Improved Confinement due to Open Ergodic Field Lines Imposed by the Dynamic Ergodic Divertor in TEXTOR
- Trilateral Euregio Cluster, Institut fuer Plasmaphysik, Forschungszentrum Juelich, EURATOM Association, D-52425 Juelich (Germany)
- FOM Institute for Plasma Physics Rijnhuizen, EURATOM Association, Postbus 1207, NL-3430 BE Nieuwegein (Netherlands)
- Department of Electrical Engineering and Computer Sciences, Graduate School of Engineering, University of Hyogo, 2167, Shosha, Himeji, 671-2280 Hyogo (Japan)
- 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, Vol. 98, Issue 6; Other Information: DOI: 10.1103/PhysRevLett.98.065001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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