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Your search keyword '"Guzdar, P."' showing total 21 results
Start Over Author "Guzdar, P." Journal aip conference proceedings
21 results on '"Guzdar, P."'

2. Dynamo Transition

Author

Verma, M. K., primary, Yadav, R., additional, Chandra, M., additional, Paul, S., additional, Wahi, P., additional, Sen, A., additional, Sharma, S., additional, and Guzdar, P. N., additional

Published
2010
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20. Low Dimensional Model for the Fluctuations observed in the Maryland Centrifugal Experiment.

Author

Guzdar, P. N., Uzun-Kaymak, I., Hassam, A. B., Teodorescu, C., Ellis, R. F., Clary, R., Romero-Talamas, C., and Young, W.

Subjects
*DIMENSIONAL analysis, *MATHEMATICAL models, *FLUCTUATIONS (Physics), *PLASMA gases, *AXIAL loads, *MACH number
Abstract

The Maryland Centrifugal eXperiment (MCX) is a novel rotating mirror plasma, which is axially confined by the centrifugal force. The interchange modes can be stabilized by the shear in the azimuthal rotation velocity. Both these goals can be accomplished if the rotation speeds are supersonic with a Mach number∼5. So far Mach numbers∼2 have been accomplished. Thus residual interchange fluctuations are observed on sixteen magnetic pick-up coils placed azimuthally at an axial location mid-way between the central section and the mirror throat. The fluctuations are analyzed and modeled using a low-dimensional system of equations for the interchange mode coupled to zonal flows. [ABSTRACT FROM AUTHOR]

Published
2010
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21. Geodesic Acoustic Mode in Toroidal Plasma.

Author

Chakrabarti, N., Guzdar, P. N., Kleva, R. G., Singh, R., Kaw, P. K., Naulin, V., and Rasmussen, J. J.

Subjects
*GEODESIC flows, *PLASMA gases, *MATHEMATICAL models, *NUCLEAR excitation, *NONLINEAR theories, *EIGENVALUES, *PARAMETER estimation
Abstract

Geodesic acoustic modes (GAMs) are low frequency modes that were first predicted theoretically to occur in magnetically confined toroidal plasmas and found later in simulations of tokamak edge plasmas. They have been observed in various toroidal devices. Thus, investigating the source of excitation of these modes has been a very active area of research. Recently, we have addressed the issue of nonlinear excitation of these modes by three-wave resonant mode coupling to electron drift waves. We have extended this work to include finite beta effects. The finite beta effects have a strong stabilizing influence on the parametric excitation process. We have also investigated the role of plasma inhomogeneity in the edge plasma on the excitation of these modes. The two space scale analysis and eigenvalue studies shows that there is a short scale structure of the GAMs determined by the resonance condition and an envelope determined predominantly by the drift-wave and ambient inhomogeneity of the edge plasmas. The continuum GAM modes with coupling to the drift waves can create discrete 'global' unstable eigenmodes localized in the edge'pedestal' region of the plasma. Multiple resonantly driven unstable radial eigenmodes can coexist on the edge pedestal. [ABSTRACT FROM AUTHOR]

Published
2010
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