5-D simulation study of suprathermal electron transport in non-axisymmetric plasmas

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

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Abstract

ECRH driven transport of suprathermal electrons is studied in non-axisymmetric plasmas using a new Monte Carlo simulation technique in 5-D phase space. Two different phases of the ECRH driven transport of suprathermal electrons can be seen. The first is a rapid convective phase due to the direct radial motion of trapped electrons and the second 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 in W7-AS is clarified. The ECRH driven flux is also evaluated and considered in relation to 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. A possible scenario for this type of electron root is considered for the LHD plasma.

Original languageEnglish
Pages (from-to)693-700
Number of pages8
JournalNuclear Fusion
Volume40
Issue numberSPEC. ISS. 3
DOIs
Publication statusPublished - Jan 1 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Murakami, S., Gasparino, U., Idei, H., Kubo, S., Maassberg, H., Marushchenko, N., Nakajima, N., Romé, M., & Okamoto, M. (2000). 5-D simulation study of suprathermal electron transport in non-axisymmetric plasmas. Nuclear Fusion, 40(SPEC. ISS. 3), 693-700. https://doi.org/10.1088/0029-5515/40/3Y/333