title: Simultaneous attainment of high electron and ion temperatures in discharges with internal transport barriers in ASDEX upgrade
abstract: Internal transport barriers have been demonstrated to exist also under conditions with T(e) approximately T(i) approximately 10 keV and predominant electron heating of the tokamak core region. Central electron cyclotron heating was added to neutral beam injection-heated ASDEX Upgrade discharges with a preexisting internal transport barrier, established through programmed current ramping leading to shear reversal. Compared to a reference internal transport barrier discharge without electron cyclotron resonance heating, the electron heat conductivity in the barrier region was found not to increase, in spite of a fivefold increase in electron heat flux, and also angular momentum and ion energy transport did not deteriorate.
authors.affiliation: Max-Planck-Institut fur Plasmaphysik, EURATOM-Association, Garching, Germany.
authors.initials: S
authors.lastname: Gunter
authors.initials: RC
authors.lastname: Wolf
authors.initials: F
authors.lastname: Leuterer
authors.initials: O
authors.lastname: Gruber
authors.initials: M
authors.lastname: Kaufmann
authors.initials: K
authors.lastname: Lackner
authors.initials: M
authors.lastname: Maraschek
authors.lastname: Mc Carthy PJ
authors.initials: H
authors.lastname: Meister
authors.initials: A
authors.lastname: Peeters
authors.initials: G
authors.lastname: Pereverzev
authors.initials: H
authors.lastname: Salzmann
authors.initials: S
authors.lastname: Schade
authors.initials: J
authors.lastname: Schweinzer
authors.initials: W
authors.lastname: Suttrop