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  • 1995-1999  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Direct determination of ion wave fields in a hot magnetized and weakly collisional plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 4316-4324 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrostatic ion cyclotron wave fields are determined in a magnetized and weakly collisional plasma. A phased-locked Laser Induced Fluorescence (LIF) diagnostic is used to directly measure the wave perturbed ion velocity distribution. Comparing these local LIF measurements with a theoretical model uniquely determines the wave parameters, such as the wave potential, the three-dimensional wave vector, and the effective wave damping. The self-consistent wave–particle interaction is modeled by Boltzmann–Poisson equations in the limit of weak collisions. The wave parameters determined from local measurements agree with those determined from spatial scans. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871581
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A system to measure suprathermal electron distribution functions in toroidal plasmas by electron cyclotron wave absorption : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 496-499 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A two-chord, four-beam suprathermal electron diagnostic has been installed on TdeV (B〉1.5 T, R=0.86 m, a=0.25 m). Resonant absorption of extraordinary mode electron cyclotron waves is measured to deduce the chordal averaged suprathermal electron distribution function amplitude at the resonant momentum. Simultaneously counterpropagating beams permit good refractive loss cancellation. A nonlinear frequency sweep leads to a concentration of appropriately propagating power in a narrow range of time of flight, thus increasing the signal-to-noise ratio and facilitating the rejection of spurious reflections. Numerous measurements of electron distribution functions have been obtained during lower-hybrid current-drive experiments. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147615
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nonlinear optical tagging and laser induced fluorescence : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 629-631 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Optical test-particle diagnostics based on laser induced fluorescence are typically performed in the regime of weak optical pumping or in the regime of a short tagging pulse. In such cases, it is usually possible to construct a linear transfer function to describe the effect of tag-beam optical pumping on search beam fluorescence. The regime where particle dynamics plays a role in the optical pumping and laser induced fluorescence processes is explored. In this new regime, the diagnostic signal is nonlinearly related to the pump beam amplitude, and it becomes necessary to consider the time-dependent process of optical pumping on each particle orbit. The possibilities of techniques based on this extension are illustrated by a simple example which shows how ion Fokker–Planck diffusion can be measured with a single laser beam. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146308
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    Paper (German National Licenses)
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