Toroidal plasma rotation in the plt tokamak with neutral-beam injection

S. Suckewer, H. P. Eubank, Robert James Goldston, J. McEnerney, N. R. Sauthoff, H. H. Towner

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Toroidal plasma rotation in the Princeton Large Torus, PLT, has been measured for various plasma and neutral-beam injection conditions. Measurements of the plasma rotational velocities were made from Doppler shifts of appropriate spectra lines and include data from both hydrogen and deuterium beams and co- and counter-injection at several electron densities. Without injection, a small but consistent toroidal rotation exists in a direction opposite to the plasma current (counter-direction) in the plasma centre but parallel to the current (co-direction) in the plasma periphery. Using these velocities measured in the absence of injection, and the plasma density and temperature gradients, radial electron fields can be determined from theory, giving Er≈ 40 the plasma centre and Er≈ 10 the plasma edge. Insertion of a local, 2.5% magnetic well produced no observable effect on the beam-driven rotation. Modelling of the time evolution and radial distribution of the rotation allows one to deduce an effective momentum diffusivity of the order of (1–5) X 104cm2.

Original languageEnglish (US)
Pages (from-to)1301-1309
Number of pages9
JournalNuclear Fusion
Issue number10
StatePublished - Oct 1981

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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