Improved Confinement due to Open Ergodic Field Lines Imposed by the Dynamic Ergodic Divertor in TEXTOR

Journal Article · Fri Feb 09 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.065001· OSTI ID:20955449

Finken, K H; Abdullaev, S S; Jakubowski, M W; Bozhenkov, S; Busch, C; Kraemer-Flecken, A; Lehnen, M; Schega, D; Schmitz, O; Unterberg, B; Wolf, R C; Zimmermann, O ^[1]; Hellermann, M von; Jaspers, R ^[2]; Kikuchi, Y ^[3]; Spatschek, K H ^[1]; Wingen, A ^[4]

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1. Trilateral Euregio Cluster, Institut fuer Plasmaphysik, Forschungszentrum Juelich, EURATOM Association, D-52425 Juelich (Germany)
2. FOM Institute for Plasma Physics Rijnhuizen, EURATOM Association, Postbus 1207, NL-3430 BE Nieuwegein (Netherlands)
3. Department of Electrical Engineering and Computer Sciences, Graduate School of Engineering, University of Hyogo, 2167, Shosha, Himeji, 671-2280 Hyogo (Japan)
4. Institut fuer Theoretische Physik, Heinrich-Heine Universitaet Duesseldorf, D-40225 Duesseldorf (Germany)

The ergodization of the magnetic field lines imposed by the dynamic ergodic diverter (DED) in TEXTOR can lead both to confinement improvement and to confinement deterioration. The cases of substantial improvement are in resonant ways related to particular conditions in which magnetic flux tubes starting at the X points of induced islands are connected with the wall. This opening process is connected with a characteristic modification of the heat deposition pattern at the divertor target plate and leads to a substantial increase and steepening of the core plasma density and pressure. The improvement is tentatively attributed to a modification of the electric potential in the plasma carried by the open field lines. The confinement improvement bases on a spontaneous density built up due to the application of the DED and is primarily a particle confinement improvement.

• OSTI ID: 20955449
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DEPOSITION
DIVERTORS
ELECTRIC POTENTIAL
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC ISLANDS
PLASMA
PLASMA CONFINEMENT
PLASMA DENSITY
TEXTOR TOKAMAK