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  • 1
    Electronic Resource
    Electronic Resource
    Argon ion laser-induced fluorescence with diode lasers (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 10-15 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Diode lasers have been used for ion temperature measurements in ArII plasmas by finding new laser-induced fluorescence (LIF) schemes suited to the present range of available wavelengths. The new LIF schemes require excitation at 664, 669, and 689 nm, all near industry-standard wavelengths. Conventional LIF measurements performed by dye lasers in ArII use 611.66 nm in vacuum, shorter than any commercially available red diode laser line, and depend on the population of the 3d′ 2G9/2 metastable state. The metastable state density of the conventional LIF scheme was found to be larger than the populations of the other metastable states by an order of magnitude or less. A master oscillator power amplifier diode laser was used both in a Littman–Metcalf cavity and as an optical amplifier for a low power diode laser which was in a Littman–Metcalf cavity. Both systems provided intensity of up to 500 mW, continuously tunable over 10 nm centered at 666 nm, and were used to obtain high resolution ion velocity distribution functions. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148472
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Secondary electron emission-capacitive probes for plasma potential measurements in plasmas with hot electrons (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4786-4790 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that a secondary electron emission-capacitive probe can determine the plasma potential when Te ≥50 eV. The probe is wideband (1 Hz to greater than 20 MHz) and relatively simple to operate. The Phaedrus-B tandem mirror plasma where Te ∼40–60 eV and n(approximately-equal-to)5×1012 cm−3 is used to verify this technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338338
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Radial control of the electrostatic potential in a tandem mirror with quadrupole end cells (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 3210-3215 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated that the radial electrostatic potential in the Phaedrus tandem mirror [Plasma Physics and Controlled Fusion Research, 1984 (International Atomic Energy Agency, Vienna, 1985), Vol. 2, p. 265] can be altered using plasma potential control rings (PPC rings) situated at each end of the device. With the PPC rings grounded, the radial electric field in the central cell was directed outward and peaked near the plasma edge. By externally controlling the potentials of the PPC rings, the peak value of the radial electric field was varied by over a factor of 2, obtaining plasmas with a maximum value of the radial electric field E(r)≤15 V/cm. A simple calculation to model the change in the central cell potential due to a bias voltage applied to the PPC rings is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860427
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental studies of the rotational stability of a tandem mirror with quadrupole end cells (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 114-125 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated that the radial electric field in the Phaedrus Tandem Mirror [Plasma Physics and Controlled Nuclear Fusion Research 1984 (IAEA, Vienna, 1985), Vol. 2, p. 265] can be altered using plasma potential control rings (PPC rings) situated at each end of the device, and the azimuthal plasma rotational velocity may thus be varied. Low-frequency (ω(very-much-less-than)ωci), low azimuthal mode number (m=−1 and m=−2) instabilities driven by E×B rotation are observed and shown to be in qualitative agreement with the theory of Freidberg and D'Ippolito [Phys. Fluids 26, 2657 (1983)], and Phillips [Phys. Fluids 27, 1783 (1984)] for the case when Phaedrus is operated as a conventional tandem mirror with minimum-||B|| end cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859948
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  • 5
    Electronic Resource
    Electronic Resource
    Electrostatic end plugging accompanied by a central-cell density increase in an axisymmetric tandem mirror (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 2855-2869 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrostatic end plugging is observed in a completely axisymmetric, three cell tandem mirror under conditions where the central-cell plasma density is always larger than the end-cell density. A factor of 4 increase in the central-cell density, to a maximum of 1.2×1013 cm−3 with simultaneous plasma beta of 13%, occurs upon application of the end plugging potential. Ion confining potentials of 25 V and 80 V at the two ends of the device, respectively, result in a factor of 2.5 increase in the axial confinement time for Tic =40 eV in agreement with the collisional flow model for ion confinement. The non-Boltzmann ion confining potential is caused by electron heating in the end cells by rf near the ion-cyclotron frequency. The initial central-cell density rise is caused by an increase in the ionization rate that occurs because of an increase in the electron temperature. The density remains high throughout the end-cell heating pulse as a result of increased particle confinement time. There is no nonambipolar radial ion loss in the core plasma (r≤16 cm) but inward radial transport of ions is observed at a rate consistent with ion–neutral collisions and a radial electric field in the negative radial direction. Steady-state thermal-barrier-like potential dips that are in agreement with the Boltzmann model for potentials are observed in the transitions between the central cell and the end cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866050
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    Paper (German National Licenses)
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