Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Author	H. S. Bosch R C Wolf T. Andreeva J. Baldzuhn D. Birus T. Bluhm T. Brauer H. Braune V. Bykov A. Cardella F. Durodie M. Endler V. Erckmann G. Gantenbein D. Hartmann D. Hathiramani P. Heimann B. Heinemann C. Hennig M. Hirsch D. Holtum J. Jagielski J. Jelonnek W. Kasparek T. Klinger R. Konig P. Kornejew H. Kroiss J. G. Krom G. Kuhner H. Laqua H. P. Laqua C. Lechte M. Lewerentz J. Maier P. McNeely A. Messiaen G. Michel J. Ongena A. Peacock T. S. Pedersen R. Riedl H. Riemann P. Rong N. Rust J. Schacht F. Schauer R. Schroeder B. Schweer A. Spring A. Stabler M. Thumm Y. Turkin L. Wegener A. Werner D. Zhang M. Zilker T. Akijama R. Alzbutas E. Ascasibar M. Balden M. Banduch C. Baylard W. Behr C. Beidler A. Benndorf T. Bergmann C. Biedermann B. Bieg W. Biel M. Borchardt G. Borowitz V. Borsuk S. Bozhenkov R. Brakel H. Brand T. Brown B. Brucker R. Burhenn K. P. Buscher C. Caldwell-Nichols A. Cappa A. Cardella A. Carls P. Carvalho L. Ciupinski M. Cole J. Collienne A. Czarnecka G. Czymek G. Dammertz C. P. Dhard V. I. Davydenko A. Dinklage M. Drevlak S. Drotziger A. Dudek P. Dumortier G. Dundulis P. von Eeten K. Egorov T. Estrada H. Faugel J. Fellinger Y. Feng H. Fernandes W. H. Fietz W. Figacz F. Fischer J. Fontdecaba A. Freund T. Funaba H. Funfgelder A. Galkowski D. Gates L. Giannone J. M. G. Regana J. Geiger S. Geissler H. Greuner M. Grahl S. Gross A. Grosman H. Grote O. Grulke R. Jaspers V. Szabo
Abstract	The next step in the Wendelstein stellarator line is the large superconducting device Wendelstein 7-X, currently under construction in Greifswald, Germany. Steady-state operation is an intrinsic feature of stellarators, and one key element of the Wendelstein 7-X mission is to demonstrate steady-state operation under plasma conditions relevant for a fusion power plant. Steady-state operation of a fusion device, on the one hand, requires the implementation of special technologies, giving rise to technical challenges during the design, fabrication and assembly of such a device. On the other hand, also the physics development of steady-state operation at high plasma performance poses a challenge and careful preparation. The electron cyclotron resonance heating system, diagnostics, experiment control and data acquisition are prepared for plasma operation lasting 30 min. This requires many new technological approaches for plasma heating and diagnostics as well as new concepts for experiment control and data acquisition.
Year of Publication	2013
Journal	Nuclear Fusion
Volume	53
Number	12
Number of Pages	126001
Date Published	Dec
ISBN Number	0029-5515
URL	http://iopscience.iop.org/0029-5515/53/12/126001/
DOI	10.1088/0029-5515/53/12/126001
PId	9ec4f6d15344384bf80d916052633c5f
Alternate Journal	Nucl. Fusion
	Journal Article
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