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  Bolometer tomography at the density limit of the HDH mode in the W7-AS stellarator

Giannone, L., Brakel, R., Burhenn, R., Ehmler, H., Feng, Y., Grigull, P., et al. (2003). Bolometer tomography at the density limit of the HDH mode in the W7-AS stellarator. Plasma Physics and Controlled Fusion, 45(9), 1713-1731. doi:10.1088/0741-3335/45/9/310.

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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-234D-2 Versions-Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-234E-F
Genre: Zeitschriftenartikel

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 Urheber:
Giannone, L.1, Autor           
Brakel, R.2, Autor           
Burhenn, R.3, 4, Autor           
Ehmler, H.3, 5, Autor           
Feng, Y.4, 6, Autor           
Grigull, P.7, Autor           
McCormick, K.4, 5, Autor           
Wagner, F.2, Autor           
Baldzuhn, J.8, Autor           
Igitkhanov, Y.9, Autor           
Knauer, J.8, Autor           
Nishimura, K.10, Autor
Pasch, E.11, Autor           
Peterson, B. J.10, Autor
Narayanan, R.12, Autor           
Rust, N.13, Autor           
Weller, A.5, Autor           
Werner, A.7, Autor           
W7-AS Team14, Autor
Affiliations:
1Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
2Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
3VINETA, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856311              
4W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              
5Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856285              
6W7-X: Theory, Max Planck Institute for Plasma Physics, Max Planck Society
7W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
8External Organizations, ou_persistent22              
9Stellarator System Studies, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856331              
10National Institute for Fusion Science, Toki 509-5292, Japan, ou_persistent22              
11Stellarator Optimisation (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856329              
12Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              
13W7-X: Heating (HT), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856343              
14Max Planck Society, ou_persistent13              

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 Zusammenfassung: The installation of divertor plates in the W7-AS stellarator has allowed attainment of a high energy confinement regime at high density, where the radiation profiles reached steady state. In this regime, the radial profile of the radiated power is hollow. Raising the density to the point where the radiated power approached the input power led to plasma detachment and a decrease in diamagnetic energy. This defines the density limit in a stellarator and a scaling law for this maximum density can be heuristically derived on the basis of power balance considerations. The installation of two bolometer cameras away from the divertor plates and three bolometer cameras in the vicinity of the divertor plates has provided insight into the features of high density operation of a divertor in a stellarator. In the main chamber, tomographic inversion at the density limit has shown that a poloidally asymmetric radiation profile developed as the density limit was approached. In the divertor, radiation in front of the divertor plates occurred while the plasma was attached and this radiation zone vanished at plasma detachment. Steady state discharges of up to 1.5 s have been achieved for neutral beam injection power of up to 2 MW. A precursor to a spontaneous transition out of the high confinement regime has been identified.

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Sprache(n): eng - English
 Datum: 2003
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 55953
DOI: 10.1088/0741-3335/45/9/310
URI: http://stacks.iop.org/0741-3335/45/1713
 Art des Abschluß: -

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Titel: Plasma Physics and Controlled Fusion
  Alternativer Titel : Plasma Phys. Control. Fusion
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Copyright©Institute of Physics and IOP Publishing Ltd 2003
Seiten: - Band / Heft: 45 (9) Artikelnummer: - Start- / Endseite: 1713 - 1731 Identifikator: -