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07 February 2025
 
  » arxiv » 1609.0281

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Observation of oscillatory radial electric field relaxation in a helical plasma
J. A. Alonso ; E. Sanchez ; I. Calvo ; J. L. Velasco ; S. Perfilov ; A. Chmyga ; L. G. Eliseev ; L. I. Krupnik ; T. Estrada ; R. Kleiber ; K. J. McCarthy ; A. V. Melnikov ; P. Monreal ; F. I. Parra ; A. I. Zhezhera ; TJ-II Team ;
Date 1 Sep 2016
AbstractMeasurements of the relaxation of a zonal electrostatic potential perturbation in a non-axisymmetric magnetically confined plasma are presented. A sudden perturbation of the plasma equilibrium is induced by the injection of a cryogenic hydrogen pellet in the TJ-II stellarator, which is observed to be followed by a damped oscillation in the electrostatic potential. The waveform of the relaxation is consistent with theoretical calculations of zonal potential relaxation in a non-axisymmetric magnetic geometry. The turbulent transport properties of a magnetic confinement configuration are expected to depend on the features of the collisionless damping of zonal flows, of which the present letter is the first direct observation.
Source arXiv, 1609.0281
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