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  • 1
    Electronic Resource
    Electronic Resource
    Experimental study of growth rate scaling and quasicoherent states in plasma turbulence (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 3577-3586 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental results of the scaling of linear growth rate with the electrostatic fluctuation levels are presented. A quadratic scaling was obtained for the ion temperature gradient-driven instability (ITG), characteristic of weak turbulence. For the rotationally driven E×B mode, a linear scaling was obtained, characteristic of strong turbulence. Moreover, the linear growth rate scaling for the E×B mode exhibited two distinct behaviors, corresponding to a broadening and a narrowing of the spectral width as a function of increasing fluctuation level. The spectral broadening is associated with the usual turbulent broadening, while the spectral narrowing is attributed to the presence of coherent structures via self-organization. Radial harmonics were detected and shown to contribute to the spread in the spectral width. These structures were also studied via a bispectral analysis. The evolution to the quasicoherent state was also found to result in the presence of a fewer number of radial harmonics in the saturated state. It revealed the presence of three-wave coupling involving the radial and azimuthal harmonics, suggesting a possible mechanism for the nonlinear saturation of the mode and anomalous transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870893
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Compact ion beam source for feedback control of plasma instabilities (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4427-4431 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact ion beam source has been constructed for use in the Columbia Linear Machine for feedback control of plasma instabilities. This source has been used in a feedback configuration to stabilize the collisionless trapped particle instability [Phys. Rev. Lett. 67, 204 (1991)]. The source was based on an E×B hot cathode, magnetron-type design. It utilized the background magnetic field and a radial discharge voltage to obtain the azimuthal E×B drifts. The pressure inside the discharge chamber was maintained in the mTorr range via differential pumping. The source had a stable operating window in gas pressure of over 50% about the chosen operating parameters. Typical source plasma parameters were a plasma potential of 100 V, an electron temperature of 10 eV, and a plasma density of 109–1010 cm−3. The power dissipated was around 30 W. The ion beam energy was typically 100 eV with an energy spread of 20 eV and it could be modulated 100%. In addition, external control of the ion beam energy was provided via the anode bias.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143691
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optically induced electromagnetic radiation from semiconductor surfaces (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2228-2230 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrafast electromagnetic radiation induced by a femtosecond laser beam from a semiconductor provides determination of the impurity doping concentration, carrier mobility, sign, and strength of the depletion field near the semiconductor surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102952
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Feedback stabilization of plasma instabilities using a modulated ion beam (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 3058-3065 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new technique for feedback suppression using a modulated ion beam as a remote suppressor has been developed for the first time. A Langmuir probe was used as the sensor. The feedback loop was completed with a phase shifter and amplifiers. This technique was demonstrated by stabilizing the collisionless, curvature-driven trapped particle instability down to a baseline noise level with an appropriate feedback gain and phase. An important feature is that the injected ion beam is nonperturbing to the plasma, constituting only 1% of the plasma density. A simple theory to describe the experimental results is presented and its predictions show generally good agreement with the experiment. To indicate that this concept could also be extended to other plasma instabilities, the rotationally driven E×B mode was also stabilized. Since the basic mechanism of suppression is the cancellation of charge separation inherent in an instability, a modulated electron beam performed equally well. Such remote, nonperturbing particle beam suppressors have great potential for remote suppression of plasma instabilities in a variety of plasma devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860416
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Ion-temperature-gradient instability driven transport and its parametric scaling (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 4341-4346 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experiments are reported on the ion thermal transport due to the ion-temperature- gradient-driven instability (ITG mode) and its transport scaling properties with respect to instability parameters like fluctuation level ñ/ni and linear growth rate as well as the drive parameter ηi(=∂ ln[Ti]/∂ ln[ni]) in the Columbia Linear Machine [Phys. Fluids 26, 1044 (1983)]. The measured local ion thermal conductivity χ⊥(r) is highly anomalous and strongly correlated with the radial profile of the ITG mode. The linear scaling of the averaged thermal conductivity 〈χ⊥(r)〉 with the averaged mode fluctuation level 〈ñ/ni〉 and linear growth rate indicates strong turbulence-type scaling. The scaling of χ⊥ with the drive parameter ηi is offset linear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860551
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Roxithromycin induced acute urticaria (2002)
    Oxford, UK : Blackwell Science, Ltd
    Allergy 57 (2002), S. 0 
    Details
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1398-9995.2002.1n3598.x
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