Quasioptical transformer which transforms the waves in a waveguide having a circular cross section into a highly directional wave beam

Vlasov, S. N.; Orlova, I. M.

doi:10.1007/bf01037072

Cited by 133 publications

(40 citation statements)

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“…The mode converter consists of: 1) a section of a regular waveguide with a simple rectangular cut, 2) the quasi-parabolic mirror [9], and 3) the pair of synthesized mirrors [10,11].…”

Section: Quasi-optical Mode Convertermentioning

confidence: 99%

Transmission Line for 258 GHz Gyrotron DNP Spectrometry

Богдашов

Belousov

Чирков

et al. 2011

J Infrared Milli Terahz Waves

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We describe the design and test results of the transmission line for liquid-state (LS) and solid-state (SS) DNP spectrometers with the second-harmonic 258.6 GHz gyrotron at the Institute of the Biophysical Chemistry Center of Goethe University (Frankfurt). The 13-meter line includes a mode converter, HE11 waveguides, 4 mitre bends, a variable polarizer-attenuator, directional couplers, a water-flow calorimeter and a mechanical switch. A microwave power of about 15 W was obtained in the pure HE11 mode at the spectrometer inputs.

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“…The mode converter consists of: 1) a section of a regular waveguide with a simple rectangular cut, 2) the quasi-parabolic mirror [9], and 3) the pair of synthesized mirrors [10,11].…”

Section: Quasi-optical Mode Convertermentioning

confidence: 99%

Transmission Line for 258 GHz Gyrotron DNP Spectrometry

Богдашов

Belousov

Чирков

et al. 2011

J Infrared Milli Terahz Waves

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“…An internal Q.O. mode converter consisting of an oversized open-ended smooth-wall circular waveguide launcher and a set of focusing mirrors with quadratic surface contour function was first proposed and demonstrated by Vlasov et al [1,2]. In a Vlasov-type launcher, the power density on the wall is uniform, the fields at the edges of cuts are relative strong, the Gaussian mode content in the wave beam radiated from the launcher amounts to about 80%, while the remaining 20% of the radiation propagate at relatively large angles to the beam direction because of wave scattering and diffraction at the edges of the cuts, and are usually lost in open transmission lines.…”

Section: Introductionmentioning

confidence: 99%

Development of Mode Conversion Waveguides at KIT

Jin

Gantenbein

Jelonnek

et al. 2015

EPJ Web of Conferences

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Abstract. The development of mode conversion waveguides (launchers) for high power gyrotrons has gone through three stages at KIT. Formerly, harmonically deformed launchers have been used in the series gyrotrons developed for the stellarator W7-X. In 2009, a numerical method for the analysis and synthesis of mirror-line launchers was developed at KIT. Such a launcher with adapted mode-converting mirrors for a 2 MW TE 34,19 -mode, 170GHz coaxial-cavity gyrotron has been designed and tested, and also a mirror-line launcher for the 1MW EU ITER gyrotron has been designed. Recently, based on the Helmholtz-Kirchhoff integral theorem, a novel numerical method for the synthesis of hybrid-type gyrotron launchers has been developed. As an example, TE 32,9 mode launchers operating at 170GHz that have been designed using the three different methods are being compared.

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“…The arrangement is shown in Figure 8. It consists of a Vlasov coupler [30] that converts the TE 02 mode into a quasi-Gaussian mode, followed by a steering/shaping mirror. Based on similar couplers designed for other gyrotrons, a conversion efficiency of over 90% should be achievable with this approach [3132 -33].…”

Section: Output Coupler and Collectormentioning

confidence: 99%

A submillimeter-wave gyroklystron: theory and design

Nusinovich

Walter²,

Kremer³

et al. 2000

IEEE Trans. Plasma Sci.

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New elements of the theory and a preliminary design for a pulse/CW 360 GHz gyroklystron are presented. Issues germane to very high frequency operation of gyroklystron amplifiers, including drive power and limits on cavity Q, are discussed. A specific two cavity design is described. That device had a gain of 33 dB and a beam extraction power of 1 kW with an electronic efficiency of 8% and a power output of 700 W after taking into account Ohmic losses . To produce fast rising pulses, the beam velocity ratio was varied via the modulating anode of a magnetron injection gun. A design for an electron gun through which reduction of the output signal by -50 dB was achieved by a 400 V modulation is given. The input coupler, cavities, electron gun, collector, output coupling optics and collector are described. In addition, issues concerning the fabrication of the high precision, 2 mm diameter cavities are discussed.

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Quasioptical transformer which transforms the waves in a waveguide having a circular cross section into a highly directional wave beam

Cited by 133 publications

References 0 publications

Transmission Line for 258 GHz Gyrotron DNP Spectrometry

Transmission Line for 258 GHz Gyrotron DNP Spectrometry

Development of Mode Conversion Waveguides at KIT

A submillimeter-wave gyroklystron: theory and design

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