The W7-X ECRH Plant: Recent Achievements

Erckmann, V.; Brand, Peter; Braune, H.; Dammertz, G.; Gantenbein, G.; Kasparek, W.; Laqua, H. P.; Michel, G.; Schmid, Martin; Thumm, M.; Weissgerber, M.; Greifswald, W X Ecrh Team at Ipp; Karlsruhe, W X Team at Fzk; Stuttgart, W X Team at Ipf

doi:10.1063/1.2800522

Cited by 4 publications

(3 citation statements)

References 6 publications

(5 reference statements)

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“…By proper tuning of both systems an almost perfectly flat power deposition profile along the collector area was obtained as seen in Fig. 9 [16]. A small DC-component was superimposed to control the position of the lower turning point.…”

Section: A the W7-x Gyrotronsmentioning

confidence: 99%

Progress in the 10-MW 140-GHz ECH System for the Stellarator W7-X

Thumm

Brand

Braune

et al. 2008

IEEE Trans. Plasma Sci.

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Abstract-During the last years electron cyclotron heating (ECH) has proven to be one of the most attractive heating schemes for stellarators, as it provides net current free plasma start up and heating. Both, the stellarator Wendelstein 7-X (W7-X), which is under construction at IPP-Greifswald, Germany, and the ITER tokamak, which will be built at Cadarache, France, will be equipped with a strong EC-heating and current drive system. independently. The polarization as well as the poloidal and toroidal launch angle can be adjusted individually to provide optimum conditions for different heating and current drive scenarios.

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Section: A the W7-x Gyrotronsmentioning

confidence: 99%

Progress in the 10-MW 140-GHz ECH System for the Stellarator W7-X

Thumm

Brand

Braune

et al. 2008

IEEE Trans. Plasma Sci.

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“…Electron cyclotron resonance heating (ECRH) is the main heating mechanism in Wendelstein 7-X [1][2][3]. The ECRH system is capable of delivering up to 5 MW at 140 GHz in the first operational phase OP1.1 and up to 9 MW in the next campaign OP1.2 scheduled for 2017.…”

Section: Introductionmentioning

confidence: 99%

Inference of the microwave absorption coefficient from stray radiation measurements in Wendelstein 7-X

et al. 2016

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The efficiency of electron cyclotron heating is determined by the microwave absorption of the plasma. Good microwave absorption is also crucial for the machine safety. In this paper we present a method of evaluating the microwave absorption coefficient from stray radiation measurements. Evolution of the X2 microwave absorption coefficient in Wendelstein 7-X during the start up phase is presented in this paper, as well as an estimate of the O2 absorption coefficient.

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“…1 Electron cyclotron resonance heating (ECRH) at 140 GHz is used as the main heating mechanism in the machine. [1][2][3][4] The ECRH system will deliver up to 10 MW of microwave power in continuous regime. 2 The ECRH system is a main source of stray radiation in Wendelstein 7-X and the contribution of ECE is negligible.…”

Section: Introductionmentioning

confidence: 99%

Absolute calibration of sniffer probes on Wendelstein 7-X

Moseev

Laqua

Marsen

et al. 2016

Review of Scientific Instruments

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Moseev, D.; Laqua, H.P.; Marsen, S.; Stange, T.; Braune, H.; Erckmann, V.; Gellert, F.J.; Oosterbeek, J.W. Published in:Review of Scientific Instruments DOI:10.1063/1.4960349Published: 01/08/2016 Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Here we report the first measurements of the power levels of stray radiation in the vacuum vessel of Wendelstein 7-X using absolutely calibrated sniffer probes. The absolute calibration is achieved by using calibrated sources of stray radiation and the implicit measurement of the quality factor of the Wendelstein 7-X empty vacuum vessel. Normalized absolute calibration coefficients agree with the cross-calibration coefficients that are obtained by the direct measurements, indicating that the measured absolute calibration coefficients and stray radiation levels in the vessel are valid. Close to the launcher, the stray radiation in the empty vessel reaches power levels up to 340 kW/m 2 per MW injected beam power. Furthest away from the launcher, i.e., half a toroidal turn, still 90 kW/m 2 per MW injected beam power is measured. [http://dx

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The W7-X ECRH Plant: Recent Achievements

Cited by 4 publications

References 6 publications

Progress in the 10-MW 140-GHz ECH System for the Stellarator W7-X

Progress in the 10-MW 140-GHz ECH System for the Stellarator W7-X

Inference of the microwave absorption coefficient from stray radiation measurements in Wendelstein 7-X

Absolute calibration of sniffer probes on Wendelstein 7-X

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