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Digitale Medien

Effective charge parametrization for 7Li, 11B, 12C, 14N, 16O, 27Al, 28Si, 31P, 32S, and 35Cl projectiles traversing Mylar targets (1996)

Porter, L. E.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 80 (1996), S. 1901-1903

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Some recent measurements of the stopping powers of Mylar foils for 0.2–2.1 MeV/u 7Li, 11B, 12C, 14N, 16O, 27Al, 28Si, 31P, 32S, and 35Cl projectiles have been subjected to analysis in terms of the modified Bethe–Bloch theory in order to obtain values of projectile effective charge parameters. Although both one- and two-parameter fits were attempted, only the former yielded meaningful results. The one-parameter fits manifested considerable internal consistency, and reasonable consistency with results obtained in recent similar analyses of Kapton, Havar, and nickel stopping powers for 7Li, 11B, 12C, 14N, and 16O projectiles. © 1996 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.363004

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2

Digitale Medien

Irregular grain structure in micromagnetic simulation : The 40th annual conference on magnetism and magnetic materials (1996)

Porter, D. G. ; Glavinas, E. ; Dhagat, P. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 79 (1996), S. 4695-4697

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A randomized microstructure based on the Voronoi diagram is proposed for micromagnetic models. Simulations illustrate variability of extrinsic magnetic properties with microstructure, medium noise dependence on medium properties, and jitter dependence on trackwidth. © 1996 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.361708

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3

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Properties of a vacuum ultraviolet laser created plasma sheet for a microwave reflector (1995)

Shen, W. ; Scharer, J. E. ; Lam, N. T. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 78 (1995), S. 6974-6979

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A 193 nm excimer laser and a custom fabricated cylindrical lens system is used to produce a plasma sheet of 8 cm×30 cm×0.4 cm in tetrakis(dimethylamino)ethylene (TMAE), a low ionization energy organic gas. Plasma density variation due to photon absorption is studied by scanning the filling pressure of TMAE between 12 and 150 mTorr. A high density (n≥2.0×1013 cm−3), low temperature (Te≈0.8 eV) plasma sheet of 4 mm thickness is obtained with less than 50% spatial density variation over the 30 cm axial length. Charge recombination is found to be the dominant process for t≤1.2 μs with the plasma diffusion playing a perturbational role. A one-dimensional plasma model is utilized to model the experimental plasma data by treating the diffusion as a perturbation. This study shows that the recombination coefficient is 1.8±0.1×10−7 cm3 s−1 and the diffusion coefficient is 2.8±0.4×104 cm2 s−1. The plasma sheet has attractive properties for a microwave agile mirror. © 1995 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.360773

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4

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Empirical bond-order potential description of thermodynamic properties of crystalline silicon (1997)

Porter, Lisa J. ; Yip, Sidney

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 81 (1997), S. 96-106

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Thermodynamic properties of silicon (diamond cubic phase) are calculated using an empirical many-body potential developed by Tersoff [Phys. Rev. Lett. 56, 632 (1986)] based on the concept of bond order. It is shown that this model gives predictions in good agreement with experiment for those properties governed by energetics (free energy, entropy, and heat capacity). The thermal expansion coefficient is less well described, which is traced to the fact that the model potential, in its present version, is overly stiff and therefore unable to account properly for the volume dependence of the transverse acoustic modes. Furthermore, sensitivity of the potential to whether each atom remains bonded to only four neighbors indicates that the short-range nature of the potential may necessitate model improvement before it is suitable for studies of thermomechanical properties at elevated temperatures or large deformations. © 1997 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.364102

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5

Digitale Medien

Track-width dependence of transition jitter : The 40th annual conference on magnetism and magnetic materials (1996)

Dhagat, P. ; Glavinas, E. ; Jander, A. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 79 (1996), S. 5652-5654

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A simple model that represents the microstructure of magnetic medium as a rectangular tesselation predicts that the mean-square jitter is inversely proportional to the track width. We test this prediction using different width heads as well as creating different track widths by partially erasing the original track. We also simulate these experiments using a micromagnetic model. Our experimental and simulation results are found to be in agreement with the prediction. © 1996 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.362271

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6

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Sensitivity measurements of a microchannel plate intensified x-ray detector in the 100–1500 eV photon energy range (abstract) : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)

Ruggles, L. E. ; Porter, J. L. ; Simpson, W. W. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 70 (1999), S. 646-646

