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  • 1
    Electronic Resource
    Electronic Resource
    Scaling of voltage with cathode radius of a plasma opening switch (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2309-2313 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experiments have been performed to investigate voltage scaling in a plasma opening switch (POS) as the radius of the cathode is varied. Two different opening switch configurations have been used. In one of these the anode and cathode are simple coaxes with constant radii. In the other, there is an increase in anode radius immediately downstream of the switch. It is found that for all the data the peak voltage of the POS follows a simple scaling law with cathode radius for short conduction times, but that as conduction time is increased the two sets of data diverge. The configuration with the increased anode radius shows a marked improvement in operating voltage at long conduction times as compared to the simple hardware, however, the data from each set of hardware continue to follow the derived scaling law for all conduction times observed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358752
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  • 2
    Electronic Resource
    Electronic Resource
    Continuous highly charged ion beams from the National Institute of Standards and Technology electron-beam ion trap (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 1998-2002 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe our newly modified beam line and present its performance in conjunction with the National Institute of Standards and Technology electron-beam ion trap. We find that, contrary to previously reported results from similar ion sources, the highest intensity time-averaged ion fluxes are achieved by letting the ions boil out of the trap in a continuous stream rather than periodically dumping the trap to produce a pulsed beam. We produced continuous beams of 3.0(6)×106 Xe44+ ions per second and lower flux beams of charge states up to Xe49+. Also, in pulsed mode, we created beams with very high peak flux, over 1010 Xe44+ ions per second.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148087
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  • 3
    Electronic Resource
    Electronic Resource
    Improvements on the KSU-CRYEBIS: A facility for low-energy, highly charged ions : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1162-1164 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The KSU-CRYEBIS, a cryogenic electron beam ion source, delivers ions over a wide range of ion energy per charge, ion mass, and charge state for atomic physics experiments. Lower charge states yield time-averaged currents in the nA range, whereas the highest charge states, such as Ar18+, Fe24+, Kr34+, and Xe47+, yield time-averaged currents in the pA range. The number of available species and isotopes has been substantially increased, and include metalorganics to produce stable, high-yield beams of metal ions. The high-voltage platform control system and the ion optics have been improved and allow for acceleration of the ions to 160 kV/q as well as for deceleration to a fraction of 1 kV/q. The diagnostics of the facility are continuously being upgraded. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146719
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of object potentials on the wake of a flowing plasma (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 2675-2679 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements and calculations have been carried out to determine the structure of electric potential and ion density in the near wake created by the flow of a high-Mach-number plasma past a conducting plate biased with respect to the undisturbed plasma. Results are obtained for a molecular nitrogen plasma with ambient electron densities N of the order of 105 cm−3, ion temperatures of θi(approximately-equal-to)0.025 eV, electron temperatures of θ∼0.3 eV, and plasma flow velocities of V0(approximately-equal-to)106 cm/s, corresponding to V0/(θ/M)1/2(approximately-equal-to)11. For high-Mach-number flow past an unbiased object, the wake structure is very nearly that predicted for the expansion of an initially uniform plasma half-space into vacuum; in this case there is a sharply defined ion front moving under the influence of an electric field produced by charge separation between ions and electrons near the front. With bias potential φp such that qφp/θ is in the range −1 to −10, a well-defined ion front still exists, but its motion is strongly affected by the imposed potential. This effect can be explained in terms of the impulse received by those ions passing through the sheath region near the plate edge. Two-dimensional simulations of the laboratory experiments were performed by using a multiple waterbag technique. The results for both zero and finite ion temperatures are almost noise-free and support the approximate analytical model. The calculated density for 10 θ negative bias on the plate is compared with the measured profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339418
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  • 5
    Electronic Resource
    Electronic Resource
    Interfacial roughness effects on interlayer coupling in spin valves grown on different seed layers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 3023-3026 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the behavior of interlayer coupling in giant magnetoresistance spin valves as a function of seed layer composition and spacer layer thickness. Using in situ scanning tunneling microscopy, we have measured directly the roughness of the top surface of the lower ferromagnetic layer. We find that the seed layer composition is correlated to the roughnesses of the interfaces inside the spin valve. Interlayer coupling increases with decreasing Cu spacer layer thickness and with increasing interfacial roughness. Results favorably compare to a topographically derived magnetostatic interaction as described by a modified version of Néel's "orange peel" model. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372390
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  • 6
    Electronic Resource
    Electronic Resource
    Quasi permanent superconducting magnet of very high field (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 718-719 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on persistent field in a quasipermanent magnet made of high temperature superconductor. The material has an average of 40% molar excess of Y, relative to Y1Ba2Cu3O7 and has been irradiated with high energy light ions at 200 MeV. The magnet, which traps 1.52 T at 77.3 K, traps nearly 4 T at 64.5 K. No evidence of giant flux jump or sample cracking was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355237
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  • 7
    Electronic Resource
    Electronic Resource
    General solution for an asymmetric snowplow in Z-pinch-like geometry (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 3440-3442 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The simple snowplow model has been extended into two dimensions in an x-y geometry for the study of radially imploding plasmas with azimuthal density asymmetries. When reduced to dimensionless form à la Krall and Trivelpiece [Principles of Plasma Physics (McGraw-Hill, New York, 1973), pp. 123–128], the resultant family of solutions depend upon two parameters rather than one. A numeric algorithm for the solution of these equations has been developed and solutions for several choices of the parameters are shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860400
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  • 8
    Electronic Resource
    Electronic Resource
    Persistent magnetic fields trapped in high Tc superconductor (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1475-1477 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of field trapping by the incomplete Meissner effect was performed on YBa2Cu3O7−x at 77 K on both sintered and oriented grain samples. Fields of up to BT=1280 G have been trapped in small, oriented grain, planar samples. Circulating persistent current densities of up to 4800 A/cm2 are calculated. Based on these values hollow cylinders of 2 cm i.d. will trap fields of 6000 G. Initial creep is about 10%/week for both types of samples. Creep rate varies as (BT/BT,max)2. BT, due to an external field B0, is BT∝(1−e−cB0/BT,max). Lamination and mosaic assembly steps for producing practical magnets have been performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103207
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  • 9
    Electronic Resource
    Electronic Resource
    Enhanced levitation forces with field cooled YBa2Cu3O7−δ (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 3059-3061 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have examined levitation forces of field cooled (2.3 T) and zero field cooled YBa2Cu3O7−δ superconductors opposed by a SmCo magnet. We have achieved unusually large levitation forces (140 N) and pressures (44.6 N/cm2) in field cooled measurements. 5–10 subsequent cycles, of approach and retreat of the magnet, result in a 10–20% decrease in force, which then stabilizes. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121540
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  • 10
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscope surface imaging and etching of single crystals of the high-temperature superconductor Tl2Ba2CuO6+δ (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1506-1508 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the surface morphology of single-crystal bulk superconductors in the Tl-Ca-Ba-Cu-O system by scanning tunneling microscopy, observing surface etching phenomena in air at room temperature, including the formation of lines and pits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106293
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