A Far Field Repetitive Pulse Laser Thruster
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Studies of a Repetitively-Pulsed Laser Powered Thruster
| Author | : David I. Rosen |
| Publisher | : |
| Total Pages | : 94 |
| Release | : 1982 |
| Genre | : |
| ISBN | : |
In this report we present results of continuing analytical and experimental investigations carried out to evaluate the concept of pulsed laser propulsion. This advanced propulsion scheme, which has been the subject of several previous studies, involves supplying propellant energy by beaming short, repetitive laser pulses to a thruster from a remote laser power station. The concept offers the advantages of a remote power source, high specific impulse, high payload to total mass ratio (a consequence of the first two features) and moderate to high thrust (limited primarily by the average laser power available). The present research addresses questions related to thruster performance and optical design. In the thruster scheme under consideration, parabolic nozzle walls focus the incoming laser beam to yield breakdown in a propellant at the focal point of the parabola. The resulting high pressure plasma is characteristic of a detonation wave initiation by high power laser-induced breakdown. With a short laser pulse, the detonation wave quickly becomes a blast wave which propagates to the nozzle exit plane converting the high pressure of the gas behind it to a force on the nozzle wall. Propellant is fed to the focal region from a plenum chamber. The laser-induced blast wave stops the propellant flow through the throat until the pressure at the throat decays to the sonic pressure; then the propellant flow restarts. The process is repeated with each successive laser pulse.
Beamed Energy Propulsion
| Author | : Andrew V. Pakhomov |
| Publisher | : American Institute of Physics |
| Total Pages | : 750 |
| Release | : 2003-05-22 |
| Genre | : Science |
| ISBN | : |
Papers presented at the First International Symposium on Beamed Energy Propulsion, as the first conference of this kind, demonstrated that beamed energy propulsion is an established worldwide field of research and engineering, and an extremely active field of new technology. Four countries have already launched their lightcrafts, and the day when they will reach space is looming in the near future. A major demonstration of microwave propulsion in space will be conducted this year. Laser-based microthrusters are becoming off-the-shelf technology. Microairplanes and dirigibles are now riding on laser beams. Even planetary defense systems left sci-fi thrillers to become a matter of feasibility discussion. Topics include: Fluid Dynamics in Laser Propulsion; Ablative Laser Propulsion and Microthrusters; Microwave Propulsion; Microwave Sails; Beamed Energy for Interstellar Missions; Hybrid Systems and New Concepts; Miscellaneous Applications; Beam-Propelled Microaircraft; Beam Generation, Propagation, and Reception; Beamed Energy Propulsion; System Analysis; and High-Power BEP User Testing Facilities.
Beamed Energy Propulsion
| Author | : Kimiya Komurasaki |
| Publisher | : American Institute of Physics |
| Total Pages | : 586 |
| Release | : 2004-04-02 |
| Genre | : Science |
| ISBN | : 9780735401754 |
Papers presented at the Second International Symposium on Beamed Energy Propulsion demonstrated that this field is getting more active and has advanced considerably since last year. Japan demonstrated a microwave rocket using a 1MW gyrotron and China produced a laser launcher. Topics include: fluid dynamics in laser propulsion; ablative laser propulsion; microwave propulsion; mission proposal and analysis; hybrid systems and new concepts; beam transmission and reception; beam generation.
Quasi-steady Operation of Repetitively-pulsed Laser Thruster
| Author | : Takashi Abe |
| Publisher | : |
| Total Pages | : 22 |
| Release | : 1989 |
| Genre | : Lasers in aeronautics |
| ISBN | : |
An experimental study of quasi-steady operation of repetitively-pulsed laser thruster was conducted by using Kr-F laser of 100 pps (pulse per second). The measured impulse coupling coefficient is comparable to the result previously reported and the theoretical value predicted by the transparent vapor model. The thrust level in a quasi-steady operation can be estimated as the impulse coupling coefficient multiplied by the average power of the laser beam, since the time in which the recoil momentum is delivered by each shot of laser beam is satisfactorily smaller than the laser pulse interval. The specific impulse is also measured. It is larger than the theoretical value predicted from the transparent vapor model. During a few thousand shots of laser, there was not much reduction in the impulse coupling coefficient at the present laser power of a few watts. The new configuration in which the thrust vector is anti-parallel to the laser beam is proposed and is demonstrated.
Laser Propulsion in Space
| Author | : Claude Phipps |
| Publisher | : Elsevier |
| Total Pages | : 416 |
| Release | : 2024-06-10 |
| Genre | : Technology & Engineering |
| ISBN | : 0443159025 |
Space launches have evoked the same vivid image for decades: bright orange flames exploding beneath a rocket as it lifts off and thunders into the sky. An alternative acceleration system could reshape that vision forever, with rockets leaving their energy source on the ground... or in space. Laser Propulsion in Space: Fundamentals, Technology, and Future Missions takes readers on a comprehensive journey from the theoretical overview of propulsion fundamentals, to reviews of current projects involving high-power CW fiber lasers and energetic mm-wave sources with their ongoing and potential end-use applications in beamed energy propulsion (BEP). Written by experts in the field, this mathematically sound reference text also highlights graphical solutions of equations’ results, as well as case studies with worked-out examples, making this book an invaluable compendium for students, researchers, technology developers and futurists in understanding the promise and challenges of this emerging technology. Covers beamed energy propulsion advances Highlights state-of-the-art BEP applications of LEO debris removal, suborbital and orbital launch, solar system exploration, and interstellar lightsail probes, as well as advances in related photon source technologies and infrastructures Includes opinion sections explaining why we as a technical society should care about each chapter’s topic and the considerably good outcomes that can be achieved with laser engines Is accompanied by a website with video clips and other ancillary materials to enhance insight
EOS Reference Handbook
| Author | : |
| Publisher | : |
| Total Pages | : 152 |
| Release | : 1991 |
| Genre | : Artificial satellites in earth sciences |
| ISBN | : |
Investigation of Laser Propulsion
| Author | : P. K. Chapman |
| Publisher | : |
| Total Pages | : 264 |
| Release | : 1977 |
| Genre | : |
| ISBN | : |
The use of large ground based lasers to radiate power into a rocket engine allows arbitrary choice of propellant and specific impulse. The case of launch of one ton payload from near ground to geosynchronous transfer ellipse appears to be feasible using stacked carbon dioxide repetitive pulse lasers. Atmospheric propagation is enhanced by bleaching out CO2 absorption and using phase correction of the thermal blooming generated we expect that 1 microradian beam spreading can be achieved. The use of pulsed lasers permits an engine based on the laser detonation wave, in which laser energy is efficiently absorbed by inverse Bremsstrhlung in the propellant, which then expands out of the engine and provides thrust. Continuous use costs in the order of $20/lb to GEO are anticipated. (Author).
