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(TH2/1) 5D Simulation Study of Suprathermal Electron Transport in Non-Axisymmetric Plasmas

S. Murakami, U. Gasparino¹, H. Idei, S. Kubo, H. Maassberg¹, N. Marushchenko², 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.

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