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Observation of oscillatory radial electric field relaxation in a helical plasma
- Source :
- Phys. Rev. Lett. 118, 185002 (2017)
- Publication Year :
- 2016
-
Abstract
- 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.
- Subjects :
- Physics - Plasma Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 118, 185002 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1609.00281
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.118.185002