Experimental eighth harmonic cusptron device

K. K. Tiong, S. P. Kuo, P. E. Miller, W. Namkung

Research output: Contribution to conferencePaperpeer-review


A cusptron device operating at eighth cyclotron harmonic has been set up for the development of a compact and high-power microwave source. An axis-encircling electron beam of 25 KeV (γ= 1.05) as the radiation source is produced from an annular thermionic cathode of 1.1-cm radius and 0.16-cm radial thickness with a Pierce-type focusing electrode together with a cusp magnetic field. Slotted cylindrical waveguides similar to the anode blocks of magnetron are used. Like the magnetron device, the cusptron can have π-mode and 2π-mode operations. It is the purpose of this work to identify experimentally which is the more efficient mode of operation. A comparison of the operations is made by imposing a fixed output frequency in the waveguide design. For the 2π-mode operation, an 8-slotted waveguide with b/a = 2.2 is used, where b and a are the radii of the slots and the inner wall of the waveguide, respectively. A 16-slotted waveguide with b/a = 1.23 is used for the π-mode operation. The functional dependence of the radiation efficiencies on beam current at fixed beam energy (γ= 1.05) has also been studied.

Original languageEnglish (US)
Number of pages2
StatePublished - 1988
EventIEEE International Conference on Plasma Science - 1988 - Seattle, WA, USA
Duration: Jun 6 1988Jun 8 1988


OtherIEEE International Conference on Plasma Science - 1988
CitySeattle, WA, USA

ASJC Scopus subject areas

  • General Engineering


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