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M. Willensdorfer, E. Wolfrum, F. Aumayr, R. Fischer, B. Nold, P. Sauter, A. Scarabosio, P. Schneider, B. Sieglin, . ASDEX Upgrade Team:
"Pedestal formation after L-H transition in ASDEX Upgrade";
Proc. 38th EPS Conference on Plasma Physics, ISBN 2-914771-68-1, Strasbourg, France, 27.6 - 1.7.2011, Europhys. Conf. Abstracts, 35G (2011), P5.072; 1 - 4.

Introduction
The H-mode is the foreseen standard scenario for ITER. The initially installed heating power
of ITER is expected to be around the H-mode power threshold of the initial H2 or He plasma
operation [1]. Therefore, the achievement of a sustained H-mode will be very sensitive to the
development of the pedestal for heating powers close to the power threshold (PHeat/PThres ' 1).
Figure 1: The plasma and divertor current (a & b), the heating
power (c & d), the gas fuelling and the line integrated density
(e & f) for both discharges (#25438 & #25440) are shown. Red
shaded areas indicate H-mode phases.
The ASDEX Upgrade tokamak is
well equipped with plasma edge diagnostics,
which deliver routinely
detailed electron density and temperature
measurements with a high
spatial and temporal resolution.
Within the available heating scenarios,
it is even possible to achieve Hmode
using electron cyclotron resonance
heating (ECRH) only. In
contrast to neutral beam heating
(NBI), ECRH is not accompanied
with a particle source in the confined
plasma.