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

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ;  [1]; ; ;  [2];  [3];  [1];  [4];  [5]
  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. (Germany)
  5. Institut fuer Theoretische Physik, Heinrich-Heine Universitaet Duesseldorf, D-40225 Duesseldorf (Germany)
Publication Date:
OSTI Identifier:
20955449
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevLett.98.065001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DEPOSITION; DIVERTORS; ELECTRIC POTENTIAL; MAGNETIC FIELDS; MAGNETIC FLUX; MAGNETIC ISLANDS; PLASMA; PLASMA CONFINEMENT; PLASMA DENSITY; TEXTOR TOKAMAK

Citation Formats

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., Bock, M. F. M. de, Hellermann, M. von, Jaspers, R., Kikuchi, Y., Spatschek, K. H., Institut fuer Theoretische Physik, Heinrich-Heine Universitaet Duesseldorf, D-40225 Duesseldorf, and Wingen, A. Improved Confinement due to Open Ergodic Field Lines Imposed by the Dynamic Ergodic Divertor in TEXTOR. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.065001.
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., Bock, M. F. M. de, Hellermann, M. von, Jaspers, R., Kikuchi, Y., Spatschek, K. H., Institut fuer Theoretische Physik, Heinrich-Heine Universitaet Duesseldorf, D-40225 Duesseldorf, & Wingen, A. Improved Confinement due to Open Ergodic Field Lines Imposed by the Dynamic Ergodic Divertor in TEXTOR. United States. doi:10.1103/PHYSREVLETT.98.065001.
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., Bock, M. F. M. de, Hellermann, M. von, Jaspers, R., Kikuchi, Y., Spatschek, K. H., Institut fuer Theoretische Physik, Heinrich-Heine Universitaet Duesseldorf, D-40225 Duesseldorf, and Wingen, A. Fri . "Improved Confinement due to Open Ergodic Field Lines Imposed by the Dynamic Ergodic Divertor in TEXTOR". United States. doi:10.1103/PHYSREVLETT.98.065001.
@article{osti_20955449,
title = {Improved Confinement due to Open Ergodic Field Lines Imposed by the Dynamic Ergodic Divertor in TEXTOR},
author = {Finken, K. H. and Abdullaev, S. S. and Jakubowski, M. W. and Bozhenkov, S. and Busch, C. and Kraemer-Flecken, A. and Lehnen, M. and Schega, D. and Schmitz, O. and Unterberg, B. and Wolf, R. C. and Zimmermann, O. and Bock, M. F. M. de and Hellermann, M. von and Jaspers, R. and Kikuchi, Y. and Spatschek, K. H. and Institut fuer Theoretische Physik, Heinrich-Heine Universitaet Duesseldorf, D-40225 Duesseldorf and Wingen, A.},
abstractNote = {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.},
doi = {10.1103/PHYSREVLETT.98.065001},
journal = {Physical Review Letters},
number = 6,
volume = 98,
place = {United States},
year = {Fri Feb 09 00:00:00 EST 2007},
month = {Fri Feb 09 00:00:00 EST 2007}
}