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Title: The Optimization of the Ergodic Structure of the Dynamic Ergodic Divertor In The TEXTOR Tokamak

Abstract

The dynamic ergodic divertor (DED) in TEXTOR is designed to provide a perturbed volume in the plasma edge in order to control heat and particle exhaust. The stochastic boundary layer is generated in the outermost region of the plasma, which can be divided into ergodic and laminar regions. The topology of the magnetic field is substantial for the transport properties and plasma parameters. It is expected that the formation of the proper laminar zone allows decoupling the plasma edge from the core. Due to enhancement of the radial electron heat transport in the ergodic region the electron temperature in the plasma boundary is reduced. Therefore one needs to find the proper ratio of the ergodic and laminar zone, which gives optimal performance of the divertor. The structure of the perturbed volume strongly depends on the safety factor profile and the plasma pressure. At the higher level of ergodization (i.e. at higher plasma current and lower beta poloidal) the laminar zone is dominant, while at the lower level of ergodization the ergodic region is more important. The topology of the perturbed volume is modeled with the ATLAS-code and basing on the results of modeling the experiments are performed and compared tomore » the calculated structures.« less

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Institut fuer Plasmaphysik, Forschungszentrum Juelich, Association Euratom-FZJ, Trilateral Euregio Cluster, D-52425 Juelich (Germany)
Publication Date:
OSTI Identifier:
20797895
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 812; Journal Issue: 1; Conference: PLASMA 2005: International conference on research and applications of plasmas; 3. German-Polish conference on plasma diagnostics for fusion and applications; 5. French-Polish seminar on thermal plasma in space and laboratory, Opole-Turawa (Poland), 6-9 Sep 2005; Other Information: DOI: 10.1063/1.2168821; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; A CODES; BOUNDARY LAYERS; COMPUTERIZED SIMULATION; CONTROL; DECOUPLING; ELECTRIC CURRENTS; ELECTRON TEMPERATURE; ELECTRONS; ERGODIC DIVERTORS; HEAT TRANSFER; MAGNETIC FIELDS; OPTIMIZATION; PLASMA; PLASMA PRESSURE; PLASMA SIMULATION; RADIATION TRANSPORT; TEXTOR TOKAMAK; TOPOLOGY

Citation Formats

Jakubowski, M. W., Abdullaev, S. S., Finken, K. H., Kikuchi, Y., Kraemer-Flecken, A., Lehnen, M., Schmitz, O., Unterberg, B., and Wolf, R. C. The Optimization of the Ergodic Structure of the Dynamic Ergodic Divertor In The TEXTOR Tokamak. United States: N. p., 2006. Web. doi:10.1063/1.2168821.
Jakubowski, M. W., Abdullaev, S. S., Finken, K. H., Kikuchi, Y., Kraemer-Flecken, A., Lehnen, M., Schmitz, O., Unterberg, B., & Wolf, R. C. The Optimization of the Ergodic Structure of the Dynamic Ergodic Divertor In The TEXTOR Tokamak. United States. doi:10.1063/1.2168821.
Jakubowski, M. W., Abdullaev, S. S., Finken, K. H., Kikuchi, Y., Kraemer-Flecken, A., Lehnen, M., Schmitz, O., Unterberg, B., and Wolf, R. C. Sun . "The Optimization of the Ergodic Structure of the Dynamic Ergodic Divertor In The TEXTOR Tokamak". United States. doi:10.1063/1.2168821.
@article{osti_20797895,
title = {The Optimization of the Ergodic Structure of the Dynamic Ergodic Divertor In The TEXTOR Tokamak},
author = {Jakubowski, M. W. and Abdullaev, S. S. and Finken, K. H. and Kikuchi, Y. and Kraemer-Flecken, A. and Lehnen, M. and Schmitz, O. and Unterberg, B. and Wolf, R. C.},
abstractNote = {The dynamic ergodic divertor (DED) in TEXTOR is designed to provide a perturbed volume in the plasma edge in order to control heat and particle exhaust. The stochastic boundary layer is generated in the outermost region of the plasma, which can be divided into ergodic and laminar regions. The topology of the magnetic field is substantial for the transport properties and plasma parameters. It is expected that the formation of the proper laminar zone allows decoupling the plasma edge from the core. Due to enhancement of the radial electron heat transport in the ergodic region the electron temperature in the plasma boundary is reduced. Therefore one needs to find the proper ratio of the ergodic and laminar zone, which gives optimal performance of the divertor. The structure of the perturbed volume strongly depends on the safety factor profile and the plasma pressure. At the higher level of ergodization (i.e. at higher plasma current and lower beta poloidal) the laminar zone is dominant, while at the lower level of ergodization the ergodic region is more important. The topology of the perturbed volume is modeled with the ATLAS-code and basing on the results of modeling the experiments are performed and compared to the calculated structures.},
doi = {10.1063/1.2168821},
journal = {AIP Conference Proceedings},
number = 1,
volume = 812,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}