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

Journal Article · Sun Jan 15 00:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2168821· OSTI ID:20797895

Jakubowski, M W; Abdullaev, S S; Finken, K H; Kikuchi, Y; Kraemer-Flecken, A; Lehnen, M; Schmitz, O; Unterberg, B; Wolf, R C ^[1]

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1. Institut fuer Plasmaphysik, Forschungszentrum Juelich, Association Euratom-FZJ, Trilateral Euregio Cluster, D-52425 Juelich (Germany)

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.

• OSTI ID: 20797895
• Journal Information: AIP Conference Proceedings, Vol. 812, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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