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  • 1
    Electronic Resource
    Electronic Resource
    New vaporizing assembly for Q-plasma sources (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1407-1409 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design and operation of a new vaporizing assembly used for Q-plasma sources are described in this article. The vaporizing system, consisting of two ovens and an effuser, is used to vaporize and direct atoms onto a hot ionizer plate. The hot plate, which may be of tantalum, tungsten, or rhenium, singly ionizes the atoms on contact. The main advantages of this new assembly, compared to previous designs, are the production of higher plasma densities and the control of the radial plasma profile. The heaters of the two atomic beam ovens are independently controlled and monitored so that the gradients of the radial plasma profile can be modified. Plasma production with two ion species can also be performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144052
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  • 2
    Electronic Resource
    Electronic Resource
    An extension to laser-induced fluorescence measures multiple velocity components simultaneously (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3117-3121 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An extension to laser-induced fluorescence is presented. The new technique, called intermodulated optical tagging, can be used to measure multidimensional velocity distribution functions directly as well as to tag ions in two velocity and three spatial coordinates. The first application makes the technique a possible replacement for tomography, the second makes it useful for heretofore difficult transport measurements. Application to velocity-space transport perpendicular to the magnetic field is discussed for a quiescent plasma. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147437
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  • 3
    Electronic Resource
    Electronic Resource
    Slowing down of an ion beam in a background plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2824-2826 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The slowing down of a barium ion beam into two different plasma backgrounds was measured using laser-induced fluorescence. The measurements were performed in a Q machine (Ti=Te=0.2 eV, 6×1010≤nback≤1.2×1010 cm−3), where a barium ion beam, with energy 0–40 eV, was injected, parallel to the confining magnetic field, into both a cesium and a lithium plasma. In order to treat the ion beam as a class of test particles, the ion beam density was maintained at approximately two orders of magnitude below the density of the background plasma. Measured changes in the velocity profile of the ion beam agrees well with the predictions of the Fokker–Planck for both nearly equal mass beam and background ions as well as for a background ion with approximately 1/20th the mass of the beam ion. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871718
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  • 4
    Electronic Resource
    Electronic Resource
    Positron trapping in a magnetic mirror configuration (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 4369-4371 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In a first step toward generating an electron–positron plasma, a proof-of-principle experiment is reported in which externally injected slow positrons are trapped in a magnetic mirror configuration by electron cyclotron resonance heating. With a primary flux of only 530 slow positrons/s from a 600 μCi Na-22 positron source/moderator system, an estimated equilibrium density of 5×102 cm−3 is obtained in a 20 cm3 volume. With an appropriate increase of the injected positron flux, densities in the 107 cm−3 range can be expected. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871466
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  • 5
    Electronic Resource
    Electronic Resource
    A new plasma source based on contact ionization (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 598-600 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new type of plasma source is presented: A collisionless plasma is formed by producing ions on one end and electrons on the other of a cylindrical vacuum chamber in a solenoidal magnetic field. The ions are produced by contact ionization of potassium on tungsten. The source of electrons is a LaB6 plate. In the usual single-ended Q machine the elements rhenium, iridium, and platinum are tested as ionizing metals for potassium and barium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335669
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  • 6
    Electronic Resource
    Electronic Resource
    Adjustable levels of strong turbulence in a positive/negative ion plasma (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1523-1528 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Positive/negative ion plasmas, composed of Ba+, SF6−, and residual electrons, were observed to display characteristics of strong turbulence. Experiments on the UCI Q machine linked the presence of negative ions (and the depletion of electrons) with large density fluctuations (δn/n(approximately-equal-to)1), large-amplitude, low-frequency electrostatic noise (f≤20 kHz), and rapid transport of ions across magnetic field lines (D⊥(approximately-equal-to)104 cm2/sec). Ion velocity distributions were heated parallel to and cooled perpendicular to the confining magnetic field. The partial pressure of gaseous SF6 was shown to serve as a regulator of plasma turbulence. Turbulence levels could be smoothly varied from quiescent states (δn/n(approximately-equal-to)0.01) to strongly turbulent states (δn/n(approximately-equal-to)1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860892
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  • 7
    Electronic Resource
    Electronic Resource
    Negative-ion plasma sources (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1369-1375 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Three designs for negative-ion plasma sources are described. Two sources utilize metal hexafluorides such as SF6 and WF6 to scavenge electrons from electron-ion plasmas and the third relies upon surface ionization of alkali halide salts on heated alumina and zirconia. SF6 introduced into electron-ion plasmas yielded negative-ion plasma densities of 1010 cm−3 with low residual electron densities, (ne/ni∼0.01–0.05). On alumina, plasma densities of 5×109 cm−3 were obtained for CsCl, CsI, and KI and 109 cm−3 for KCl. On zirconia 1010 cm−3 densities were obtained for CsCl. For alkali halide sources, electron densities of ne/ni(approximately-less-than)10−4 have been achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139671
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  • 8
    Electronic Resource
    Electronic Resource
    An improved Q-Machine source (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1095-1100 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The development of a new Q-plasma source is described. Emphasis is given to the novel parts of the system which have been designed to produce long term, constant density plasmas with low fluctuation levels, as well as long machine operation time. Relevant plasma parameters are obtained by laser induced fluorescence which is used as a diagnostic on the barium plasma. Plasma densities are in the range of 108 cm−3 to 1011 cm−3, with an electron temperature of about 0.2 eV, and a perpendicular ion temperature of the same magnitude. The parallel ion temperature is one half the perpendicular value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141429
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  • 9
    Electronic Resource
    Electronic Resource
    Barium ion Zeeman and space potential diagnostic (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1033-1035 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A diagnostic has been developed to simultaneously determine the magnetic field and space potential in fusion-like plasmas.1 In Fig. 1, we show schematically the diagnostic concept. The magnetic field is determined by a measurement of the Zeeman resonance absorption pattern of an energetic (〈30 keV) barium ion beam (10 μA). The spectrum is obtained by laser-induced fluorescence. In our approach, similar to a technique developed at UC Irvine,2 the absorption spectrum of the barium ion beam is measured as the frequency of a narrow-linewidth dye laser is scanned over the Doppler-shifted Zeeman-split resonance transition. The resonantly scattered light at 4934.1 A(ring) is collected without frequency processing other than a narrow-band filter to reduce background plasma light. Space potentials are determined by a measurement of the Doppler shift due to a change in beam energy, E=E0−eφp(E0 is the beam energy, φp is the plasma potential). The laser is injected tangentially to the ion beam to take advantage of the narrow Doppler spread in the direction of the beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138259
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  • 10
    Electronic Resource
    Electronic Resource
    Direct ion-transport measurement by optical tagging
    Amsterdam : Elsevier
    Physics Letters A 93 (1983), S. 127-130 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(83)90073-7
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