TG wave autoresonant control of plasma temperature

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Experiments and theory characterize the novel chaotic neoclassical transport scaling as ν 0 c B −1 in contrast to traditional collisional neoclassical transport scaling as ν 1/2 c B −1/2 . This chaotic transport occurs when local trapping separatrices have θ-variations or temporal fluctuations. Experiments observe bulk particle transport, damping of Langmuir waves and diocotron waves, and nonlinear wave-wave couplings. These effects may be important in low-collisionality fusion plasmas.

Section: Introductionmentioning

confidence: 98%

Transport, damping, and wave-couplings from chaotic and collisional neoclassical transport

Driscoll

Kabant︠s︡ev

Dubin

et al. 2013

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“…In our experiment negative hydrogen ions are produced and confined in a room-temperature electron plasma [9]. The ‫ܪ‬ ି ions are formed in the plasma volume by dissociative electron attachment (DEA)…”

Section: ି ି ⁄ Plasma Productionmentioning

confidence: 99%

First experiments with e−/H− plasmas: Enhanced centrifugal separation from diocotron mode damping

Kabant︠s︡ev

Thompson

Driscoll

2018

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Negative hydrogen ions are produced and contained within a room-temperature electron plasma, by dissociative electron attachment onto exited ‫ܪ‬ ଶ neutrals. We observe a strongly enhanced centrifugal separation of electrons and ions when a diocotron mode is present. The outward ion transport rate is proportional to the diocotron mode amplitude, with concurrent diocotron mode damping. This is not yet understood theoretically.

“…These studies also present an experimental interest. Namely, radio-frequency (RF) drives are routinely used for the manipulation of non-neutral plasmas and the study of related particle transport phenomena [4,55,56,57,58,59,60,61,62].…”

Section: Introductionmentioning

confidence: 99%

Coherent structures and turbulence evolution in magnetized non-neutral plasmas

Romé

Chen²,

Maero

2018

The evolution of turbulence of a magnetized pure electron plasma confined in a Penning-Malmberg trap is investigated by means of a two-dimensional particle-in-cell numerical code. The transverse plasma dynamics is studied both in the case of free evolution and under the influence of non-axisymmetric, multipolar radio-frequency drives applied on the circular conducting boundary. In the latter case the radio-frequency fields are chosen in the frequency range of the low-order azimuthal (diocotron) modes of the plasma in order to investigate their effect on the insurgence of azimuthal instabilities and the formation and evolution of coherent structures, possibly preventing the relaxation to a fully-developed turbulent state. Different initial density distributions (rings and spirals) are considered, so that evolutions characterized by different levels of turbulence and intermittency are obtained. The time evolution of integral and spectral quantities of interest are computed using a multiresolution analysis based on a wavelet decomposition of density maps. Qualitative features of turbulent relaxation are found to be similar in conditions of both free and forced evolution, but the analysis allows one to highlight fine details of the flow beyond the self-similarity turbulence properties, so that the influence of the initial conditions and the effect of the external forcing can be distinguished. In particular, the presence of small inhomogeneities in the initial density configuration turns out to lead to quite different final states, especially in the presence of competing unstable diocotron modes characterized by similar growth rates.