Diplexers for Power Combination and Switching in High Power ECRH Systems

Bruschi, A.; Erckmann, V.; Kasparek, W.; Petelin, M. I.; Thumm, M.; Bin, W.; Cirant, S.; D'Arcangelo, O.; Hollmann, Frank; Lubyako, L. V.; Noke, F.; Plaum, B.; Purps, F.; Zohm, H.

doi:10.1109/tps.2010.2047658

Cited by 15 publications

(6 citation statements)

References 26 publications

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“…Their behav-ior is controlled additionally by the input frequency which offers a wide range of applications, see [34] for details. Due to their resonant behavior, we no longer have just a forward propagation in the analysis.…”

Section: Resultsmentioning

confidence: 99%

Numerical Modeling of Millimeter-Wave Transmission Lines

Michel

2010

IEEE Trans. Plasma Sci.

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The transmission of high-power millimeter waves for electron cyclotron resonace heating of plasmas is a well developed field which has reached a mature level over the years [1]. The design goals are low transmission losses, high mode purity and arbitrary polarization adjustment with low cross polarization. Quasi-optical and waveguide techniques are at hand for the design of transmission lines which in most cases are a combination of both approaches. This article discusses the efficient numerical processing of paraxial beams and fields in oversized corrugated waveguides including polarization, and how these methods can be used for the analysis, synthesis and modeling of the RF fields from the gyrotron cavity to the plasma.

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Section: Resultsmentioning

confidence: 99%

Numerical Modeling of Millimeter-Wave Transmission Lines

Michel

2010

IEEE Trans. Plasma Sci.

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“…The main application of the T-shaped switching device is the stabilization of the NTM by switching the RF beam rapidly. Instead of using the conventionally researched diplexers proposed for use in the ECCD system of ITER, 9) the T-shaped switching device will be used to suppress the cost of the transmission system significantly and make it more compact. For the application to the ECCD system, it is necessary to develop cooling and displacement systems of dielectric mirrors.…”

Section: Applications To Eccd Systemmentioning

confidence: 99%

Development of a prototype T-shaped fast switching device for electron cyclotron current drive systems

Sekiguchi

Nagashima

Honzu

et al. 2016

Jpn. J. Appl. Phys.

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A T-shaped high-power switching device composed of circular corrugated waveguides with three ports and double dielectric disks made of sapphire was proposed as a fast switching device based on a new principle in electron cyclotron current drive systems. This switching device has the advantages of operating at a fixed frequency and being compact. The design of the prototype switch was obtained by numerical simulations using a finite-difference time-domain (FDTD) method. The size of these components was optimized for the frequency band of 170 GHz. Low-power tests were carried out in a cross-shaped model.

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“…Note, that the sophisticated fast calculation of plasma profiles and related 'real-time' equilibrium reconstruction for position feed back becomes obsolete for this type of observation and may simplify the MHD-control feed back system. The transmission characteristics of diplexers can be tailored according to the needs and several types were investigated in low power experiments [15]. Driven by the physics demands for advanced NTM-control experiments at AUG, a resonant diplexer with a narrow resonance of about 12 MHz FWHM and a free spectral range of 141 MHz was chosen.…”

Section: Four-port Diplexers As Tl-switches and Beam Combinersmentioning

confidence: 99%

Large Scale CW ECRH Systems: Some considerations

Erckmann

Kasparek

Plaum

et al. 2012

EPJ Web of Conferences

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Abstract. Electron Cyclotron Resonance Heating (ECRH) is a key component in the heating arsenal for the next step fusion devices like W7-X and ITER. These devices are equipped with superconducting coils and are designed to operate steady state. ECRH must thus operate in CW-mode with a large flexibility to comply with various physics demands such as plasma start-up, heating and current drive, as well as configurationand MHD -control. The request for many different sophisticated applications results in a growing complexity, which is in conflict with the request for high availability, reliability, and maintainability. 'Advanced' ECRH-systems must, therefore, comply with both the complex physics demands and operational robustness and reliability. The W7-X ECRH system is the first CW-facility of an ITER relevant size and is used as a test bed for advanced components. Proposals for future developments are presented together with improvements of gyrotrons, transmission components and launchers.

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Diplexers for Power Combination and Switching in High Power ECRH Systems

Cited by 15 publications

References 26 publications

Numerical Modeling of Millimeter-Wave Transmission Lines

Numerical Modeling of Millimeter-Wave Transmission Lines

Development of a prototype T-shaped fast switching device for electron cyclotron current drive systems

Large Scale CW ECRH Systems: Some considerations

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