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  • 11
    Electronic Resource
    Electronic Resource
    A nonlocal analysis of electrostatic waves in hot inhomogeneous bounded plasmas (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 475-487 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A numerical code, seal, solving the full form of a second-order integrodifferential equation that describes electrostatic waves in a slab plasma is presented. No expansion in the smallness of the ion Larmor radius is made. The plasma may have arbitrary density and temperature profiles and is immersed in a nonuniform magnetic field. Only small magnetic field gradients, Maxwellian equilibrium distribution functions, and ky =0 are assumed. First the integral equation is derived in Fourier space using the linearized Vlasov and Poisson equations, and then it is transformed back into real space, which enables us to treat the case of bounded plasmas. The two boundary conditions specified simulate an antenna at one end of the plasma and wave-reflecting walls. Solutions having wavelengths smaller than the ion Larmor radius have been found. Comparison with experiments where ion Bernstein waves are launched in argon and barium plasmas shows very good agreement with the solution of the code seal. A positive-definite formula for the local power absorption is also derived and computed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859337
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  • 12
    Electronic Resource
    Electronic Resource
    Electrostatic degrees of freedom in non-Maxwellian plasma : Review,Tutorial and Invited Papers from the 43rd Annual Meeting of the APS Division of Plasma Physics (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1931-1937 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Detailed measurements of the ion velocity distribution function are used to test representations of the electrostatic degrees of freedom of slightly non-Maxwellian plasmas. It is found that fluid theory does not describe the data very well because there exist multiple closely spaced kinetic electrostatic modes. New wave branches appear that theoretically should persist as weakly damped modes even with Te∼Ti. Both a sum over discrete dispersion relations and the Case–Van Kampen spectral representation can be used to provide working descriptions of the data, but the latter has certain advantages. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1462031
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  • 13
    Electronic Resource
    Electronic Resource
    Weakly damped acoustic-like ion waves in plasmas with non-Maxwellian ion distributions (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3550-3557 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dispersion relations for ion-acoustic-like waves in plasmas with and without superthermal particles are calculated using a simple pole expansion of the distribution function for the ions. It is found that slow weakly damped modes exist in two-temperature plasmas, and the conditions when these modes appear are investigated. For plasmas with equal ion and electron temperatures weakly damped modes are found when there is a depletion of the high-energy tails. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1386428
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  • 14
    Electronic Resource
    Electronic Resource
    Excitation of ion Bernstein waves from loop antennas (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2030-2036 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct excitation and propagation of ion Bernstein waves from low-impedance current-carrying loop antennas in the ion cyclotron frequency range are studied over a range of plasma and antenna parameters. The dependence of wave coupling efficiency on plasma density and on wave frequency and parallel wavelength is obtained from measurements of wave amplitude and variations in antenna impedance. Comparisons are made to a simple nonuniform warm-plasma model of the coupling problem. Generally good agreement is found between theory and experiment. As a result, some guidelines are proposed concerning antenna design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866652
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  • 15
    Electronic Resource
    Electronic Resource
    Parasitic excitation of ion Bernstein waves from a Faraday-shielded fast wave loop antenna (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 2453-2457 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Parasitic excitation of ion Bernstein waves is observed from a Faraday-shielded fast wave loop antenna in the ion-cyclotron frequency range. Local analysis of the Vlasov–Maxwell equations demonstrates the role of the plasma density gradient in the coupling process. The effects of plasma density and of parallel wavenumber on the excitation process are investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865253
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  • 16
    Electronic Resource
    Electronic Resource
    Ion dynamics in nonlinear electrostatic structures (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3139-3142 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct experimental determination of terms in the ion kinetic equation is used to address the question of ion dynamics in low-frequency electrostatic structures. Problems in quantitative laser-induced florescence in plasmas are addressed, especially the problem of the relative metastable fraction. In addition to determining terms in the ion kinetic equation and the plasma electric field, the measurements determine the energy-dependent cross section for metastable quenching. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1379044
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  • 17
    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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  • 18
    Electronic Resource
    Electronic Resource
    Measurements of electron parallel momentum distributions using cyclotron wave transmission (abstract) : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4618-4618 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The method of cyclotron wave transmission for measuring the electron parallel momentum distribution is studied in a lower-hybrid driven tokamak plasma. Questions of resolution, sensitivity, and technique are addressed. Measurements are made of the suprathermal distribution produced by current drive as well as the incremental changes in the distribution function produced by short pulses of lower-hybrid waves. The results indicate that cyclotron wave transmission is well suited for studies of electron velocity space phenomena and may be used to detect the effect of diagnostic perturbations. This research was supported by the U. S. Department of Energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143688
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  • 19
    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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  • 20
    Electronic Resource
    Electronic Resource
    Test particle diagnostics for high-temperature plasmas (abstract) : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3146-3146 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new type of tagging diagnostic which employs ballistic modes to follow particle orbits is introduced. "Vlasov tagging'' is accomplished by the selective excitation of small amplitude ballistic modes either by the resonant Landau or cyclotron resonant absorption of incident waves or by spatially localized nonresonant nonlinear interactions. Subsequent detection of ballistic modes may be accomplished by laser fluorescence (for ions) or by changes in the transmission of a probe beam. Results demonstrating ion Vlasov tagging will be presented. Electron Vlasov tagging appears most attractive by means of the cyclotron resonance. Transmission measurements with a search beam may be made at the harmonics. Vlasov tagging may be used to directly measure transport in both velocity and coordinate space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141661
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