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  • Electronic Resource  (30)
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  • 1
    Electronic Resource
    Electronic Resource
    Thomson scattering in the corona of laser-produced gold plasmas : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 668-671 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Thomson scattering measurements of the electron temperature in laser-produced gold plasmas are presented. We irradiated a flat gold disk target with one laser beam of the Nova laser facility at an angle of 64° from the normal. A second laser beam probed the plasma at a distance of 500 μm with temporally resolved Thomson scattering. The electron temperature measurements are compared with hydrodynamic simulations using the code LASNEX for experiments applying smoothed and unsmoothed heater beams. In case of an unsmoothed heater beam the simulations predict temperatures which are about 40% higher than our measured data. Although the agreement is improved for a smoothed heater beam, discrepancies exist in the decay phase of the plasma. We discuss possible explanations for these observations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147595
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  • 2
    Electronic Resource
    Electronic Resource
    X-ray backlighting for the National Ignition Facility (invited) : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 627-634 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: X-ray backlighting is a powerful tool for diagnosing a large variety of high-density phenomena. Traditional area backlighting techniques used at Nova and Omega cannot be extended efficiently to National Ignition Facility scale. New, more efficient backlighting sources and techniques are required and have begun to show promising results. These include a backlit-pinhole point-projection technique, pinhole and slit arrays, distributed polychromatic sources, and picket-fence backlighters. In parallel, there have been developments in improving the data signal-to-noise and, hence, quality by switching from film to charge-coupled-device-based recording media and by removing the fixed-pattern noise of microchannel-plate-based cameras. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1315641
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  • 3
    Electronic Resource
    Electronic Resource
    Thomson scattering from two-species laser-produced plasmas (invited) : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 641-646 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report on recent Thomson scattering measurements from two ion species laser-produced plasmas. A flat disk coated with multiple alternate thin layers of gold and beryllium was irradiated with one laser beam of the Nova laser facility and the resulting two ion species plasma was probed with a second laser beam at a distance of 500 μm with time-resolved spectroscopy of the Thomson scattered light. A controlled variation of the Au fraction of the plasma was achieved by changing the relative thicknesses of the individual multilayers of the target. Two ion acoustic waves belonging to the Au and Be species were clearly observed. Besides their usual application to deduce electron temperatures, the relative damping of both waves provides an accurate measurement of the ion temperature of the plasma. In addition, the relative ion densities can be measured with high accuracy from the relative phase velocities of both waves if the ion charge state is known independently or vice versa. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147908
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  • 4
    Electronic Resource
    Electronic Resource
    X-ray diagnostics of hohlraum plasma flow : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 831-833 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this study we use spectroscopy and x-ray imaging to investigate the macroscopic plasma flow in mm-sized laser-produced hohlraum plasmas. By using multiple diagnostics to triangulate the emission on a single experiment, we can pinpoint the position of dopants placed inside the hohlraum. X-ray emission from the foil has been used in the past to measure electron temperature. Here we analyze the spatial movement of dopant plasmas for comparison to hydrodynamic calculations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147701
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  • 5
    Electronic Resource
    Electronic Resource
    Spin-dependent electron interferometry (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7142-7143 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We use interference of electron waves in a quantum well to switch the spin polarization of electrons. The spin quantum resonator consists of a Cu-film of variable thickness sandwiched between vacuum and a magnetic Co-film. Electrons are injected into the resonator from the vacuum side. The Co-film provides a spin dependent reflector. Varying the resonator thickness results in periodic modulation of the spin polarization of the incoming electrons. We use spin interferometry to measure the divergence of the period of interlayer exchange coupling upon approaching a zone boundary. We propose that interferometric spin selection should be observable in spin polarized scanning tunneling spectroscopy. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372957
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  • 6
    Electronic Resource
    Electronic Resource
    A theoretical study of a laser-irradiated capillary discharge (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 1632-1640 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical study of a laser-irradiated capillary discharge is presented. The discharge produces a columnar flow of low-temperature plasma (1 eV) with a density of 1019 atoms/cm3. This ambient low-temperature plasma is then irradiated by a 1.06-μm Nd glass laser with pulse lengths from 100 ps to 1 ns. The resultant plasma is studied, using hydrodynamic simulations coupled to a detailed kinetics model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344377
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  • 7
    Electronic Resource
    Electronic Resource
    Nonlinear timing shift in high frequency magnetic recording determined with time resolved Kerr microscopy (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 3377-3381 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: As we move to higher data rates and higher areal densities, nonlinear effects start to determine the data patterns written on a hard disk. In this context it is necessary to develop methods that can help to determine the origin of nonlinear effects, e.g., that can help to distinguish between nonlinear effects caused by areal density from transient effects caused by high data rates. In this article we concentrate on the latter and show data for nonlinear timing shift measured directly on the air bearing surface of recording heads by means of time resolved magneto-optical Kerr microscopy. We compare the data to a simple t/(t+τ) model for the head field rise time. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371216
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy oscillations (invited) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5054-5057 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic anisotropy in Co films epitaxially grown on Cu(001) is investigated by measuring magneto-optical Kerr hysteresis loops during film growth. As a function of Co thickness the magnetic anisotropy oscillates with a period of 1 monolayer. These oscillations are attributed to the periodic variations of the film morphology alternating between filled and incompletely filled atomic layers. Upon coverage of the Co films with Cu overlayers the anisotropy of the magnetic film is found to oscillate with increasing Cu layer thickness. We relate these oscillations to quantum interferences due to the confinement of electrons in ultrathin films. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364506
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic switching in ultrashort field pulses (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3966-3966 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Ginzburg–Landau–Lifshitz (GLL) equation, which describes the time dependence of spin precesssion in an external magnetic field1 relates the minimal field required to reverse the magnetization at fixed pulse length to the anisotropy field of the sample.23 We have systematically varied this parameter between 1.3 and about 5.0 T in a series of perpendicularly magnetized Co/Pt multilayer films and studied the magnetization reversal in picosecond in plane field pulses. Such pulses of several Tesla field strength and ultrashort duration were obtained in the final focus test beam section of the Stanford Linear Accelerator Center. The resulting magnetization pattern, which is reminiscent of the field during exposure, is subsequently analyzed with Kerr microscopy2 (see Fig. 1). As a prominent feature, we observe a beam field related switching radius from up to down magnetization which we compare to the theoretically expected field within the GLL formalism.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365024
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  • 10
    Electronic Resource
    Electronic Resource
    K- and L-shell absorption spectroscopy of laser-produced plasmas (invited) : Proceedings of the 9th topical conference on high temperature plasma diagnotics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 5008-5011 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Diagnostic by Kα and Lα,β absorption spectroscopy leads to information on the ionization state, the electronic temperature, and matter density of laser-produced plasmas. In particular, a mapping of the ionic populations is possible by recording the spectra on space-resolved x-ray spectrographs. The plasma to be probed and the x-ray backlighter source are produced by different beams of the same frequency-doubled Nd laser. Kα spectroscopy probes F-like to He-like ions and Lα,β spectroscopy is a diagnostic of higher atomic number ions stripped into configurations around the Ca-like structure. Measurements of dense matter radiatively heated at temperatures around 50–100 eV in laser-irradiated multilayered targets or x-ray heated samples evidence the effect of radiative heating on the temperature gradient in the target. The space and time-resolved measurements of the corona of a low temperature aluminum plasma are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143475
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