Gyrotron operation during the first W7-X campaign-handling and reliability

Braune, H.; Laqua, H. P.; Marsen, S.; Moseev, D.; Noke, F.; Purps, F.; Schneider, Nicholas M.; Schulz, T.; Stange, T.; Uhren, P.

doi:10.1109/irmmw-thz.2016.7758425

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…The proposed system has been validated by the excitation of the TE28,8-mode at 140 GHz used for the 1 MW, CW gyrotrons for the stellerator W7-X at IPP Greifswald, Germany [5]. Recently, an upgraded 1.5 MW version of this gyrotron, with the possibility of operation also at 175 GHz, is under discussion.…”

Section: First Steps Towards a Fully Automated Mode Generator Setupmentioning

confidence: 99%

Towards Fully Automated Systems for the Generation of Very High Order Modes in Oversized Waveguides

Ruess¹,

Avramidis²,

Fuchs³

et al. 2018

EPJ Web Conf.

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Section: First Steps Towards a Fully Automated Mode Generator Setupmentioning

confidence: 99%

Towards Fully Automated Systems for the Generation of Very High Order Modes in Oversized Waveguides

Ruess¹,

Avramidis²,

Fuchs³

et al. 2018

EPJ Web Conf.

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“…In the following, the results of the excitation of the TE 28,8 mode at 140 GHz [4] operating in the gyrotrons for W7-X [5] are presented for benchmarking the new system. After successful adjustment of this TE 28,8 mode the launcher and the mirror system are assembled to the mode generator to measure the Gaussian mode content of the output beam on the window plane and compare it with previous cold and hot measurements.…”

Section: Introductionmentioning

confidence: 99%

Automated Generation of High-Order Modes for Tests of Quasi-Optical Systems of Gyrotrons for W7-X Stellarator

Ruess

Avramidis

Gantenbein

et al. 2019

2019 12th German Microwave Conference (GeMiC)

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A test system for the verification of the quasioptical converter system is vital in the gyrotron development. For this reason, an automated measurement setup has been developed and is benchmarked with the TE 28,8 mode operating in the cavities of the gyrotrons of W7-X with a high purity of about 95 % and a counter-rotating amount of about 0.3 %. The time duration for the mode generator adjustment has been reduced to two days for this mode. After a successful mode excitation, the quasi-optical mode converter, consisting of a launcher and three mirrors, is measured having a vectorial Gaussian mode content of 97 %.

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“…Therefore, gyrotrons are the only option to be used for efficient electron cyclotron resonance heating and electron cyclotron current drive (ECRH&CD) in nuclear fusion devices. For example, at the stellarator W7-X, fusion gyrotrons operating at 140 GHz and at 1 MW (1800 s) have already demonstrated their excellent reliable performance [1]. In Europe, the major fusion power plants under development are ITER at Cadarache [2] and EU DEMO (Demonstration Power Plant) [3].…”

Section: Introductionmentioning

confidence: 99%

Considerations on the selection of operating modes for future coaxial-cavity gyrotrons for DEMO

Ruess

Avramidis

Gantenbein

et al. 2018

2018 11th German Microwave Conference (GeMiC)

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At KIT, a modular 170 GHz, 2 MW TE34,19-mode coaxial-cavity gyrotron with advanced water cooling is ready for tests. The successful operation of this tube will be a first important step towards a possible future DEMO gyrotron. Nevertheless, looking forward, there are two questions to be answered: (i) what potential does the existing coaxial cavity offer with regards to MW-class multi-frequency operation also at higher frequencies, and (ii) what could be a different mode selection to achieve an even higher output power in a more compact gyrotron design. To provide an answer to (i), based on the 170 GHz, 2 MW preprototype the multi-frequency operation at multiples of the resonance frequency of the diamond disc RF output window was carried out. Additionally, a slightly modified cavity design was introduced. To answer the question (ii), the TE25,22-mode was chosen and compared with the results got for the TE34,19-mode. The extreme volume TE25,22-mode allows to reduce the beam radius by around 25 % and to increase the RF output power of the gyrotron by up to 30 %.

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Gyrotron operation during the first W7-X campaign-handling and reliability

Cited by 7 publications

References 3 publications

Towards Fully Automated Systems for the Generation of Very High Order Modes in Oversized Waveguides

Towards Fully Automated Systems for the Generation of Very High Order Modes in Oversized Waveguides

Automated Generation of High-Order Modes for Tests of Quasi-Optical Systems of Gyrotrons for W7-X Stellarator

Considerations on the selection of operating modes for future coaxial-cavity gyrotrons for DEMO

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