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... the existence of negative masses hidden behind positive masses. But their use for propulsion by reducing the inertia of matter for example, in the limit of macroscopic bodied with zero rest mass, depends on a ... of a gravitational potential well, produced by a positive mass, is for negative masses the same as for positive masses, and large amounts of negative masses might have over billions of years been trapped in these ...

... ," "The Duoplasmatron: Theoretical Studies and Experimental Observations," "The Development of a Negative Ion Source," "The Oscillating-Electron Plasma Source," "Characteristics of Porous Surface Ionizers," ... Ion Beam Neutralization Studies," "Circular Beam Neutralization," "Neutralization of Ion Beams for Propulsion by Electron Trap Formation," "On Ion Rocket Neutralization," "Present Status of ...

... Volume 59 59 '''Page ''' - 306-312 '''Year''' - 2006 '''Keywords''' - Ceres, minor planets, micromission, solar electric propulsion, spacecraft design '''JBIS Reference Code ''' - 2006.59.306 '''Number of Pages''' - 7 Abstract The largest ... thrust-to-mass ratios are critical to the performance. Rather than increasing spacecraft size to devote a greater fraction to power and propulsion, an approach minimizing mass in "core" systems allows electric propulsion to ...

... for Volume 65 65 '''Page ''' - 232-243 '''Year''' - 2012 '''Keywords''' - Project Icarus, Fusion Propulsion '''JBIS Reference Code ''' - 2012.65.232 '''Number of Pages''' - 12 Abstract Project Icarus ... could be found. Figures of merit that were assessed include: current technological state, mass and volume estimates, possible gain values, main advantages and disadvantages of the concept ...

... propulsion system that mankind has is chemical propulsion. However, in momentum thrust propulsion the maximum speed is limited by the product of the effective gas exhaust velocity and the natural logarithm of the mass ratio; hence, the speed of present rockets is too slow compared with the speed of the planets and for interstellar travel. A breakthrough in propulsion science is required ...

... technology. Achievable propulsive power is a particularly limiting factor, since this determines the acceleration that may be obtained. Conventional chemical rocket engines have specific propulsive powers (power per unit engine mass) in the order of gigawatts per tonne. One cannot envisage the possibility of approaching such a level of performance by orders of magnitude in presently conceivable nuclear propulsive systems ...

... in swarms and reports the first results of a novel hybrid propulsion system recently developed for close- proximity motion. This hybrid propulsion system takes advantage of Coulomb spacecraft charging, saving on fuel consumed from the conventional electric/ion thrusters on-board the spacecraft. This would reduce the spacecraft mass, launch cost ...

... significant: (1) reduction in launch mass leading to more flexibility in operations and compatibility with smaller launchers; and (2) greater re- use of in-space propulsion and crew habitation systems. Independent cost analyses are presented and architectures with and without electric propulsion are compared in terms of average annual cost. Electric propulsion architectures can approach ...

... the British Interplanetary Society for Volume 60 60 '''Page ''' - 304-308 '''Year''' - 2007 '''Keywords''' - Propulsion system, plug nozzle, engine cluster, planetary, lunar, moon, lander, main and assist engine, ... concept. One of its major advantages is the scalability to different mission, spacecraft mass und thrust requirements. Once the clustered/plug nozzle concept is developed it can ...

... Society for Volume 60 60 '''Page ''' - 63-71 '''Year''' - 2007 '''Keywords''' - Small spacecraft, electric propulsion, electric propulsion missions, electric thrusters, solar cells, solar arrays, silicon carbide electronics, lithium-ion batteries, space computers ... vehicles with launch masses of less than 200 kg. Predominant amongst these technologies is power production, from much improved solar cells and solar arrays. This has allowed electric propulsion (EP) systems to ...

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