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Proceedings Paper

Effect of air pressure on propulsion with TEA CO2 laser
Author(s): Andrew V. Pakhomov; Jun Lin; Kenneth A. Herren
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Paper Abstract

The assessment of energy partition between air and solid propellant has been conducted using a TEA CO2 laser. The experiments were performed by focusing output pulses of the laser (200 ns pulsewidth at 10.6 μm wavelength and ~10.6 J pulse energy) on aluminum targets mounted on a ballistic pendulum. Coupling coefficients and mass removal rates were determined as functions of air pressure, which varied from 1 atm to 3.5 mTorr. The data from both coupling coefficients and mass removal rates show that there is a sharp transition region ranging between 1.0 and 10 Torr. In this region the momentum imparted to the target via air breakdown appears comparable and, at higher pressures, dominating the momentum due to the breakdown on the target surface.

Paper Details

Date Published: 20 September 2004
PDF: 11 pages
Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.547135
Show Author Affiliations
Andrew V. Pakhomov, Univ. of Alabama in Huntsville (United States)
Jun Lin, Univ. of Alabama in Huntsville (United States)
Kenneth A. Herren, NASA Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 5448:
High-Power Laser Ablation V
Claude R. Phipps, Editor(s)

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