By a News Reporter-Staff News Editor at Defense & Aerospace Week -- Current study results on Propulsion and Power have been published. According to news reporting from Huntsville, Alabama, by VerticalNews journalists, research stated, "Experimental performance measurements are presented for an ablative gallium electromagnetic accelerator driven by a 50 its flat-top current pulse, with gallium supplied to the discharge by evaporation of the central cathode. The arc impedance, exhaust velocity, and electron temperature are measured for discharge currents in the range of ;6-24 kA and an electrode radius ratio of r(a)/rę = 3.4."
The news correspondents obtained a quote from the research from National Aeronautics and Space Administration, "The arc voltage is found to vary linearly with the discharge current, giving an arc impedance of 6-7 m Omega. An exhaust velocity of u(e) = 16 km/s is found by using the mass bit and computing the electromagnetic thrust from the discharge current data. This value is invariant with the discharge current and is within the experimental error of the velocities measured using electrostatic probes. Triple probe measurements yield on-axis electron temperatures in the range of 0.8-3.8 eV and electron densities in the range of 0.16-2.1 x 10(22) m(-3). Magnetic induction probe measurements in the interelectrode region yield a peak magnetic field of 0.8 Tat 24 kA and no evidence of the spoking instability."
According to the news reporters, the research concluded: "An efficiency of 25% at 1600 s is calculated for r(a)/rę = 3.4 using the mass bit and discharge current data assuming the cathode has a flat tip."
For more information on this research see: Performance Characteristics of an Ablative Gallium Electromagnetic Accelerator. Journal of Propulsion and Power, 2013;29(4):930-937. Journal of Propulsion and Power can be contacted at: Amer Inst Aeronautics Astronautics, 1801 Alexander Bell Drive, Ste 500, Reston, VA 22091-4344, USA.
Our news journalists report that additional information may be obtained by contacting R.E. Thomas, NASA, George C Marshall Space Flight Center, Huntsville, AL 35812, United States. Additional authors for this research include R.L. Burton and K.A. Polzin.
Keywords for this news article include: Alabama, Huntsville, United States, Propulsion and Power, North and Central America
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