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  • 1
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    Transient flow and heating in a pinched plasma column (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The axial flow and heating of an argon plasma in a pinched plasma column of a pulsed, linear z-pinch device was experimentally examined with a unique pressure sensing instrument capable of resolving mass flow properties. Transient axial pressure profiles identify periods of intense flow and heating. Mechanisms generating such effects are considered.
    Keywords: PHYSICS, PLASMA
    Type: Physics of Fluids; 17; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Flow characteristics in the exhaust of a pulsed megawatt gas fed arc (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The transient flow generated by a pulsed, megawatt-level, gas-fed arc with an applied magnetic nozzle has been examined with a new design piezoelectric pressure transducer. Sensor thermal conduction and accelerations have been examined and eliminated in the 500 microsec period of plasma flow. Existence of a large magnitude cold gas pressure front of 20 microsec duration has been reconfirmed and its relationship to the following plasma flow of about 200 microsec duration has been examined for the first time. At a point 30 cm from the arc source, initially near vacuum conditions (typically with an arc current of 11.2 kA and 1 tesla applied magnetic field), a pressure pulse of unionized gas with a magnitude of 10,000 N/sq m is followed by plasma flows with nearly constant impact pressure of 1000 N/sq m. Pressure and number density in this plasma region are seen to decrease with applied magnetic field strength.
    Keywords: PHYSICS, PLASMA
    Type: IEEE Transactions on Plasma Science; PS-1; Dec. 197
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  • 3
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    An investigation of transient pressures and plasma properties in a pinched plasma column (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The transient pinched plasma column generated in a linear Z-pinch was studied experimentally and analytically. The plasma column was investigated experimentally with several plasma diagnostics; they were: a rapid response pressure transducer, a magnetic field probe, a voltage probe, and discharge luminosity. Axial pressure profiles on the discharge chamber axis were used to identify three characteristic regions of plasma column behavior: (1) strong axial pressure asymmetry noted early in plasma column lifetime, (2) followed by plasma heating in which there is a rapid rise in static pressure, and (3) a slight decrease static pressure before plasma column breakup. Plasma column lifetime was approximately 5 microseconds. The axial pressure asymmetry was attributed to nonsimultaneous pinching of the imploding current sheet along the discharge chamber axis. The rapid heating could be attributed in part to viscous effects introduced by radial gradients in the axial streaming velocity.
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-126660 , PSU-AERSP-71-4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    An investigation of transient pressure and plasma properties in a pinched plasma column (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The transient pinched plasma column generated in a linear Z-pinch was studied experimentally and analytically. The plasma column was investigated experimentally with the following plasma diagnostics: a special rapid response pressure transducer, a magnetic field probe, a voltage probe and discharge luminosity. Axial pressure profiles on the discharge chamber axis were used to identify three characteristic regions of plasma column behavior; they were in temporal sequence: strong axial pressure asymmetry noted early in plasma column lifetime followed by plasma heating in which there is a rapid rise in static pressure and a slight decrease static pressure before plasma column breakup. Plasma column lifetime was approximately 5 microseconds. The axial pressure asymmetry was attributed to nonsimultaneous pinching of the imploding current sheet along the discharge chamber axis. The rapid heating is attributed in part to viscous effects introduced by radial gradients in the axial streaming velocity. Turbulent heating arising from discharge current excitation of the ion acoustic wave instability is also considered a possible heating mechanism.
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-124737 , PSU-AERSP-71-4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Pressure distribution in the structure of a propagating current sheet (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Pressure distribution in current sheet propagating into ambient argon
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-100693 , REPT-853
    Format: application/pdf
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  • 6
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    Transient flow and expansion of a pinch discharge plasma in self-induced magnetic fields. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: PHYSICS, PLASMA
    Type: AIAA PAPER 73-689 , Fluid and Plasma Dynamics Conference; Jul 16, 1973 - Jul 18, 1973; Palm Springs, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Pressure distribution in the structure of a propagating current sheet (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Gas kinetic pressure profile and mass density of propagating current sheet in argon pinch discharge, using piezoelectric transducer
    Keywords: PHYSICS, PLASMA
    Type: ; YSICA STATUS SOLIDI
    Format: text
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  • 8
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    Transient flow and heating characteristics in a pinched plasma column. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The generation of axial flow and heating of an argon plasma in a pinched plasma column of a pulsed, linear z-pinch device was examined experimentally and analytically. Transient (about 5 microsec) axial pressure profiles identify three characteristic periods in the column history. These include (1) strong axial pressure asymmetry indicative of plasma streaming, (2) isotropic, rapidly rising plasma pressure indicative of plasma heating, and (3) column breakup. An efficient conversion of radial collapse to axial streaming velocity is identified. Mechanisms for such an effect and subsequent heating are evaluated; significance to transients in pulsed plasma accelerators is identified.
    Keywords: PHYSICS, PLASMA
    Type: AIAA PAPER 72-208 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 17, 1972 - Jan 19, 1972; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Flow characteristics in the exhaust of a pulsed magawatt gas fed arc (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Transient pressure measurement in plasma exhaust flow of 500 microsec duration, discussing discharge temporal behavior and cold gas pressure front existence
    Keywords: PHYSICS, PLASMA
    Type: ANNUAL GASEOUS ELECTRONICS CONFERENCE; Oct 05, 1971 - Oct 08, 1971; GAINESVILLE, FL; US
    Format: text
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