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: Microchannel plate intensified (MPI) x-ray detectors are commonly used for imaging and spectral measurements in the 100–1500 eV photon energy range. Using a laser-produced plasma x-ray source, we measured the integrated detector response versus incident x-ray intensity and the relative efficiency versus photon energy of a MPI x-ray detector. Two identical 2000 lines/mm transmission grating spectrometers simultaneously record broadband plasma source emission from a tantalum target. The relative efficiency was determined by comparing the spectrum recorded with an absolutely calibrated x-ray CCD reference detector on one spectrometer to the spectrum recorded with a MPI x-ray detector on the other spectrometer. The integrated detector response versus incident x-ray intensity was measured by simultaneously illuminating the CCD reference detector and the MPI detector with step-wedge-filtered magnesium plasma emission. The aluminum step wedge x-ray filters pass the 1s–2p emission lines of H-like Mg at 1470 eV and the 1s2–1s2p emission lines of He-like Mg at 1350 eV, and provide a four order of magnitude range in incident intensity on the detectors.© 1999 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1149525

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7

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Calibration of a time-resolving spectrometer in the 100–800 eV spectral region (abstract) : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)

Ruggles, L. E. ; Porter, Jr., J. L.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 68 (1997), S. 1063-1063

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: We are calibrating a new time-resolving x-ray spectrometer used to diagnose z-pinch driven hohlraums at the Saturn Facility. The instrument uses a 5000 lines/mm transmission grating dispersing element and has an array of silicon photodiodes and a gated microchannel-plate detector for recording spectra. The diodes are located every 50 eV from 100 to 850 eV (E/ΔE=10) and have subnanosecond temporal and near-theoretical quantum efficiency. The microchannel-plate detector uses a 6.25 Ω gold stripline to record both a 5 ns frame of continuous spectrum and shadows of each silicon diode in the spectrum. This poster describes measurements of the spectral sensitivity of the instrument, including relative grating order efficiencies, microchannel-plate detector efficiency, and absolute sensitivity and time response of the silicon diodes.© 1997 American Institute of Physics. [S0034-6748(97)71001-3]

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1147788

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8

Digitale Medien

Streaked laser shadowgraphy of tungsten wire array implosions on the Saturn generator : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)

Deeney, C. ; McGurn, J. ; Noack, D. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 68 (1997), S. 653-655

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A combination of a 400 ns, 300 mJ, 640 nm dye laser, and an optical streak camera have been used to demonstrate that time-resolved shadowgrams can be made of the implosion phase of tungsten wire arrays. Initial experiments have shown that mirror lifetime and spatial resolution are issues for this diagnostic technique. Nonetheless, these experiments have provided new information on wire array dynamics; specifically, they show that even with a 0.46 mm wire spacing, the high density regions formed by the wires, are separate until 30 ns into the main drive current. Peak currents of 6.6 MA were obtained 40 ns after the start of the current, while peak radiated powers of 85 TW were measured at 50 ns. © 1997 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1147757

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9

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Target diagnostic system for the national ignition facility (invited) : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)

Leeper, R. J. ; Chandler, G. A. ; Cooper, G. W. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 68 (1997), S. 868-879

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A review of recent progress on the design of a diagnostic system proposed for ignition target experiments on the National Ignition Facility (NIF) will be presented. This diagnostic package contains an extensive suite of optical, x ray, gamma ray, and neutron diagnostics that enable measurements of the performance of both direct and indirect driven NIF targets. The philosophy used in designing all of the diagnostics in the set has emphasized redundant and independent measurement of fundamental physical quantities relevant to the operation of the NIF target. A unique feature of these diagnostics is that they are being designed to be capable of operating in the high radiation, electromagnetic pulse, and debris backgrounds expected on the NIF facility. The diagnostic system proposed can be categorized into three broad areas: laser characterization, hohlraum characterization, and capsule performance diagnostics. The operating principles of a representative instrument from each class of diagnostic employed in this package will be summarized and illustrated with data obtained in recent prototype diagnostic tests. © 1997 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1147917

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10

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Characterization of a high-speed x-ray imager (abstract)a) : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)

Ruggles, L. E. ; Spielman, R. B. ; Porter, J. L. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 66 (1995), S. 712-712

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: We are building a new time-resolving x-ray pinhole camera to image z pinches at the Saturn facility. The instrument is designed to have a spatial resolution of 64 μm for 2 keV photons, and a temporal resolution of 100 ps. The microchannel-plate-intensified detector will have nine, 20-mm-wide gold striplines. Each stripline will have an impedance of 5.55 Ω. We will present measurements of the temporal resolution of the detector, and describe new high-voltage gating circuitry designed to drive the low-impedance striplines. © 1995 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1146266

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