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Return To: Session TH2 - Theory 2 (Thursday, 22 October)
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Next Page: (TH2/3) High and Low Frequency Alfvén Modes in
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S. Murakami , U. Gasparino 1, H. Idei ,
S. Kubo , H. Maassberg 1, N. Marushchenko 2,
N. Nakajima , M. Romé 1* and M. Okamoto
National Institute for Fusion Science, 322-6 Oroshi,
Toki 509-5292, Japan
1 Max-Planck-Institut für Plasmaphysik, EURATOM Ass., D-85748
Garching, Germany
2 Institute of Plasma Physics, NSC-KhPTI, 310108 Kharkov, Ukraine
* Present address: INFM and Dipartimento di Fisica, Universitá degli
Studi di Milano, Milano, Italy
Abstract
ECRH-driven transport of is studied in
using a new Monte Carlo simulation technique in 5D
phase space. Two different phases of the ECRH-driven transport of
suprathermal electrons can be seen; one is a rapid convective phase due to
the direct radial motion of trapped electrons and the other is a slower
phase due to the collisional transport. The important role of the radial
transport of suprathermal electrons in the broadening of the ECRH deposition
profile is clarified in W7-AS . The ECRH driven flux is also evaluated and
put in relation with the ``electron root'' feature recently observed in
W7-AS. It is found that, at low collisionalities, the ECRH driven flux due
to the suprathermal electrons can play a dominant role in the condition of
ambipolarity and, thus, the observed ``electron root'' feature in W7-AS is
thought to be driven by the radial (convective) flux of ECRH generated
suprathermal electrons. The possible scenario of this ``ECRH-driven electron
root'' is considered in the LHD plasma.
IAEA 1999