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  • 1
    Electronic Resource
    Electronic Resource
    Beam and hot-spot formation in a low impedance line driven vacuum spark discharge (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4164-4167 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Observations of a vacuum spark discharge are presented using a coaxial line driver. A 120 ns, 1.5 Ω coaxial line is used to give peak discharges of 90 kA. The usual line spark gap is shorted out giving a new mode of operation. The discharge is initiated once the rising sinusoidal voltage is applied by focusing a Nd:YAG laser onto the cathode front surface, peak current is reached at 250 ns after this. Reproducible hot spot formation is observed at this time. Holographic interferometry combined with time and space resolved x-ray observations show emission from a dense anode plasma as well as from the dense plasma column in which hot spot forms at peak current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350819
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of the plasma jet formation in X-pinch plasmas using laser interferometry (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 5140-5147 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A two-frame Mach–Zender interferometer is used to investigate the dynamics of X pinches formed from two 10 μm aluminum wires at current levels of 100 kA. Particularly, the columns of plasma that form on the interelectrode axis of the X pinch are studied quantitatively. It is demonstrated that the plasma which forms these columns does not come solely from expansion of the corona from the limbs of the X pinch but rather predominantly from the crossing point region. The results suggest that the plasma column is indeed a jet which consists of several components. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1321317
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  • 3
    Electronic Resource
    Electronic Resource
    Observations of plasma dynamics in the vacuum spark (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3910-3916 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental observations are presented of a vacuum spark driven by a low impedance pulse forming line delivering 100 kA to the load. A pulsed laser is used to form a preionizing plasma on the cathode. The combination of axial and radial optical streak camera observations, together with the time and space resolved soft x-ray emission, permit the evolution of the plasma dynamics, density and temperature to be measured. Three kinds of behavior are observed according to axial position. A close correlation is found between the x-ray and the optical emission, with the observation of micropinch formation. A discussion is presented in which the behavior of the vacuum spark under differing operating conditions is compared. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871020
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  • 4
    Electronic Resource
    Electronic Resource
    Observations of the plasma dynamics of a vacuum spark from its soft x-ray emission (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3696-3702 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental observations of the plasma dynamics in a vacuum spark are presented which permit measurements of the electron density and temperature during a large part of the compression phase of the pinch. The vacuum spark is generated by a low-impedance pulse forming line with a maximum current in excess of 100 kA. The discharge is operated in the hybrid mode in a titanium plasma. A laser focused onto the cathode provides the preionizing source. Soft x-ray emission from the current sheath is observed with an x-ray framing camera well before maximum compression. These observations are compared with holographic interferograms, both showing the formation of an axisymmetric rhombic boundary to the plasma sheath. The temperature and density of both the sheath and the internal plasma are observed until the formation of hot spots at the time of maximum compression. The temperature evolution of the hot spots is presented, showing a repeatable behavior that depends on the axial position. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872265
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  • 5
    Electronic Resource
    Electronic Resource
    A capacitive probe array for measurements of ionization growth (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 2281-2283 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design and construction of a novel capacitive probe array to directly measure the ionization growth in high-voltage discharges is presented. By optimizing the design geometry, the probe output is made to be dependent only on the variation of charge development or potential changes at the vicinity of the probe in the interelectrode space. A set of these probes was used in an experiment to allow the time and space development of a virtual anode to be directly observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144677
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  • 6
    Electronic Resource
    Electronic Resource
    Optical design of a fast multiframe holographic interferometry system for transient plasma diagnostics (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3330-3331 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design of a fast multiframe holographic interferometry system for rapidly evolving transparent objects is described. Essential elements to the configuration are a multipulse laser, an electro-optic deflector (EOD), and a concave spherical mirror. The hologram, EOD and concave mirror are in a circle whose radius is the same as the spherical mirror. The different frames are superimposed on the same area of the hologram. On reconstruction separation of multiple images is achieved on the Fourier plane of a lens which is used to image the reconstruction of the hologram. The total number of optical components is kept to a minimum and only two of these are used in transmission. Due to the low component count the quality of interferograms obtained is very high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144300
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Deposition-induced defect profiles in amorphous hydrogenated silicon (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2448-2450 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thickness dependence of the subgap optical absorption in plasma-deposited hydrogenated amorphous silicon is carefully studied by photothermal deflection spectroscopy. The deep-level defect concentration decays from the top surface into the bulk where it approaches the thermal equilibrium defect density. This defect profile is interpreted in terms of the annealing, during growth, of growth-induced surface defects. It is also shown that this defect profile is compatible with the known growth-temperature dependence of the defect density in amorphous silicon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102905
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  • 8
    Electronic Resource
    Electronic Resource
    Breakdown characteristics of a laser-triggered pseudospark discharge (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1065-1067 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental observations are presented on the breakdown characteristics of a pseudospark discharge when a pulsed laser is used to illuminate the back surface of the cathode. The breakdown delay and jitter of the discharge are observed to be controlled by the laser. Observations are presented on the effect of the relative timing of the laser pulse with respect to the fast rising applied voltage. It is found that mJ illumination at up to tens of microseconds before the application of the voltage reduces significantly both delay to breakdown and jitter. High laser energy, applied after the voltage is established across the anode-cathode region, leads directly to breakdown with a delay of less than 100 ns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101706
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  • 9
    Electronic Resource
    Electronic Resource
    Simple Faraday cup with subnanosecond response (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 141-142 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A small Faraday cup of coaxial design for use in plasma physics experiments is presented. The construction permits an approximately 50-Ω geometry to be maintained, allowing direct coupling to coaxial cable. The detector rise time is less than 0.4 ns, and is designed for beam currents of between 0.1 and 100 A. The design is well screened to reject spurious electrical noise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140572
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  • 10
    Electronic Resource
    Electronic Resource
    Dependence of cathode aperture in pulsed hollow-cathode discharges (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 32-34 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of electric field penetration in the hollow-cathode region of self-initiated pulsed hollow-cathode discharge is investigated. The discharge is operated in hydrogen at pressures between 30 and 200 mTorr with applied voltages between 10 and 30 kV. Aluminum cathodes with aperture diameters and lengths from 1 to 5 and 2 to 18 mm, respectively, are used. The results show that the effect of the hollow cathode in discharge initiation is particularly strong at low pressures. In the range of parameters investigated, the time delay to breakdown and the jitter decrease when cathode aperture with larger diameters and shorter lengths are used. At high pressure the pulsed hollow-cathode effect is less important as ionization processes in the main gap become dominant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107357
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