Selective excitation of high-order modes in circular waveguides

Selective suppression of high order axial modes of the gyrotron backward-wave oscillator Phys. Plasmas 14, 093301 (2007) In this paper, we test the performance of a quasi-optical, internal-gyrotron mode converter. When cold testing mode converters, a rotating higher-order mode is commonly used. However, this requires a nontrivial design and precise alignment. We thus propose a new technique for testing gyrotron mode converters by using a simple, non-rotating, higher-order mode generator. We demonstrate the feasibility of this technique for a W-band gyrotron quasi-optical mode converter by examining the excitation of a TE 6,2 mode from a non-rotating mode generator. Our results demonstrate that this new cold-test scheme is an easy and efficient method for verifying the performance of quasi-optical mode converters.

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“…27,28 Similar to Sec. III A, we tested system (A) for the 65.4-mm dimpled launcher and system (C) for the 160-mm smooth launcher.…”

Section: B Measurement Results Using Rmgmentioning

confidence: 89%

Cold testing of quasi-optical mode converters using a generator for non-rotating high-order gyrotron modes

Kim

Choe

et al. 2014

Review of Scientific Instruments

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“…To perform low-power tests of the quasi-optical mode converter and mirror system of the gyrotron (launcher & mirrors) a mode generator has been designed and built, based on [7].…”

Section: Ghz 15 Mw Gyrotron For W7-xmentioning

confidence: 99%

New trends of gyrotron development at KIT: An overview on recent investigations

Gantenbein

Avramidis

Illy

et al. 2019

Fusion Engineering and Design

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“…T HE multi-mode generator follows quasioptical concepts which have turned out to be very successful for high purity rotating modes at fixed frequency operation in the past [1], [2]. Recent investigations have shown that this is also true when operated within a wide frequency range [3].…”

Section: Introductionmentioning

confidence: 99%

Operation of a quasioptical multi-mode generator for 105–150 GHz

Arnold¹,

Prinz²,

Wágner

et al. 2007

2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz El

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For low power measurements on the quasioptical mode converter system of the existing multi frequency gyrotron at Forschungszentrum Karlsruhe (FZK) a mode generator was developed and taken into operation. The gyrotron's mode converter system was optimized for 9 different modes in the frequency range from 105 to 143 GHz. At present a second generation mode converter is installed in the gyrotron for high power tests and an improved third generation is foreseen.The detailed setup of the multi-mode generator will be described and an excerpt of the many measured mode patterns at the output flange will be shown.

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Selective excitation of high-order modes in circular waveguides

Cited by 36 publications

References 4 publications

Cold testing of quasi-optical mode converters using a generator for non-rotating high-order gyrotron modes

Cold testing of quasi-optical mode converters using a generator for non-rotating high-order gyrotron modes

New trends of gyrotron development at KIT: An overview on recent investigations

Operation of a quasioptical multi-mode generator for 105–150 GHz

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Selective excitation of high-order modes in circular waveguides

Cited by 36 publications

References 4 publications

Cold testing of quasi-optical mode converters using a generator for non-rotating high-order gyrotron modes

Cold testing of quasi-optical mode converters using a generator for non-rotating high-order gyrotron modes

New trends of gyrotron development at KIT: An overview on recent investigations

Operation of a quasioptical multi-mode generator for 105&#x2013;150 GHz

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Operation of a quasioptical multi-mode generator for 105–150 GHz