Abstract
Projectile launch experiments were conducted using a new laser-driven, in-tube accelerator (LITA) in which the propellant was supplied not as pre-filled gas but from laser ablation. The launch tube had an inner diameter of 25 mm and was 1 m in length, made of acrylic. The 7.1-gram projectile had a parabolic nozzle and an ablator rod made of polyacetal that was located at the focus of the parabola. Laser pulses of 3.1 J to 3.8 were repetitively sent at a frequency of 50 Hz from a Transversely-Excited Atmospheric (TEA) CO2 laser (wavelength; 10.6 μm). Time-modulating the laser-ablative pressure, a large impulse performance was obtained with a moderate acceleration level. A momentum coupling coefficient of 1.5 mNs/J and a gross acceleration of 2.5g were obtained.
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