Publications by Felix Parra Diaz

Observation of oscillatory radial electric field relaxation in a helical plasma

Physical Review Letters American Physical Society 118 (2017) 185002

JA Alonso, E Sanchez, I Calvo, JL Velasco, S Perfilov, A Chmyga, LG Eliseev, LI Krupnik, T Estrada, R Kleiber, KJ McCarthy, AV Melnikov, P Monreal, FI Parra Diaz, AI Zhezhera

Measurements 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.

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