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.affiliation: Trilateral Euregio Cluster, Institut für Plasmaphysik, Forschungszentrum Jülich, EURATOM Association, D-52425 Jülich, Germany.
authors.forename: K H
authors.initials: KH
authors.lastname: Finken
authors.forename: S S
authors.initials: SS
authors.lastname: Abdullaev
authors.forename: M W
authors.initials: MW
authors.lastname: Jakubowski
authors.forename: M F M
authors.initials: MF
authors.lastname: de Bock
authors.forename: S
authors.initials: S
authors.lastname: Bozhenkov
authors.forename: C
authors.initials: C
authors.lastname: Busch
authors.forename: M
authors.initials: M
authors.lastname: von Hellermann
authors.forename: R
authors.initials: R
authors.lastname: Jaspers
authors.forename: Y
authors.initials: Y
authors.lastname: Kikuchi
authors.forename: A
authors.initials: A
authors.lastname: Krämer-Flecken
authors.forename: M
authors.initials: M
authors.lastname: Lehnen
authors.forename: D
authors.initials: D
authors.lastname: Schega
authors.forename: O
authors.initials: O
authors.lastname: Schmitz
authors.forename: K H
authors.initials: KH
authors.lastname: Spatschek
authors.forename: B
authors.initials: B
authors.lastname: Unterberg
authors.forename: A
authors.initials: A
authors.lastname: Wingen
authors.forename: R C
authors.initials: RC
authors.lastname: Wolf
authors.forename: O
authors.initials: O
authors.lastname: Zimmermann