Journal ArticleDOI
Study of combined transmission line for high power wave generated by a gyrotron in the millimetre wavelength range
M. A. Shapiro,S. N. Vlasov +1 more
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In this article, a millimetre-wave line transmitting energy from a gyrotron to a tokamak is studied, where the line is open and combines mirrors and sections of an irregular oversized circular waveguide.Abstract:
A powerful millimetre-wave line transmitting energy from a gyrotron to a tokamak is studied. The line is open and combines mirrors and sections of an irregular oversized circular waveguide. The construction of the transmission line units is improved to provide selectivity for the operating TE01 mode. Particularly, the open quasioptical elbow operating at the long-wave region of the millimetre range and rotating the line by an angle of 90° is experimentally investigated. The operating TE01 mode insertion losses are 0.2-0.3 dB with a 4% bandwidth.read more
Citations
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Journal ArticleDOI
Passive high-power microwave components
Manfred Thumm,W. Kasparek +1 more
TL;DR: In this article, the authors present state-of-the-art passive high-power microwave components for applications in microwave systems for RF plasma generation and heating, plasma diagnostics, plasma and microwave materials processing, spectroscopy, communication, radar ranging and imaging, and for drivers of next generation high-field-gradient electron-positron linear colliders.
Journal ArticleDOI
HE11 mitre bends and gaps in a circular corrugated waveguide
J. L. Doane,C. P. Moeller +1 more
TL;DR: In this paper, the authors derived the HE11 transmission loss in a mitre bend or gap in a corrugated waveguide using mode matching techniques and measured data on mitre bends that are in agreement with these expectations.
Journal ArticleDOI
A fast switch, combiner and narrow-band filter for high-power millimetre wave beams
W. Kasparek,M. Petelin,Dmitry Yu. Shchegolkov,V. Erckmann,Burkhard Plaum,Alessandro Bruschi,Ecrh Groups at Ipp Greifswald,Fzk Karlsruhe,Ipf Stuttgart +8 more
TL;DR: In this paper, a fast directional switch (FADIS) is described, which allows controlled switching of high-power microwaves between two outputs by a small frequency-shift keying of the gyrotron (some tens of megahertz) and a narrow-band diplexer.
Journal ArticleDOI
The ec h&cd transmission line for iter
Franco Gandini,T.S. Bigelow,B. Becket,John Caughman,D. Cox,C. Darbos,T. Gassmann,M. A. Henderson,O. Jean,Ken Kajiwara,N. Kobayashi,C. Nazare,Yasuhisa Oda,T. Omori,D. Purohit,David A Rasmussen,Dennis Ronden,G. Saibene,Keishi Sakamoto,Michael A. Shapiro,Koji Takahashi,Richard J. Temkin +21 more
TL;DR: In this paper, the authors presented the actual design and technical requirements of the transmission line associated with the ITER electron cyclotron heating and current drive system, and two different TL layouts are at the moment under study, to accommodate the two alternative options for the European sources: four 2MW units or eight 1-MW units.
Journal ArticleDOI
Compact Wideband Corrugated Feedhorns With Ultra-Low Sidelobes for Very High Performance Antennas and Quasi-Optical Systems
Johannes McKay,Duncan A. Robertson,P.A.S. Cruickshank,Robert I. Hunter,David R. Bolton,Richard Wylde,Graham Smith +6 more
TL;DR: In this article, the authors describe a general analytic methodology for the design of compact dual-profiled corrugated horns with extremely low sidelobe levels, and demonstrate that it is possible to achieve approximately 50 dB sidelobe level over wide bandwidths with short horns.
References
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Journal ArticleDOI
On the guided propagation of electromagnetic wave beams
Georg Goubau,F. Schwering +1 more
TL;DR: In this article, a beam waveguide is described by Laguerre polynomials, which satisfy orthogonality relations like the wave modes in a waveguide and can be reiterated and guided by reconstituting the cross-sectional phase distribution at certain intervals.
Journal Article
The Gyrotron
TL;DR: In this article, the authors described the genealogical tree of the gyrotron, stimulated emission of cyclotron radiation in microwave electronics from magnetron to gyroscope, and arrangement of the Gyroscope.
Journal ArticleDOI
Mode converters used in the Doublet III ECH microwave system
TL;DR: In this article, the authors show that the TE02 to TE01 converter has a conversion efficiency of at least 95% (99% predicted) while the TE01 to TE11 convertor has a 90% conversion efficiency (92% predicted).
Journal ArticleDOI
CW operation of a 140 GHz gyrotron
TL;DR: In this paper, the results of tests on a Varian 140 GHz CW gyrotron are presented and compared with theoretical predictions, as well as those of the output power and efficiency.
Journal ArticleDOI
A 60 GHz, 200 kW CW gyrotron with a pure output mode†
TL;DR: In this article, a Varian 60 GHz gyrotron designed specifically to generate microwaves in a single output mode has been operated at power levels up to 200 kW CW using mode-specific directional couplers.