title: Influence of the dynamic ergodic divertor on the density limit in TEXTOR.
abstract: A significant influence of the dynamic ergodic divertor (DED) on the density limit in TEXTOR has been found. In Ohmic discharges, where without DED detachment normally arises at the density limit, a MARFE (multifaceted asymmetric radiation from the edge) develops when the DED is operated in a static regime. The threshold of the MARFE onset in the neutral beam heated plasmas is increased by applying 1 kHz ac DED at the high-field side. The theoretical predictions based on the parallel energy balance taking poloidal asymmetries into account agree well with the experimental observation.
authors.affiliation: Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, Association FZJ-EURATOM, 52425, Jülich Germany.
authors.forename: Y
authors.initials: Y
authors.lastname: Liang
authors.forename: H R
authors.initials: HR
authors.lastname: Koslowski
authors.forename: F A
authors.initials: FA
authors.lastname: Kelly
authors.forename: M Z
authors.initials: MZ
authors.lastname: Tokar
authors.forename: X
authors.initials: X
authors.lastname: Loozen
authors.forename: G
authors.initials: G
authors.lastname: Bertschinger
authors.forename: W
authors.initials: W
authors.lastname: Biel
authors.forename: K H
authors.initials: KH
authors.lastname: Finken
authors.forename: M W
authors.initials: MW
authors.lastname: Jakubowski
authors.forename: A
authors.initials: A
authors.lastname: Krämer-Flecken
authors.forename: O
authors.initials: O
authors.lastname: Zimmermann
authors.forename: M
authors.initials: M
authors.lastname: Lehnen
authors.forename: G
authors.initials: G
authors.lastname: Sergienko
authors.forename: R C
authors.initials: RC
authors.lastname: Wolf