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  • 1
    Electronic Resource
    Electronic Resource
    rf suppression of E×B drift driven ion-cyclotron modes in a plasma (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1097-1100 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ion-cyclotron instabilities driven unstable by E×B drift in a low-pressure beam produced plasma are shown to be stablilized by lower hybrid pump waves under certain parameter conditions. Suppression is due to a ponderomotive force which shifts the frequency towards the cyclotron harmonics, thus increasing ion-cyclotron damping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341868
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental observation of very low-frequency macroscopic modes in a dusty plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 1212-1219 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Images of a cloud of grains in a dusty plasma reveal a pair of very low-frequency modes, termed here the filamentary and great void modes. The plasma was a radio-frequency discharge formed between parallel-plate graphite electrodes. A cloud of 100 nm carbon particles was produced by accretion of carbon atoms produced by sputtering the graphite. The cloud was illuminated with a laser sheet and imaged with a video camera. The great void mode was a spoke-shaped region of the cloud that was free of dust and rotated azimuthally in the discharge. The filamentary mode had the appearance of turbulent striations, with a smaller amplitude than the great void. The filamentary mode sometimes appeared as a distinctive vortex, curling in the poloidal direction. Both modes had a very low frequency, on the order of 10 Hz. Two possible causes of the modes are discussed. The low phase velocity of the modes may be consistent with a dust-acoustic wave. Alternatively, the great void may be an ionization wave that moved the dust about, since a modulation in the glow was seen moving at the same speed as the void. It is argued that existing theories of waves in dusty plasmas assume weakly collisional plasmas, which may be unsuitable for explaining experimental results in laboratory dusty plasmas, since they are often strongly coupled. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871745
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  • 3
    Electronic Resource
    Electronic Resource
    Lower hybrid suppression of drift waves in a plasma cylinder (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3145-3147 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Drift waves in a cylindrical plasma column with an exponential density profile have a Bessel function mode structure and are linearly unstable because of finite Larmor radius effects. In the presence of a lower hybrid eigenmode pump, these modes suffer a nonlinear frequency upshift because of the ponderomotive force and tend to be stabilized when k0z〉kz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866972
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  • 4
    Electronic Resource
    Electronic Resource
    Lower-hybrid quasimode decay in a plasma cylinder (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1576-1578 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the presence of an azimuthally symmetric lower-hybrid pump wave, a low-frequency density perturbation of frequency ω≈ωci having finite azimuthal mode number, generates a nonlinear current driving a lower-hybrid sideband wave. The sideband couples with the pump to produce a parallel ponderomotive force driving the low-frequency perturbation. For strongly ion cyclotron damped perturbation, the mode structure equation for the sideband wave has been solved using perturbation technique. The growth rate is strongly sensitive to the density and temperature of the plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859676
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    Paper (German National Licenses)
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