This title appears in the Scientific Report :
2005
Please use the identifier:
http://hdl.handle.net/2128/503 in citations.
Please use the identifier: http://dx.doi.org/10.1088/0741-3335/47/12B/S18 in citations.
Transport and divertor properties of the Dynamic Ergodic Divertor
Transport and divertor properties of the Dynamic Ergodic Divertor
The concept of the dynamic ergodic divertor (DED) is based on plasma edge ergodization by a resonant perturbation. Such a divertor concept is closely related to helical or island divertors in stellerators. The base mode of the DED perturbation field can be m/n = 12/4, 6/2 or 3/1. The 3/1 base mode w...
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Personal Name(s): | Lehnen, M. |
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Abdullaev, S. S. / Biel, W. / de Bock, M. F. M. / Brezinsek, S. / Busch, C. / Classen, I. / Finken, K. H. / Harting, D. / von Hellermann, M. / Jachmich, S. / Jakubowski, M. W. / Jaspers, R. / Koslowski, H. R. / Krämer-Flecken, A. / Kikuchi, Y. / Liang, Y. / Loozen, X. / Pospieszczyk, A. / van Rumpuy, T. / Reiter, D. / Samm, U. / Schmitz, O. / Sergienko, G. / Tokar, M. / Unterberg, B. / Wolf, R. / Zimmermann, O. | |
Contributing Institute: |
Institut für Plasmaphysik; IPP |
Published in: | Plasma physics and controlled fusion, 47 (2005) S. B237 - B248 |
Imprint: |
Bristol
IOP Publ.
2005
|
Physical Description: |
B237 - B248 |
DOI: |
10.1088/0741-3335/47/12B/S18 |
Document Type: |
Journal Article |
Research Program: |
Kernfusion und Plasmaforschung |
Series Title: |
Plasma Physics and Controlled Fusion
47 |
Subject (ZB): | |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1088/0741-3335/47/12B/S18 in citations.
The concept of the dynamic ergodic divertor (DED) is based on plasma edge ergodization by a resonant perturbation. Such a divertor concept is closely related to helical or island divertors in stellerators. The base mode of the DED perturbation field can be m/n = 12/4, 6/2 or 3/1. The 3/1 base mode with its deep penetration of the perturbation field provides the excitation of tearing modes. This topic was presented elsewhere. In this contribution we concentrate on the divertor properties of the DED. We report on the characterization of the topology, transport properties in ergodic fields, impurity transport and density limit behaviour.The 12/4 base where the perturbation is restricted to the plasma edge is suitable for divertor operation. With increasing perturbation field island chains are built up at the resonance layers. Overlapping islands lead to ergodization. The plasma is guided in the laminar region via open field lines of short connection length to the divertor target. The magnetic topology is not only controlled by the coil current but especially by the edge safety factor. For appropriate edge safety factor we observe a strong temperature drop in the plasma edge, indicating an expansion of the laminar region, which is necessary to decouple the divertor plasma from the core plasma. The modifications of the magnetic topology can be directly seen, for example, from carbon emission lines. The magnetic structure is calculated by the ATLAS code and shows good agreement with the experimental findings. |