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  • 11
    Digitale Medien
    Digitale Medien
    Atomic hydrogen density measurements in the Tara tandem mirror experiment (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 2168-2172 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Neutral and plasma density have been measured in the north well of the central cell of the Tara tandem mirror [Nucl. Fusion 22, 549 (1982)]. The electron plasma density and temperature on the magnetic axis were measured by Thomson scattering to be about 3×1012 cm−3 and 70 eV, respectively. The corresponding axial neutral hydrogen density was found to be 1 ×109 cm−3, while near the plasma edge at r=15 cm it reached 1×1010 cm−3. The fill gas density at r≥22.5 cm was ≈1011 cm−3. Additional information from secondary electron detectors was used to estimate the radial ion temperature distribution, which was found to have about the same width, 12 cm, as the plasma density. The resulting ion pressure profile is peaked compared to the electron pressure profile. Charge exchange losses in the well are found to have a maximum at a radius equal to half the e-folding distance of the plasma density and ion temperature distributions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.859438
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  • 12
    Digitale Medien
    Digitale Medien
    Radial ion transport measurements in a nonaxisymmetric magnetic mirror (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 2173-2184 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Experimental radial ion transport rates and diffusion coefficients are presented for the Constance-B magnetic mirror [Phys. Rev. Lett. 58, 1853 (1987)]. The transport experiments are performed by measuring steady state equilibrium radial profiles of plasma density, ionization source, end loss current, electric field, electron temperature, and ion temperature. A charge coupled device (CCD) camera system [Rev. Sci. Instrum. 60, 2835 (1989)] is used to measure the two-dimensional radial density, source, and electron temperature profiles. End loss diagnostics including movable Faraday cups, electrostatic end loss analyzers, and an ion time-of-flight analyzer [Rev. Sci. Instrum. 59, 601 (1988)] are used to measure radial profiles of potential and ion temperature. The ion confinement time perpendicular to the magnetic field is found to be an order of magnitude shorter than predicted by classical and neoclassical transport theories. The radial profiles of the perpendicular diffusion coefficient (D⊥) are presented for hydrogen, helium, and argon plasmas. The coefficients are a factor of 10 larger than the maximum classical and neoclassical coefficients in all three plasmas. Plasma fluctuations resulting from whistler mode microinstability [Phys. Rev. Lett. 59, 1821 (1987)] as well as nonaxisymmetric potentials are suggested as possible explanations for the experimentally measured radial transport rate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.859398
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  • 13
    Digitale Medien
    Digitale Medien
    Whistler instability in an electron-cyclotron-resonance-heated, mirror-confined plasma (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 242-252 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The warm-electron-driven (2 keV) whistler electron microinstability [Phys. Rev. Lett. 59, 1821 (1987)] of the Constance B electron-cyclotron-resonance-heated (ECRH), quadrupole mirror-confined plasma experiment has been studied. Experiments show (i) that the instability comes in fairly regular bursts on axis and continuously in time off axis due to the minimum-B geometry, (ii) a frequency spectrum that is insensitive to changes in the plasma parameters, and (iii) instability-induced power losses which are not greater than 10% of the ECRH power input for the regimes studied. A linear perturbation analysis of the relativistic Vlasov equation together with Maxwell's equations has been made. Using the ECRH distribution function, a new distribution function well suited for describing ECRH, mirror-confined plasmas, the analysis shows the instability frequency spectrum to be insensitive to changes in cyclotron frequency, temperature, and density, in agreement with experimental results, and only sensitive to changes in ECRH frequency.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.859234
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  • 14
    Digitale Medien
    Digitale Medien
    Observation of trapped particle modes in a tandem mirror (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 608-614 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An instability with azimuthal mode number m≥3 localized to an axisymmetric end cell of the Tara tandem mirror [Nucl. Fusion 22, 549 (1982)] has been observed, most prominently during strong ion cyclotron resonance heating in the end cell. The instability, which causes enhanced radial losses, becomes either more stable or flutelike when the connection (passing fraction) between the central cell and end cell is increased, depending on whether sufficient stabilization is provided in the central cell. The beta is sufficiently low to rule out the possibility of magnetohydrodynamic ballooning modes. Based on the plasma parameters, the instability appears to be a collisionless curvature-driven trapped particle mode that has been predicted to be unstable in linked minimum- and maximum-B mirror devices.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.859120
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  • 15
    Digitale Medien
    Digitale Medien
    Stability of plasmas sustained by ion cyclotron wave excitation in the central cell of the Tara tandem mirror (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 851-861 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The stability of plasmas produced by radio-frequency heating in the ion cyclotron frequency range (ICRF) has been studied in the central cell of the Tara tandem mirror [Nucl. Fusion 22, 549 (1982); Plasma Physics and Controlled Nuclear Fusion Research 1986, Proceedings of the 11th International Conference, Kyoto (IAEA, Vienna, 1987), Vol. II, p. 251]. Ion cyclotron wave excitation by a slot antenna provided stability against macroscopic plasma motions in an axisymmetric configuration. The maintenance of macroscopic stability depended on the ICRF power, gas fueling rate, ion cyclotron resonance location, and ω/ωci at the antenna location. The ICRF ponderomotive force model is consistent with many of the observed stability features and predicts that the E+ component of the ion cyclotron wave was responsible for the stabilization. The Alfvén ion cyclotron microinstability was observed when the plasma β⊥ and anisotropy were sufficiently high. Magnetic probe measurements of the unstable mode identified it as an ion cyclotron wave and the instability threshold was within a factor of 2 of the theoretical value.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.859010
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  • 16
    Digitale Medien
    Digitale Medien
    Plasma potential enhancement by rf heating near the ion-cyclotron frequency (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 902-904 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The observation of enhanced plasma potentials, i.e., potentials greater than the Boltzmann values, in a mirror device is reported. The potential structure is driven by strong radio frequency heating near the ion-cyclotron resonance and near the local electron bounce frequency. The potentials and their effect on losses from the central cell of a tandem mirror are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.865683
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  • 17
    Digitale Medien
    Digitale Medien
    The annual cycle of Simulium erythrocephalum (Diptera: Simuliidae) at a site in Norfolk (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 13 (1983), S. 0 
    Details
    ISSN: 1365-2427
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: SUMMARY. Size frequency distributions of larvae of Simulium erythrocephalum sampled regularly throughout 1978 from the River Tiffey at Carlton Forehoe, Norfolk, revealed five generations per year. The number of larval instars could be determined for the second and fifth generations, being six and seven respectively. Individuals of the overwintering generation were of larger ultimate size, had more ovarioles and apparently laid larger eggs than those of the summer generations. Females were larger than males throughout the year.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2427.1983.tb00687.x
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  • 18
    Digitale Medien
    Digitale Medien
    Central and Systemic Corticosterone Differentially Affect Dopamine and Norepinephrine in the Frontal Cortex of the Awake Freely Moving Rat (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 746 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb39287.x
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  • 19
    Digitale Medien
    Digitale Medien
    Seeds of Sodium, Potassium ATPase (1989)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physiology 51 (1989), S. 1-16 
    Details
    ISSN: 0066-4278
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Medizin , Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ph.51.030189.000245
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  • 20
    Digitale Medien
    Digitale Medien
    Nuclear Fusion (1976)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Environment and Resources 1 (1976), S. 213-255 
    Details
    ISSN: 0362-1626
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Energietechnik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.eg.01.110176.001241
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