This title appears in the Scientific Report :
2007
Please use the identifier:
http://dx.doi.org/10.1088/0029-5515/47/7/004 in citations.
Please use the identifier: http://hdl.handle.net/2128/3624 in citations.
Influence of the dynamic ergodic divertor on transport properties in TEXTOR
Influence of the dynamic ergodic divertor on transport properties in TEXTOR
Experiments to investigate transport properties under the influence of the dynamic ergodic divertor (DED) on TEXTOR are discussed. Relativistic runaway electrons are applied for studying transport properties of ergodization such as enhanced runaway loss. The ergodization causes an enhanced loss rate...
Saved in:
Personal Name(s): | Finken, K. H. |
---|---|
Unterberg, B. / Xu, Y. / Abdullaev, S. S. / Jakubowski, M. W. / Lehnen, M. / de Bock, M. F. M. / Bozhenkov, S. A. / Brezinsek, S. / Busch, C. / Classen, I. G. J. / Coenen, J. W. / Harting, D. / von Hellermann, M. / Jachmich, S. / Jaspers, R. J. E. / Kikuchi, Y. / Krämer-Flecken, A. / Liang, Y. / Mitri, M. / Peleman, P. / Pospieszczyk, A. / Reiser, D. / Reiter, D. / Samm, U. / Schega, D. / Schmitz, O. / Soldatov, S. / Van Schoor, M. / Vergote, M. / Weynants, R. R. / Wolf, R. / Zimmermann, O. | |
Contributing Institute: |
Plasmaphysik; IEF-4 Jülich-Aachen Research Alliance - Simulation Sciences; JARA-SIM JARA-ENERGY; JARA-ENERGY |
Published in: | Nuclear fusion, 47 (2007) S. 522 - 534 |
Imprint: |
Vienna
IAEA
2007
|
Physical Description: |
522 - 534 |
DOI: |
10.1088/0029-5515/47/7/004 |
Document Type: |
Journal Article |
Research Program: |
Fusion |
Series Title: |
Nuclear Fusion
47 |
Subject (ZB): | |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/3624 in citations.
Experiments to investigate transport properties under the influence of the dynamic ergodic divertor (DED) on TEXTOR are discussed. Relativistic runaway electrons are applied for studying transport properties of ergodization such as enhanced runaway loss. The ergodization causes an enhanced loss rate; this loss is higher for low relativistic electrons than for highly relativistic ones, in good agreement with particle orbit mapping. Edge transport can be controlled by the DED perturbation: in limiter H-mode plasmas ELM-like particle and heat bursts associated with the formation of enhanced edge pressure gradients are mitigated in the 6/2 configuration on the expense of a reduced pedestal height. Finally, the plasma is driven back to L-mode under the influence of the magnetic perturbation. In the 3/1 configuration the onset of tearing modes limits the possibility to affect edge transport. A mode of spontaneous density built-up has been found for the TEXTOR-DED as well. This mode is in particular strong for an inward shifted plasma; the built-up has a resonant character with respect to q (a). Langmuir probe measurements with two probe arrays show a strong influence of the magnetic ergodization on both the edge plasma equilibrium and fluctuation parameters. In particular, in the ergodic zone the turbulence properties and turbulence-driven flux are profoundly modified. |