(EXP5/14) Results from Transient Transport Experiments in Rijnhuizen Tokamak
Project: Heat Convection, Transport Barriers and `Non-local' Effects
P. Mantica1), G. Gorini1)2),
G. M. D. Hogeweij3), J. de Kloe3),
N. J. Lopes Cardozo3), A. M. R. Schilham3)
1) Istituto di Fisica del Plasma `P.Caldirola',
Associazione Euratom-ENEA-CNR, Milano, Italy
2) INFM and Dipartimento di Fisica `G.Occhialini',
Universitá degli Studi di Milano-Bicocca, Milano, Italy
3) FOM Instituut voor Plasmafysica `Rijnhuizen', Associatie
Euratom-FOM, Trilateral Euregio Cluster, 3430 BE Nieuwegein, The
Netherlands
Abstract. An overview of experimental transport studies performed on the
Rijnhuizen Tokamak Project (RTP) using transient transport techniques in
both Ohmic and ECH dominated plasmas is presented. Modulated Electron
Cyclotron Heating (ECH) and oblique pellet injection (OPI) have been used to
induce electron temperature (
Te) perturbations at different radial
locations. These were used to probe the electron transport barriers observed
near low order rational magnetic surfaces in ECH dominated steady-state RTP
plasmas. Layers of inward electron heat convection in off-axis ECH plasmas
were detected with modulated ECH. This suggests that RTP electron transport
barriers consist of heat pinch layers rather than layers of low thermal
diffusivity. In a different set of experiments, OPI triggered a transient
rise of the core
Te due to an increase of the
Te gradient in
the
