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  • 1
    Electronic Resource
    Electronic Resource
    Charge-to-mass separation in a current coaxial lens (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 6368-6371 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present results demonstrating the charge state separation of an ion beam in a purely cylindrical geometry using the azimuthal magnetic field of a straight conductor. This geometry, called a current coaxial lens, has advantages for the analysis of intense ion beams where it is important to minimize space charge blow-up of the beam due to loss of space charge neutralization. A metal vapor vacuum arc ion source was used to produce an annular, low energy, aluminum ion beam of total beam current several tens of milliamperes and with charge state components Q=1+, 2+, and 3+ at energies of 20, 40, and 60 keV, respectively. Separation of the three different charge state fractions of the beam was measured. The method has been shown to be effective for the case when the beam pulse is long compared to all ion transit times involved and the beam current is high in terms of the need for space charge neutralization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346883
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  • 2
    Electronic Resource
    Electronic Resource
    The electrical and electrochemical properties of gold-plated InP (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3238-3245 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical properties of InP/Au dry contacts and the influence of electrodeposited gold on the electrochemical properties of InP electrodes were studied. From current and impedance measurements on InP/Au dry contacts it is concluded that the chemical composition of an interfacial layer strongly influences the electrical characteristics. Furthermore, interface states are shown to play an important role. The interfacial layer and the interface states also determine to a large extent the electrochemical properties of the gold-plated electrodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354598
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  • 3
    Electronic Resource
    Electronic Resource
    Optical studies of germanium implanted with high dose oxygen (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4788-4794 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model has been developed to explain the greatly reduced reflectivities of Ge samples implanted to doses 1.25–1.5×1018 O/cm2 with 45-keV O+ ions, which have reflectivity values close to zero at 0.7 μm. The model divides the inhomogeneous implanted layer into a series of homogeneous sublayers with different volume fraction and thickness for each sublayer. The complex refractive indexes for every sublayer are calculated using the Maxwell Garnett (MG) and Persson–Liebsch (PL) theories. Using the expressions for the reflectivity of an absorbing multilayer layer systems, the reflectivities have been calculated. The reflectivity curve calculated in the PL approximation is closer to the experimental observations than is the MG approximation over the wavelength range 0.2–3.0 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346135
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  • 4
    Electronic Resource
    Electronic Resource
    Fine-structure mixing within the Zn(4 3PJ) multiplet by collisions with the noble gases (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 5481-5487 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measurements of rate coefficients for intramultiplet state transfer of Zn(4 3P1→4 3PJ') by collisions with the rare gases are presented. The state-to-state binary rate coefficients are derived from least-squares fittings of the time-resolved triexponential behavior of the 4 3P1 fluorescence. These rate coefficients were studied systematically over a temperature range of 690–1100 K in order to characterize the velocity dependence of the collisional coupling. The systematic behavior of the rate coefficients with varying temperature and noble gas species is qualitatively consistent with a nearly adiabatic coupling limit for noncrossing levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460483
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  • 5
    Electronic Resource
    Electronic Resource
    Voltage monitors for high-power 10–20 MV pulsed electron accelerators : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4795-4798 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Four monitoring techniques that can determine peak voltage (Vp) to a precision of ∼5% for high-intensity, pulsed electron accelerators operating in the 10 to 20 MV range are discussed and applied to the 14-TW HERMES III accelerator. The techniques utilize parapotential flow theory, the range of H− ions, the bremsstrahlung from electron interactions with an electron target, and the photoneutron fluence from neutrons generated in a bremsstrahlung target. Application of these techniques to HERMES III shows that when the accelerator is operating under nominal conditions, Vp=(18.7±0.7) MV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143566
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  • 6
    Electronic Resource
    Electronic Resource
    Direct-drive laser-fusion experiments with the OMEGA, 60-beam, 〉40 kJ, ultraviolet laser system (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2108-2112 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: OMEGA, a 60-beam, 351 nm, Nd:glass laser with an on-target energy capability of more than 40 kJ, is a flexible facility that can be used for both direct- and indirect-drive targets and is designed to ultimately achieve irradiation uniformity of 1% on direct-drive capsules with shaped laser pulses (dynamic range (approximately-greater-than)400:1). The OMEGA program for the next five years includes plasma physics experiments to investigate laser–matter interaction physics at temperatures, densities, and scale lengths approaching those of direct-drive capsules designed for the 1.8 MJ National Ignition Facility (NIF); experiments to characterize and mitigate the deleterious effects of hydrodynamic instabilities; and implosion experiments with capsules that are hydrodynamically equivalent to high-gain, direct-drive capsules. Details are presented of the OMEGA direct-drive experimental program and initial data from direct-drive implosion experiments that have achieved the highest thermonuclear yield (1014 DT neutrons) and yield efficiency (1% of scientific breakeven) ever attained in laser-fusion experiments. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871662
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  • 7
    Electronic Resource
    Electronic Resource
    Approximate description of the two-dimensional director field in a liquid crystal display (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 4777-4786 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model for describing properties of a liquid crystal display which combines the concepts of in-plane switching and vertical alignment is proposed. There is good agreement between the results of this model and direct computer calculation of the director and the light transmittance. The usefulness of the model lies in the faster speed of calculations compared to direct computer solution of the Euler–Lagrange equations. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1359423
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  • 8
    Electronic Resource
    Electronic Resource
    The upgrade to the OMEGA laser system : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 508-510 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The upgrade to the OMEGA laser system, a 30-kJ, 351-nm, 60-beam direct-drive laser-fusion system is reported here. The system configuration is presented along with the status of its construction and the plans for system activation. The system utilizes rod and disk amplifiers and frequency tripling to produce UV pulses which are smoothed using phase conversion and smoothing by spectral dispersion. Dual driver lines will feed the propagation of two co-axial beams, which have different pulse widths and occupy different portions of the laser aperture. The laser system will be completed in November 1994 and the target area in March 1995. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146333
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  • 9
    Electronic Resource
    Electronic Resource
    Numerical investigation of the self-focusing of broad-bandwidth laser light with applied angular dispersion (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2027-2035 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The self-focusing of phase-modulated broad-bandwidth (BBW) laser light, in which the spectral components are angularly dispersed to produce smoothing of laser nonuniformities, is analyzed. A multifrequency, multidimensional computer code has been developed to simulate the propagation of angularly dispersed BBW light within a nonlinear medium. Earlier work has shown that the self-focusing behavior of phase-modulated BBW light without angular dispersion is insignificantly different from that of monochromatic beams. With the addition of angular dispersion, pure phase modulation cannot be maintained during propagation, and the beam becomes subject to the development of spatial amplitude modulation which moves across the beam in time. Instantaneously, this amplitude modulation will begin to self-focus in a nonlinear medium. However, when examined over one period of the phase modulation, the time-integrated intensity (TII) due to the angularly dispersed BBW beam is consistently smooth, regardless of the amount of propagation modulation or self-focusing growth present in the instantaneous profile. Similarly, the angular dispersion will produce a time-dependent deflection of any amplitude modulation on the beam produced by laser defects. Because the focus of the modulation is enlarged due to the deflection, the TII of this amplitude structure is found to be less than that for a monochromatic beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357670
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  • 10
    Electronic Resource
    Electronic Resource
    The chemical oxidation of hydrogen-terminated silicon (111) surfaces in water studied in situ with Fourier transform infrared spectroscopy (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 8121-8127 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The chemical oxidation of hydrogen-terminated silicon (111) surfaces in water was studied in situ with Fourier transform IR spectroscopy in the multiple total internal reflection mode. On the basis of measurements of the absorbance of the Si-H and Si-O-Si vibrations as a function of time it is concluded that reactions involving the oxidation of silicon hydride and the formation of silicon oxide are coupled. The decrease in the hydride coverage and increase in the oxide coverage are linear functions of ln(t). The time dependence of oxide growth is explained in terms of electrostatic and mechanical changes at the Si/water interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356510
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