The m=1 diocotron mode of a nonneutral plasma column confined in a Malmberg-Penning trap, i.e. the rotation of the plasma center-of-charge around the longitudinal symmetry axis, is experimentally found to be unstable. We have investigated in the ELTRAP device a control mechanism of the radial drift of the column based on a Radio Frequency drive applied on an azimuthally sectored electrode of the trap. Systematic experiments show the characteristic features of the mechanism, namely the presence of amplitude and frequency thresholds as well as the non-resonant behavior, whose interpretation invokes the concept of dynamic stabilization.
Non-resonant dynamic stabilization of the m=1 diocotron mode / G. Maero, B. Paroli, R. Pozzoli, M. Romé - In: Plasmas in the laboratory and the universe : interactions, patterns, and turbulence / [a cura di] G. Bertin, F. De Luca, G. Lodato, R. Pozzoli, M. Romé. - [s.l] : American Institute of Physics, 2010. - ISBN 978-0-7354-0787-9. - pp. 183-190 (( convegno International symposium Plasmas in the laboratory and the universe : interactions, patterns, and turbulence tenutosi a Como, Italy nel 2009 [10.1063/1.3460122].
Non-resonant dynamic stabilization of the m=1 diocotron mode
G. MaeroPrimo
;B. ParoliSecondo
;R. PozzoliPenultimo
;M. RoméUltimo
2010
Abstract
The m=1 diocotron mode of a nonneutral plasma column confined in a Malmberg-Penning trap, i.e. the rotation of the plasma center-of-charge around the longitudinal symmetry axis, is experimentally found to be unstable. We have investigated in the ELTRAP device a control mechanism of the radial drift of the column based on a Radio Frequency drive applied on an azimuthally sectored electrode of the trap. Systematic experiments show the characteristic features of the mechanism, namely the presence of amplitude and frequency thresholds as well as the non-resonant behavior, whose interpretation invokes the concept of dynamic stabilization.Pubblicazioni consigliate
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