Millimeter-Wave Tunable Notch Filter Based on Waveguide Extension for Plasma Diagnostics

Danilov, Yury; Денисов, Г. Г.; Khozin, M. A.; Панин, А. Н.; Rodin, Yu.V.

doi:10.1109/tps.2014.2318352

Cited by 19 publications

(2 citation statements)

References 13 publications

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“…Two- frequency notch filters for the electron cyclotron emission (ECE) diagnostic systems both at the ASDEX Upgrade tokamak experiment at IPP Garching and the W7-X stellarator at IPP Greifswald were successfully realized applying advanced waveguide Bragg reflectors [8,9]. In the present paper, a much simpler and compact approach based on standard waveguide resonators with rectangular cross-section [10][11][12][13] is presented. The filter described in this paper is designed for application in ECE systems which are operated over a wide frequency range.…”

Section: Introductionmentioning

confidence: 99%

A Compact Two-Frequency Notch Filter for Millimeter Wave Plasma Diagnostics

Wágner

Kasparek

Leuterer

et al. 2020

J Infrared Milli Terahz Waves

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Sensitive millimeter wave diagnostics in magnetic confinement plasma fusion experiments need protection from gyrotron stray radiation in the plasma vessel. Modern electron cyclotron resonance heating (ECRH) systems take advantage of multi-frequency gyrotrons. This means that the frequency band of some millimeter wave diagnostics contains more than one narrow-band gyrotron-frequency line, which needs to be effectively suppressed. A compact standard waveguide notch filter based on coupled waveguide resonators with rectangular cross-section is presented which can provide very high suppression of several gyrotron frequencies and has low insertion loss of the passband.

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Section: Introductionmentioning

confidence: 99%

A Compact Two-Frequency Notch Filter for Millimeter Wave Plasma Diagnostics

Wágner

Kasparek

Leuterer

et al. 2020

J Infrared Milli Terahz Waves

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“…Here Q res -quality factor of the resonant reflector, Q di f -diffraction Q-factor of the gyrotron cavity, R 0 -maximal value of the reflection coefficient. Dependence of the reflection coefficient (amplitude-wise) on the frequency for the resonant reflector is R = R 0 /(1 + i ξ ) [30], where ξ = 2Q res ( f rad − f res )/ f res , f rad -gyrotron radiation frequency. Using the theory of the gyrotron with resonant reflections, developed in [13], [28], one can obtain the relationship between magnetic field B and the gyrotron radiation frequency:…”

Section: Theoretical Analysismentioning

confidence: 99%

Experimental Demonstration of Gyrotron Frequency Stabilization by Resonant Reflection

Fokin

Богдашов

Novozhilova

et al. 2021

IEEE Electron Device Lett.

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This letter presents the results of an experimental and theoretical study of the gyrotron frequency stabilization by a partial reflection of its radiation from an external high-Q resonator. The experiment was carried out with a gyrotron operating in a continuous wave regime at a frequency of 28 GHz at the second cyclotron harmonic. The use of an external quasi-optical two-mirror resonator as a reflector made it possible to reduce the variation of the radiation frequency upon modulation of the guiding magnetic field by order of magnitude to 0.8 GHz/T. The experimental results are in good agreement with the calculations.

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