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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-234D-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-234E-F
Genre: Journal Article

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 Creators:
Giannone, L.1, Author              
Brakel, R.2, Author              
Burhenn, R.3, 4, Author              
Ehmler, H.3, 5, Author              
Feng, Y.4, 6, Author              
Grigull, P.7, Author              
McCormick, K.4, 5, Author              
Wagner, F.2, Author              
Baldzuhn, J.8, Author              
Igitkhanov, Y.9, Author              
Knauer, J.8, Author              
Nishimura, K.10, Author
Pasch, E.11, Author              
Peterson, B. J.10, Author
Narayanan, R.12, Author              
Rust, N.13, Author              
Weller, A.5, Author              
Werner, A.7, Author              
W7-AS Team14, Author
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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 Abstract: 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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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Plasma Physics and Controlled Fusion
  Alternative Title : Plasma Phys. Control. Fusion
Source Genre: Journal
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Publ. Info: Copyright©Institute of Physics and IOP Publishing Ltd 2003
Pages: - Volume / Issue: 45 (9) Sequence Number: - Start / End Page: 1713 - 1731 Identifier: -