Guiding Center Orbit Calculation for Evaluating the Current Density Distributions of the Electrons in Electron Cyclotron Heating on QUEST

Md Mahbub Alam, Kazuo Nakamura, Hiroshi Idei, Makoto Hasegawa, Kazutoshi Tokunaga, Kuniaki Araki, Kazuaki Hanada, Akihide Fujisawa, Yoshihiko Nagashima, Shoji Kawasaki, Hisatoshi Nakashima, Aki Higashijima, Fan Xia, Osamu Mitarai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In order to evaluate the magnetic surface current density distributions, the electron guiding center orbits were calculated with the equilibrium fitting plasma equilibrium analysis. The current density distributions in electron cyclotron-heated plasma were estimated from the orbit analyses in the equilibrium plasma shaping for the fundamental and the second-harmonic resonant electrons separately. The current density distribution profiles on the equatorial plane were obtained for the electrons with initially positive and negative velocities parallel to the magnetic field direction as well as the trapped electrons. The surface averaged current density profiles of the closed flux surfaces were also evaluated. A significant amount of the positive current density distributions appeared outside the last closed flux surface (LCFS), while all the negative current density distributions were evaluated inside the LCFS. The trapped electrons being the second-harmonic electron cyclotron resonant contributed the negative current inside the LCFS. The positive current density distributions outside the LCFS were significant for the driven current density for both the fundamental and second-harmonic resonances.

Original languageEnglish
Article number7482769
Pages (from-to)1666-1671
Number of pages6
JournalIEEE Transactions on Plasma Science
Volume44
Issue number9
DOIs
Publication statusPublished - Sep 2016

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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