X ray observations of central toroidal rotation in ohmic alcator C-mod plasmas

J.E. Rice, E.S. Marmar, F. Bombarda, L. Qu

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Impurity toroidal rotation has been observed in the centre of ohmic plasmas in the Alcator C-Mod tokamak from the Doppler shifts of argon and molybdenum X ray lines. The rotation is highest (∼ 6 × 10 6 cm/s) in the early portion of the discharges, when the loop voltage is highest and the electron density is lowest, and then typically settles to values ≤ 2 × 10 6 cm/s during the steady state period. The impurity rotation is in the same direction as the electron toroidal drift, opposite to the plasma current, and reverses direction when the plasma current direction is reversed. Molybdenum and argon ions rotate with the same velocity. These observations are in qualitative agreement with neoclassical theory.
Original languageEnglish
Pages (from-to)421 - 426
Number of pages6
JournalNuclear Fusion
Issue number3
Publication statusPublished - Mar 1997
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Nuclear and High Energy Physics

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