Observation of Oscillatory Radial Electric Field Relaxation in a Helical Plasma

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doi:10.1103/PhysRevLett.118.185002

Observation of Oscillatory Radial Electric Field Relaxation in a Helical Plasma

0

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Abstract

Measurements of the relaxation of a zonal electrostatic potential perturbation in a nonaxisymmetric 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 nonaxisymmetric 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.

Original language	English (US)
Article number	185002
Journal	Physical review letters
Volume	118
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.118.185002
State	Published - May 5 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.118.185002

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@article{178cbc9d6c434dd18966150d7fece4ff,

title = "Observation of Oscillatory Radial Electric Field Relaxation in a Helical Plasma",

abstract = "Measurements of the relaxation of a zonal electrostatic potential perturbation in a nonaxisymmetric 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 nonaxisymmetric 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.",

author = "0 and Alonso, {J. A.} and E. S{\'a}nchez and I. Calvo and Velasco, {J. L.} and McCarthy, {K. J.} and A. Chmyga and Eliseev, {L. G.} and T. Estrada and R. Kleiber and Krupnik, {L. I.} and Melnikov, {A. V.} and P. Monreal and Parra, {F. I.} and S. Perfilov and Zhezhera, {A. I.}",

note = "Publisher Copyright: {\textcopyright} 2017 authors. Published by the American Physical Society.",

year = "2017",

month = may,

day = "5",

doi = "10.1103/PhysRevLett.118.185002",

language = "English (US)",

volume = "118",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

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T1 - Observation of Oscillatory Radial Electric Field Relaxation in a Helical Plasma

AU - 0

AU - Alonso, J. A.

AU - Sánchez, E.

AU - Calvo, I.

AU - Velasco, J. L.

AU - McCarthy, K. J.

AU - Chmyga, A.

AU - Eliseev, L. G.

AU - Estrada, T.

AU - Kleiber, R.

AU - Krupnik, L. I.

AU - Melnikov, A. V.

AU - Monreal, P.

AU - Parra, F. I.

AU - Perfilov, S.

AU - Zhezhera, A. I.

PY - 2017/5/5

Y1 - 2017/5/5

N2 - Measurements of the relaxation of a zonal electrostatic potential perturbation in a nonaxisymmetric 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 nonaxisymmetric 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.

AB - Measurements of the relaxation of a zonal electrostatic potential perturbation in a nonaxisymmetric 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 nonaxisymmetric 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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U2 - 10.1103/PhysRevLett.118.185002

DO - 10.1103/PhysRevLett.118.185002

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JO - Physical review letters

JF - Physical review letters

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M1 - 185002

ER -

Observation of Oscillatory Radial Electric Field Relaxation in a Helical Plasma

Abstract

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