NIFS-576

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Author(s):

S. Murakami, U. Gasparino, H. Idei, S. Kubo, H. Maassberg, N. Marushchenko, N. Nakajima, M. Rome and M. Okamoto

Title:

5D Simulation Study of Suprathermal Electron Transport in Non-Axisymmetric Plasmas

Date of publication:

Oct. 1998

Key words:

IAEA, fusion energy conference, Yokohama

Abstract:

ECRH-driven transport of suprathermal electrons is studied in non-axisymmetric plasmas 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; the first one is a rapid convective phase due to the direct radial motion of trapped electrons and the second one is a slower phase due to the collisional transport. The important role of the radial transport of suprathemal electrons in the broadening of the ECRH deposition profile in W7-AS is clarified. 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 supratherrnal electrons. The possible scenario of this "ECRH-driven electron root" is considered in the LHD plasma. ..

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