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  • 1
    Electronic Resource
    Electronic Resource
    Neoclassical transport in an annular penning trap (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2760-2762 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A modified Penning trap is described with an annular confinement region and a toroidal magnetic field. A non-neutral electron plasma is confined axially by an electrostatic field and, in the radial direction, particles are constrained to lie within a small drift distance of a cylindrical flux surface. Drift orbits of all particles are banana-shaped and collisions cause neoclassical transport. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872145
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental studies of charged dust particles (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 2200-2206 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the charge on individual dust grains of glass and copper have been made in a double plasma device with monoenergetic primary electrons and a tenuous plasma. In conditions where the current collected by grains is dominated by the primary electrons, the grains charge to the potential which repels the primary electrons. The charging potential is reduced from this value when the fast electrons are sufficiently energetic to release a comparable current of secondary electrons. In addition, confinement of charged dust has been investigated in evacuated electrostatic traps consisting of a center electrode at high potential within a grounded enclosure. The confinement time of particles orbiting the center conductor may be an hour or ∼105 orbits. The orbits are visible and the effects of perturbations have been videotaped. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871242
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  • 3
    Electronic Resource
    Electronic Resource
    Electron diffusion in the annular Penning trap (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 3264-3271 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transport by cross-field diffusion has been studied in the annular Penning trap in which a nonneutral plasma of electrons is contained between concentric cylinders. At densities sufficiently low (〈105 cm−3) to suppress mobility transport arising from the space charge electric field, the dominant sources of transport are diffusion from collisions of electrons with added helium gas and asymmetry transport from stray fields. The collisional diffusivity is shown to scale linearly with collision frequency and inversely with the square of the axial magnetic field. The measured mean energy is initially 0.3 eV and the least energetic electrons are lost more slowly as a consequence of the energy dependence of the diffusivity. Decay constants are about a factor of four higher than calculated from the electron–helium momentum transfer collision frequency. Both the asymmetry transport and the collisional transport are shown to depend upon the cleanliness of the trap surfaces. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1495873
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  • 4
    Electronic Resource
    Electronic Resource
    Neoclassical effects in the annular Penning trap : The 42nd annual meeting of the division of plasma physics of the American Physical Society and the 10th international congress on plasma physics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 1863-1869 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neoclassical transport has been investigated with a modified Malmberg–Penning trap which has conductors along the axis to create an azimuthal magnetic field. The axial bounce motion of the electrons is accompanied by a radial drift which changes sign at the ends of the device causing drift orbits of finite radial extent. Analysis and numerical simulations show that the transport is neoclassical with mobility and diffusion coefficients depending upon the axial magnetic field alone rather than the absolute value of the magnetic field. Experiments with added helium gas to create electron-neutral collisions show that the electron mobility from an applied radial electric field and the Ware drift from an azimuthal electric field both have neoclassical values over a wide range of magnetic fields and collision frequencies. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1345885
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  • 5
    Electronic Resource
    Electronic Resource
    Collective behavior of non-neutral plasma in a Kingdon trap (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3-5 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pancake-like clouds of non-neutral plasma confined in near-circular orbits in a cylindrical electrostatic (Kingdon) trap will have similarities to planetary rings, galaxies, and accretion disks. For example, the rotation is sheared, interparticle collisions cause radial spreading, and there are spiral density waves and bending waves similar to those observed in the rings of Saturn. The dispersion relations have one term with a change of sign as a consequence of the difference in sign between the Coulomb force and the gravitational force. Disks may be subject to negative mass instabilities if there is insufficient spread in the particle velocities. Charged dust particles have a sufficiently long confinement time to allow experimental observations of these waves and instabilities. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871114
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  • 6
    Electronic Resource
    Electronic Resource
    Electron confinement in an annular Penning trap (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 2340-2347 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron confinement in an annular version of a Malmberg–Penning trap [S. Robertson and B. Walch, Rev. Sci. Instrum. 70, 2993 (1999)] has been investigated for conditions in which mobility is the dominant source of transport. A non-neutral plasma of electrons is contained in the annular region between coaxial cylinders. An axial magnetic field provides radial confinement and electric bias potentials provide axial confinement. The electric field that drives transport is determined primarily by the potential difference applied to the cylinders. The measured density decay rates have the expected dependence upon electric field, collision frequency and magnetic field and are within a factor of 2 of calculated values. Experiments are performed with an axial field of 5–18 mT, a radial electric field of 11–38 V/cm, a helium pressure of 0.01–0.13 mTorr, an initial electron density of ∼106 cm−3, and the density decay times are 1–10 ms. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874070
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  • 7
    Electronic Resource
    Electronic Resource
    Annular Malmberg–Penning trap for studies of plasma confinement (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2993-2996 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An annular Malmberg–Penning trap is described for studies of plasma confinement. A plasma of electrons is contained in the annular region between coaxial cylindrical conductors and is confined radially by an axial magnetic field and axially by an electrostatic field. An azimuthal magnetic field created by a current-carrying center conductor causes gradient, curvature, and additional electric drifts thus allowing new types of transport studies. An initial electron density of 106 cm−3 is obtained with axial and azimuthal fields of ∼10 mT and fill pressures of 10−5 to 10−4 Torr of helium or argon. The electric mobility drift arising from electron collisions with neutral gas determines the density decay time of ∼2 ms. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149860
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  • 8
    Electronic Resource
    Electronic Resource
    Collective focusing of a charge-neutral ion beam with warm electrons (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 1765-1767 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical model is presented for the collective magnetic focusing of an intense ion beam which has been neutralized by a gas of warm electrons. This extends earlier work in which it was assumed that the electrons were cold and comoving. The field necessary to guide the beam at constant radius is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336445
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  • 9
    Electronic Resource
    Electronic Resource
    Flux generation in ultra-low-q tokamak discharges (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1113-1115 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spontaneous generation of toroidal flux is observed in a reversed-field pinch device operated as an ultra-low-q tokamak with a safety factor on axis of 1/4. An initial toroidal bias field of 150 G is increased to 600 G on axis in 300 μsec while the field at the wall is held nearly constant. Sawteeth are observed, which indicate cyclic magnetic reconnection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859840
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  • 10
    Electronic Resource
    Electronic Resource
    Spectra and growth rates of resistive wall modes in a reversed-field pinch (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 556-563 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Reversatron II [IEEE Trans. Plasma Sci. PS-16, 667 (1988)] reversed-field pinch has been operated with shells having magnetic penetration time comparable to and shorter than the discharge duration. The spectra and growth rates of the resistive wall modes have been measured and compared for the two cases. The growth rates of modes are typically in the expected range γτs=0.5–2 where γ is the growth rate and τs is the magnetic penetration time of the shell. The spectra, however, are broader than expected from linear theory and there are indications that both the growth rates and the mode spectra are affected by nonlinearities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860541
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