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Electromagnetic Propulsion
Brice CassentiUniversity of Connecticut
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Electromagentic Propulsion
• Electric Rocket Propulsion• Solar and Laser Sailing
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Electromagnetic Forces• Particle with – Charge– Mass– Velocity
• Electric Field Intensity• Magnetic Flux Density
• Equation of motion
q
E
B
mv
BvEqdtvdm
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Plasma Drift
B applied magnetic fieldE applied electric fieldj current due to Ev drift velocity
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Hall Effect in a Solid
http://arapaho.nsuok.edu/~bradfiel/advlab/Hall/hall-effect.pdf
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Current Flow in a Plasma
• In a neutral plasma– – ni , ne are the ion and electron number densities
• Current is
– is the conductivity
eeii vnvnqj
dtndj
dtjd
nqm
nqp
nqBjBvEj
e
e
e
e
e
ln
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Resistojet
Humble, et al
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Electron Bombardment Ion Thruster
Sutton
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Rail Acclerator
Sutton
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MPD Arcjet
Sutton
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Hall Accelerator
Sutton
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Solar and Laser Sails
• Momentum of light–
• Pressure due to reflection–
• Intensity of sun at earth– 1360 W/m2
cEP /
cIp /2
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Solar Sails
Google “Solar Sail images”
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Laser Sails
R.L. Forward
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Microwave Sail - Starwisp
R.L. Forward
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References• Davidson, R.C. and H. Qin, Physics of Intense Charged Particle Beams in High Energy
Physics, Imperial College Press, London and World Scientific Publishing Co., Pte. Ltd., Singapore, 2001.
• Davidson, R.C., Physics of Nonneutral Plasmas, Imperial College Press, London and World Scientific Publishing Co., Pte. Ltd., Singapore, 2001.
• Forward, R.L., Beamed Power Propulsion to the Stars, AAAS Symposium on Interstellar Communication and Travel, AAAS Annual Meeting, Philadelphia, 25-20 May 1986
• Hughes, W.F., and J.A. Brighton, Theory and Problems of Fluid Dynamics, Schaum’s Outline Series, McGraw-Hill Book Company, New York, 1967.
• Humble, R.W., G.N. Henry, and W.J. Larson, Space Propulsion Analysis and Design, The McGraw-Hill Publishing Companies, Inc., New York, 1995.
• Jeffrey, A., Magnetohydrodynamics, John Wiley & Sons, Inc., 1966.• Samaras, D.G., Theory of Ion Flow Dynamics, Dover Publishers, Inc., New York, 1962• Sutton, G. and O. Biblarz, Rocket Propulsion Elements, 7th edition, John Wiley &
Sons, Inc., New York, 2001.