fusion Science

Abstract

A W-band (75 - 110 GHz) oversized surface wave oscillator driven by weakly relativistic electron beams with energy in the range of 10 - 80 keV is studied. Rectangular corrugations are used as slow-wave structures (SWS) having surface waves with an upper cutoff frequency of approximately 100 GHz (W-band). Uniformly distributed annular electron beams are generated by a disk-type cold cathode and then are injected into the W-band oscillator. A longer SWS length causes the oscillator to function in both backward wave oscillator (BWO) and travelling wave tube (TWT) operations, and no meaningful oscillation occurs at the π-point or the Bragg condition. When the SWS length is short enough, oscillation occurs in all regions: BWO, π-point and TWT. The operations of the oscillator are strongly affected by the structure length. The maximum radiation power is estimated to be approximately 20 kW with the figure of merit of about 2 × 10² MW.GHz².

Journal

• Plasma and Fusion Research

  Plasma and Fusion Research 11 (0), 2406085-2406085, 2016

  The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

• surface wave
• travelling wave tube operation
• backward wave oscillator operation
• π-point
• W-band

Details

• CRID: 1390001205254171264
• NII Article ID: 130005401653
• NII Book ID: AA12346675
• DOI: 10.1585/pfr.11.2406085
• ISSN: 18806821
• HANDLE: 10655/00013321
• Web Site: https://nifs-repository.repo.nii.ac.jp/records/11392
• Web Site: https://www.jstage.jst.go.jp/article/pfr/11/0/11_2406085/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed