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  • 1970-1974  (30)
  • 1
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    Hollow cathode, quasi-steady MPD arc (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A quasi-steady MPD accelerator has been operated with four different hollow cathodes over a power range from 5 kilowatts to 5 megawatts. The absolute level of the argon mass flow, as well as the fractional division of the flow between the cathode and the six standard chamber injectors, is varied over a range of 1 to 12 grams per second. For a fixed total current, it is observed that the voltage increases monotonically with mass flow rate, compared to the usual experience with solid cathodes where the voltage decreases with mass flow rate. For a fixed percentage of flow through the cathode, each hollow cathode configuration displays a minimum impedance at a particular value of the total mass flow. It is asserted that in order to keep the discharge inside the hollow cathode the magnetic pressure and gasdynamic pressure have to match inside the cavity.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: NASA-CR-127749 , REPT-1023
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Quasi-steady magnetoplasmadynamic arc characteristics (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Multimegawatt quasi-steady MPD arc accelerator in millisecond pulses, noting applicability to experiments requiring long exposure times
    Keywords: PHYSICS, PLASMA
    Type: AIAA PAPER 70-1095
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Pulsed electromagnetic gas acceleration Semiannual progress report, 1 Jan. - 30 Jun. 1970 (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Pulsed electromagnetic gas acceleration
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-110883 , REPT-634O , SAPR-16
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Exploratory electromagnetic thruster research, phase 3, 23 June - 23 December 1969 (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Performance evaluation of MPD arc jets operating in quasi-steady modes
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-66923 , FR-020-9297
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Pulsed electromagnetic gas acceleration Semiannual progress report, 1 Jul. - 31 Dec. 1969 (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Exhaust velocities of arc plasma flow in pulsed electromagnetic gas accelerator
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-109408 , AMS-634N , SAPR-15
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Energy transfer from a pulse network to a propagating current sheet (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Energy transfer from pulse network to mass associated with propagating current sheet in linear pinch discharge, discussing pulsed plasma accelerator efficiency
    Keywords: PHYSICS, PLASMA
    Type: AIAA PAPER 69-113 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, AEROSPACE SCIENCES MEETING, 7TH; Jan 20, 1969 - Jan 22, 1969; NEW YORK, NY|; YAL SOCIETY (
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Acceleration patterns in quasi-steady MPD arcs (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Quasi-steady coaxial MPD arcs characteristics, studying Ar ion velocities, electrostatic ion acceleration mechanism and arc voltage gradient
    Keywords: PROPULSION SYSTEMS
    Type: AIAA PAPER 70-165 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, AEROSPACE SCIENCES MEETING, 8TH; Jan 19, 1970 - Jan 21, 1970; NEW YORK, NY
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Repetitively-pulsed quasi-steady vacuum MPD arc (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Repetitively pulsed quasi-steady vacuum arc magnetoplasmadynamic accelerator for propulsion, using electrolytic capacitors as power source
    Keywords: PROPULSION SYSTEMS
    Type: AIAA PAPER 70-167 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, AEROSPACE SCIENCES MEETING, 8TH; Jan 19, 1970 - Jan 21, 1970; NEW YORK, NY
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Pulsed electromagnetic gas acceleration (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Detailed measurements of the axial velocity profile and electromagnetic structure of a high power, quasi-steady MPD discharge are used to formulate a gasdynamic model of the acceleration process. Conceptually dividing the accelerated plasma into an inner flow and an outer flow, it is found that more than two-thirds of the total power in the plasma is deposited in the inner flow, accelerating it to an exhaust velocity of 12.5 km/sec. The outer flow, which is accelerated to a velocity of only 6.2 km/sec, appears to provide a current conduction path between the inner flow and the anode. Related cathode studies have shown that the critical current for the onset of terminal voltage fluctuations, which was recently shown to be a function of the cathode area, appears to reach an asymptote for cathodes of very large surface area. Detailed floating potential measurements show that the fluctuations are confined to the vicinity of the cathode and hence reflect a cathode emission process rather than a fundamental limit on MPD performance.
    Keywords: PLASMA PHYSICS
    Type: NASA-CR-140996 , SAR-634W
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Pulsed electromagnetic gas accelleration (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Direct measurement with thermocouples of the power deposited in the anode of a multi-megawatt magnetoplasmadynamic discharge has shown the fractional anode power to decrease from 50% at 200 kW to 10% at 20 MW. Using local measurements of current density, electric potential, and electron temperature, the traditional model for heat conduction to the anode is found to be inadequate. Other experiments in which the voltage-current characteristics and exhaust velocities of MPD arcs using Plexiglas and boron nitride chamber insulators and various mass injection configurations show that ablation can affect nominal accelerator operation in several distinct ways. The incorporation of a hollow cathode in a 7 kA plasma discharge has shown that a stable current attachment can be realized in the cavity without the aid of cathode heaters, keeper electrodes, or emissive coatings.
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-138622 , SAR-634U
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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