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  • 1
    Electronic Resource
    Electronic Resource
    X-ray generation from a gas-puff z-pinch driven by a pulsed power generator with a self-crowbar switch (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2403-2404 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A self-crowbar switch was operated on the pulsed power generator LIMAY-I and applied to a gas-puff z-pinch load. The radial collapse of the plasma is demonstrated to occur with the aid of the self-crowbar switch after the applied power pulse has turned off. X-ray emission was observed to coincide with radial collapse of the plasma, and the pinched plasma was visually observed by an x-ray pinhole photograph. The x-ray intensity increased with decrease of the puffed gas density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143896
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  • 2
    Electronic Resource
    Electronic Resource
    A novel scheme of laser interferometer–refractometer with high spatial and temporal resolutions (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 4353-4356 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel scheme combining interferometer and refractometer for simultaneous plasma density and plasma density gradient measurements is described. The scheme employs a ribbon laser beam obtained from one-dimensional laser beam expansion by a pair of cylindrical lenses. This beam shape allows measurements at several spatial locations simultaneously. The beam deflection measurements give additional important information on the spatial distribution of plasma density gradient in the direction perpendicular to the major axis of the expanded beam. Fast pin photodiodes are used as light detectors for temporal resolution better than 1 ns. The high power (700 mW) of the argon ion laser allows 0.1° phase resolution and simultaneously 0.1 mrad refractional deflection angle resolution. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148396
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  • 3
    Electronic Resource
    Electronic Resource
    Augmented railgun using a permanent magnet (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4227-4232 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The use of a permanent magnet instead of an electromagnet has been proposed for the augmentation of the magnetic field of a railgun driven by a current of approximately 20 kA. A permanent magnet has the following advantages in comparison with conventional augmentations using additional turns: (1) simple configuration of the system, (2) temporally and spatially constant magnetic fields, and (3) high efficiency. Here, the operation of a conventional railgun and that of an augmented railgun using a permanent magnet are compared experimentally, and the usefulness of the permanent magnet is described. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145374
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of laser beam deflection on the accuracy of interferometer measurements (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1584-1586 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The laser interferometry is a frequently used diagnostics for plasma density measurements. The measurements in plasmas with no density gradients allow direct correspondence of the fringe shift and plasma density along the laser line of sight. The change of the interferometer contrast due to scene beam deflection in plasmas with density gradients reduces the fidelity of interferometer measurements due to the change in the contrast of the fringe. The analytic expression for the maximum acceptable deflection angle is derived, analyzed, and compared to the experiment. Ways to improve the accuracy of interferometer measurements are proposed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148868
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  • 5
    Electronic Resource
    Electronic Resource
    Repetitively operated plasma opening switch using laser produced plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2378-2380 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A plasma opening switch using laser produced plasma is successfully operated at repetition rates up to 3.3 pulses per second. It is shown that the switch performance has good reproducibility without any maintenance. Reliability tests indicate that the switch lifetime is limited by the volume of the target material and the lifetime of the energy storage capacitor. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148120
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  • 6
    Electronic Resource
    Electronic Resource
    Radiative recombination in near-surface strained Si1−xGex/Si quantum wells (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3602-3604 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Influence of the surface on the radiative recombination is studied in near-surface (NS) strained Si1−xGex/Si quantum wells (QWs). The luminescence intensity of NSQWs is clearly diminished as the Si cap thickness decreases due to carrier capture to the surface. However, the luminescence diminution discloses a saturable behavior with increasing excitation density. Time-resolved measurements reveal selective electron capture to surface traps as being the controlling process in the luminescence attenuation, and there is no signature of quantum mechanical hole tunneling to the surface. Results of potential-biased luminescence lend further support to the electron-controlled picture of the luminescence attenuation in Si-based near-surface geometry. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115331
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  • 7
    Electronic Resource
    Electronic Resource
    Transport properties of two-dimensional electron gas in AlGaAs/GaAs selectively doped heterojunctions with embedded InAs quantum dots (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3444-3446 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transport properties of two-dimensional electron gas (2DEG) are studied in selectively doped GaAs/n-AlGaAs heterojunctions, in which nanometer-scale InAs dots are embedded in the vicinity of the GaAs channel. When the distance Wd between the InAs dot layer and the channel is reduced from 80 to 15 nm, the mobility μ of electrons at 77 K decreases drastically from 1.1×105 to 1.1 ×103 cm2/V s, while the carrier concentration increases from 1.1×1011 to 5.3×1011 cm−2. Such a reduction of mobility is found only when the average thickness of InAs layer is above the onset level (∼1.5 monolayer) for the dot formation. Origins of these changes in μ and Ns are discussed in connection with dot-induced modulations of the electronic potential V(r) in the channel. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115274
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  • 8
    Electronic Resource
    Electronic Resource
    Repetitive operation of water-filled Blumlein generator (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 2759-2763 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A water-filled Blumlein generator was operated at different repetition rates of up to 15 Hz, and its temporal performance was investigated. The Blumlein generator having an impedance of 10 Ω provides a rectangular voltage pulse with an amplitude of 200 kV and a duration of 75 ns into a matched load. The resistance of the water in the line decreases quickly at 〉10 Hz during a continuous operation for an hour and results in a decrease in the output voltage of the Blumlein line. The generator works with a repetition rate of up to 6 Hz without serious degradation in the voltage, while the averaged power density dissipated in the water is approximately 40 mW/cm3. The increase in the water temperature during operation is only a few degrees. This implies that the resistive heating of the water is not the dominant cause of the decrease in the water resistance. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1372174
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  • 9
    Electronic Resource
    Electronic Resource
    Performance of a 1.5 m augmented railgun using a permanent magnet (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 1908-1909 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A 1.5 m augmented railgun using a permanent magnet (ARGPM) has been assembled and tested. The goal of this work is to demonstrate fusion pellet injection with an extremely high velocity, in excess of 5 km/s. In this work, a wood fiber projectile is accelerated up to a velocity of 3.3 km/s in a plasma armature railgun without preaccelerators. Also, the velocity possible for a very light projectile accelerated by the ARGPM is discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147625
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  • 10
    Electronic Resource
    Electronic Resource
    Role of electron clusters—Ectons—in the breakdown of solid dielectrics (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 4484-4487 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new approach is proposed for the description of early breakdown phenomena in solid dielectrics based on the appearance and action of the ectons—electron clusters in the contact point metal–solid dielectric–insulating liquid. An ecton is a result of the electric microexplosion of the electrode inhomogeneity at the triple point by the prebreakdown current described as the displacement current in a dynamic plasma-to-ground capacitor. Ecton appearance becomes possible due to the existence of partial flashover with plasma formation in these points. An ecton is a high-power source of charged particles and pulsed pressure. Injection of the charged particles into a solid dielectric and its local mechanical destruction by the pressure pulses result finally in the breakdown of the solid dielectric. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873186
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