DMCA
Gontrol of Radial Electric Field and Low-Frequency Fluctuations in Open-Ended Systems INUTAKE Masaaki* (2000)
BibTeX
@MISC{00gontrolof,
author = {},
title = {Gontrol of Radial Electric Field and Low-Frequency Fluctuations in Open-Ended Systems INUTAKE Masaaki*},
year = {2000}
}
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Abstract
Both drift mode and flute mode instabilities are found to depend sensitively on radial electric field strength in the GAMMAl0 tandem mirror, when the electric field is controlled by use of end-plate biasing. In order to clarify effects ofboth radial electric field and its shear on low-frequency fluctuations, systematic experiments and precise measurements have been done in a small linear device, Qr-U of Tohoku University. Drift-mode fluctuations depend on both radial electric field and its shear. The driftmode is destabilized in the region of weakly negative electric field. In the strong E. region, the mode is suppressed, irrespective of its sign. This behavior agrees qualitatively with that observed in the ECH mode of GAMMAI0. The drift-mode in the Q7-U is clearly stabilized by the increase in the net ion drift shear which is defined as the sum of.E x I drift shear and ion diamagnetic drift shear. Flute-mode observed in the Q7-U is identified as Kelvin-Helmholtz instability driven by strong E x B drift shear. Keywords: open system, tandem mirror, end plate biasing, electric field shear, flow shear stabilization, drift wave, Kelvin-Helmholtz instabilitv 1.
Keyphrases
radial electric field low-frequency fluctuation open-ended system inutake masaaki net ion drift shear tohoku university radial electric field strength ech mode drift mode electric field shear weakly negative electric field small linear device tandem mirror flow shear stabilization kelvin-helmholtz instabilitv electric field gammal0 tandem mirror strong drift shear flute mode instability precise measurement open system plate biasing drift wave end-plate biasing kelvin-helmholtz instability drift-mode fluctuation ion diamagnetic drift shear systematic experiment
