Enabling Next Generation Sodium-Based Batteries with Engineered NaSICON Ion Conductors.
Abstract not provided.
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Abstract not provided.
Sputtering yields of aluminum, copper and titanium measured as function of cesium ion energies for use as electrodes on cesium ion engines
Computer simulation technique to investigate the problem of getting electrons to emerge from an ion engine at the same rate and velocity as the ions
Computer simulation technique to investigate the problem of getting electrons to emerge from an ion engine at the same rate and velocity as the ions
Radio frequency noise generation from ion engine exhausts, noting electron cyclotron radiation from penning discharge engine
Flow through porous media and its implications for ion engine operation
The historical background and characteristics of the experimental flights of ion propulsion systems and the major ground-based technology demonstrations are reviewed. The results of the first successful ion engine flight in 1964, Space Electric Rocket Test (SERT) I, which demonstrated ion beam neutralization, are discussed along with the extended operation of SERT II starting in 1970. These results together with the technologies employed on the early cesium engine flights, the applications technology satellite series, and the ground-test demonstrations, have provided the evolutionary path for the development of xenon ion thruster component technologies, control systems, and power circuit implementations. In the 1997-1999 period, the communication satellite flights using ion engine systems and the Deep Space 1 flight confirmed that these auxiliary and primary propulsion systems have advanced to a high level of flight readiness.
Circuitry for power conditioning and control system of cesium bombardment ion engine
Studies were conducted to both identify the environment produced by ion thrusters and to assess the interaction of this environment on a typical spacecraft and typical science instruments. Spacecraft charging and the charge exchange that accompanies it is discussed in detail. Electromagnetic interference was characterized for ion engines. The electromagnetic compatibility of ion thrusters with spacecraft instruments was determined. The effects of ion thruster plumes on spacecraft were studied with particular emphasis on external surface currents.
Electrostatic propulsion requirements and ion engine testing methods
An electric propulsion thrust system has the capability of providing a high specific impulse for long duration scientific missions in space. The EMI from the elements of an ion engine was characterized. The compatibility of ion drive electric propulsion systems with typical interplanetary spacecraft engineering was predicted.
A research program is underway to establish the feasibility of fabricating 15 cm diameter ion engine optics from polycrystalline diamond film. Because of its high thermal conductivity, low CTE, and low sputter yield, diamond film has the potential of mitigating life limiting and performance degrading processes which have hindered flight qualification of ion thrusters to date. Results of experiments are reported.
Surface ionization studies on refractory metals and metal alloys used in long term contact ion engine operation
Radio frequency noise radiation propagation from electrostatic cesium ion engine
Signal attenuation, signal distortion, and radio noise generation due to ion engine exhaust beam
Velocity distribution of propellant ejection and effect on propulsion efficiency of ion engines
Ion engine satellite control system noting design and laboratory tests
Design of high frequency dc-dc converter modules for power conditioning subsystems, and control system for operating ion engines in space environment