Advanced Electric Propulsion Research PDF Download
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Author: Colorado State University. College of Engineering
Publisher:
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Category :
Languages : en
Pages :
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Author: Colorado State University. College of Engineering
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: William R. Mickelsen
Publisher:
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Category : Electrostatic accelerators
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
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Author: William R. Mickelsen
Publisher:
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Category : Electrostatic accelerators
Languages : en
Pages :
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722920128
Category :
Languages : en
Pages : 108
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Book Description
Results are presented which show that hollow cathodes can be operated on ammonia but that sustained operation in the high pressures where arcjet thrusters operate (of the order of 1000 Torr) is difficult to achieve. The concept of using contoured, fine wire meshes attached across the screen grid apertures in an ion thruster to effect control of the ion beam divergence is introduced. The concept is compared to conventional (free sheath) ion extraction and is shown to be potentially attractive. The performance related effects of changing the anode and cathode locations and of interchanging hollow cathode and refractory filament electron sources within an 8-cm diameter, argon, ring cusp ion thruster discharge chamber are examined. The effects induced in discharge chamber performance by changes in magnetic field strength and configuration and in propellant flow distribution are also measured. Results are presented in terms of changes in the parameters that describe the effectiveness of primary electron utilization and ion extraction into the beam. The apparatus and instrumentation used to study hollow cathode operation at high electron emission levels (of the order of 100 A) is described. Wilbur, Paul J. Unspecified Center ARC JET ENGINES; ELECTROSTATIC ENGINES; ION PROPULSION; RESEARCH MANAGEMENT; AMMONIA; ARGON; FILAMENTS; HOLLOW CATHODES; ION BEAMS; MAGNETIC FIELDS; OPTICS; REFRACTORY MATERIALS...
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722158231
Category :
Languages : en
Pages : 66
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An experimental study of impingement current collection on the accelerator grid of an ion thruster is presented. The equipment, instruments, and procedures being used to conduct the study are discussed. The contribution to this current due to charge-exchange ions produced close to the grid is determined using a volume-integration procedure and measured ion beam current design, computed neutral atom density and measured beam plasma potential data. This current, which is expected to be almost equal to that measured directly, is found to be an order of magnitude less. The impingement current determined by integrating the current density of ambient ions in the beam plasma close to the grid is found to agree with the directly measured impingement current. Possible reasons for the disagreement between the directly measured and volume integrated impingement currents are discussed. Monheiser, Jeffery M. and Wilbur, Paul J. Unspecified Center...
Author:
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ISBN:
Category :
Languages : en
Pages : 56
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Author:
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ISBN:
Category :
Languages : en
Pages : 82
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Author:
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ISBN:
Category :
Languages : en
Pages : 68
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Book Description
Author: Martin Tajmar
Publisher: Springer Science & Business Media
ISBN: 3709105471
Category : Technology & Engineering
Languages : en
Pages : 139
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Book Description
Space propulsion systems have a great influence on our ability to travel to other planets or how cheap a satellite can provide TV programs. This book provides an up-to-date overview of all kinds of propulsion systems ranging from classical rocket technology, nuclear propulsion to electric propulsion systems, and further to micro-, propellantless and even breakthrough propulsion, which is a new program under development at NASA. The author shows the limitations of the present concepts and how they could look like in the future. Starting from historical developments, the reader is taken on a journey showing the amazing technology that has been put on hold for decades to be rediscovered in the near future for questions like how we can even reach other stars within a human lifetime. The author is actively involved in advanced propulsion research and contributes with his own experience to many of the presented topics. The book is written for anyone who is interested in how space travel can be revolutionized.
