This title appears in the Scientific Report :
2009
Please use the identifier:
http://dx.doi.org/10.1016/j.jnucmat.2009.01.149 in citations.
Particle confinement control with external resonant magnetic perturbations at TEXTOR
Particle confinement control with external resonant magnetic perturbations at TEXTOR
Two very contrary particle confinement stages were obtained at TEXTOR-DED by application of resonant magnetic perturbations. On the one hand a spontaneous build up of the total number of particles N-tot with correlated increase in the particle confinement time tau(p) was observed and on the other ha...
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Personal Name(s): | Schmitz, O. |
---|---|
Coenen, J. W. / Frerichs, H. / Kantor, M. / Lehnen, M. / Unterberg, B. / Brezinsek, S. / Clever, M. / Evans, T. / Finken, K. H. / Jakubowski, M. W. / Philipps, V. / Reiter, D. / Samm, U. / Spakman, G.W. / Telesca, G. | |
Contributing Institute: |
Plasmaphysik; IEF-4 JARA - HPC; JARA-HPC Jülich-Aachen Research Alliance - Energy; JARA-ENERGY |
Published in: | Journal of nuclear materials, 390-391 (2009) |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2009
|
DOI: |
10.1016/j.jnucmat.2009.01.149 |
Document Type: |
Journal Article |
Research Program: |
Fusion |
Series Title: |
Journal of Nuclear Materials
390-391 |
Subject (ZB): | |
Publikationsportal JuSER |
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520 | |a Two very contrary particle confinement stages were obtained at TEXTOR-DED by application of resonant magnetic perturbations. On the one hand a spontaneous build up of the total number of particles N-tot with correlated increase in the particle confinement time tau(p) was observed and on the other hand a controlled decrease of N-tot and tau(p) - the so called stochastic particle pump out is seen. Numerical analysis of the perturbed magnetic field topology shows that both domains can be distinguished by the ratio of short connection length field lines touching a specific resonant flux surface (here the q = 5/2 surface) to the complete perturbed layer width. During improved particle confinement, the hyperbolic fixed points (X-points) of the pitch resonant islands are directly connected to the DED target followed by an less than or similar to 40% increase in tau(p). The subsequent increase in the E x B shear rate Omega(ExB) at the q = 5/2 surface and a steepening of del n(e)(r) suggests a reduction of the radial particle transport. On the opposite, complete stochastisation of this island chain, i.e. a predominant diffusive field line characteristics, causes a less than or similar to 30% decrease of tau(p) with a reduction in Omega(ExB) at the q = 5/2 surface and del n(e)(r) indicating enhanced effective outward particle transport. (C) 2009 Elsevier B.V. All rights reserved. | ||
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