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  • 1
    Electronic Resource
    Electronic Resource
    Upper bound for the space-charge limited current of relativistic electron beams in finite-length coaxial drift tubes (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3108-3111 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A two-dimensional theory for calculating an upper bound for the space-charge limited current of relativistic electron beams is extended to coaxial drift tubes. The theory applies to annular beams of arbitrary radius, thickness and length travelling in a grounded coaxial drift tube of circular cross section. Poisson's equation for space-charge limited flow is replaced with a Sturm–Liouville-type eigenvalue problem. The problem reduces to numerically solving a determinantal equation rather than a partial differential equation. Under limiting cases, closed-form analytical expressions are derived. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874175
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  • 2
    Electronic Resource
    Electronic Resource
    A double hot cathode lateral extraction Penning ion source : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2475-2477 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An improved Penning ion source has been developed. This ion source has two helical filaments at the two ends of the discharge chamber. The design of the filaments is such that the resultant magnetic field distribution, which is a combination of the external field and those due to the two filaments, focuses the electrons from the filaments to the plasma region near to the lateral extraction slit, thus creating a hollow cathode effect. This produces an efficient discharge and a good positive ion output. This ion source can produce various species of ions including the ions of reactive gases with a longer lifetime of filaments than for comparable sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142916
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  • 3
    Electronic Resource
    Electronic Resource
    Sheath and presheath potentials for anode, cathode and floating plasma-facing surfaces (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 2522-2527 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Simple expressions for sheath and presheath potentials are provided for anode, cathode and electrically floating plasma-facing surfaces. The expressions are developed using a fully kinetic theory that includes the effects of secondary or thermionic electron emission from the plasma-facing surface. The emission can be space-charge limited and a criterion is provided for the onset of space-charge saturation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369845
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  • 4
    Electronic Resource
    Electronic Resource
    Annealing of zinc-implanted GaAs (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 5470-5476 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of ion-implanted zinc in GaAs has been made using three annealing techniques: e-beam, graphite strip heating, and furnace annealing in an arsine ambient. The highest hole concentrations, 7–8×1019 cm−3, were obtained using electron-beam annealing. Graphite strip heating and electron-beam annealing were able to electrically activate 100% of the implanted dose. The effect of strain on the activation of the zinc has been demonstrated by comparing chemical-vapor-deposited Si3N4 with reactively evaporated AlN encapsulants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334823
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of O2, Ar, and H2 gases on the field-emission properties of single-walled and multiwalled carbon nanotubes (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1867-1869 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We compare the effects of O2, Ar, and H2 gases on the field-emission (FE) properties of single-walled carbon nanotubes (SWNTs) and multiwalled carbon nanotubes (MWNTs). We find that H2 and Ar gases do not significantly affect the FE properties of SWNTs or MWNTs. O2 temporarily reduces the FE current and increases the turn-on voltage of SWNTs. Full recovery of these properties occurs after operation in UHV. The higher operating voltages in an O2 environment cause a permanent decrease of the FE current and an increase in the turn-on field of MWNTs. The ratios of the slopes before and after O2 exposure are approximately 1.04 and 0.82 for SWNTs and MWNTs, respectively. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1401785
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