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

Content Provider	IEEE Xplore Digital Library
Author	Thumm, M. Brand, P. Braune, H. Dammertz, G. Erckmann, V. Gantenbein, G. Illy, S. Kasparek, W. Laqua, H.P. Lechte, C. Leonhardt, W. Michel, G. Neffe, G. Piosczyk, B. Schmid, M. Weissgerber, M.
Copyright Year	1973
Abstract	During the last years, electron cyclotron heating (ECH) was proven to be one of the most attractive heating schemes for stellarators because it provides net-current-free plasma startup and heating. Both the stellarator Wendelstein 7-X (W7-X), which is under construction at the Max-Planck-Institut fu umlr Plasmaphysik, Greifswald, Germany, and the International Thermonuclear Experimental Reactor (ITER) tokamak, which will be built in Cadarache, France, will be equipped with a strong ECH and current-drive system. Both systems are comparable in frequency and have continuous-wave capability (140 GHz, 10 MW for W7-X and 170 GHz, 24 MW for ITER). The commissioning of the ECH plant for W7-X is well underway; the status of the project and the first integrated full-power test results from two modules are reported and may provide valuable input for the ITER plant. The ten gyrotrons at W7-X will be arranged in two subgroups symmetrically to a central beam duct in the ECH hall. The RF wave of each subgroup will be combined and transmitted by a purely optical multibeam-waveguide (MBWG) transmission line from the gyrotrons to the torus. The combination of five 1 MW gyrotron beams to one beam line with a power of 5 MW reduces the complexity of the system considerably. The single- and MBWG mirrors and the polarizers have been manufactured. Cold tests of a full-size uncooled prototype line delivered an efficiency exceeding 90%. The microwave power will be launched to the plasma through ten chemical-vapor-deposited-diamond barrier windows and in-vessel quasi-optical plug-in launchers, allowing each 1-MW RF beam to be steered independently. The polarization, as well as the poloidal and toroidal launch angles, will be adjusted individually to provide optimum conditions for different heating and current-drive scenarios.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	341
Ending Page	355
Page Count	15
File Size	1917258
File Format	PDF
ISSN	00933813
Volume Number	36
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heating Structural beams Gyrotrons Plasmas Testing Radio frequency Electrons Cyclotrons Inductors Tokamaks stellarator Electron cyclotron heating (ECH) high-power continuous-wave (CW) gyrotron quasi-optical transmission
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Development of a 140-GHz 1-MW continuous wave gyrotron for the W7-X stellarator

2.2-MW Record Power of the 170-GHz European Preprototype Coaxial-Cavity Gyrotron for ITER

RF Behavior of a 200-kW CW Gyrotron

ECRH and ECCD with high power gyrotrons at the stellarators W7-AS and W7-X

Recent Advances in the Worldwide Fusion Gyrotron Development

Mode Selection and Coaxial Cavity Design for a 4-MW 170-GHz Gyrotron, Including Thermal Aspects

Experimental Verification of Phase Retrieval of Quasi-Optical Millimeter-Wave Beams

42-GHz 0.5-MW ECRH System for Tokamaks SST-1 and Aditya

140-GHz gyrotron with multimegawatt output power

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

Similar Documents

Development of a 140-GHz 1-MW continuous wave gyrotron for the W7-X stellarator

2.2-MW Record Power of the 170-GHz European Preprototype Coaxial-Cavity Gyrotron for ITER

RF Behavior of a 200-kW CW Gyrotron

ECRH and ECCD with high power gyrotrons at the stellarators W7-AS and W7-X

Recent Advances in the Worldwide Fusion Gyrotron Development

Mode Selection and Coaxial Cavity Design for a 4-MW 170-GHz Gyrotron, Including Thermal Aspects

Experimental Verification of Phase Retrieval of Quasi-Optical Millimeter-Wave Beams

42-GHz 0.5-MW ECRH System for Tokamaks SST-1 and Aditya

140-GHz gyrotron with multimegawatt output power

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