Technique for acceleration of projectiles to a velocity larger than the escape velocity of Earth 11.2 km/s

Physics

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5405 Atmospheres (0343, 1060), 5420 Impact Phenomena, Cratering (6022, 8136), 6022 Impact Phenomena (5420, 8136)

Scientific paper

We accelerate glass and aluminium spheres with a size of 0.1 - 0.4 mm to a velocity higher than 10 km/s using a high-power laser, GEKKO XII - HIPER at Institute of Laser Engineering, Osaka University. Using an x- ray backlight system, in which we observe the projectiles in a shadow of intense x-ray, we can estimate the velocity of projectiles by a streak camera. Also, using this system, their shape can be observed by a framing camera. The projectiles are finally collided to LiF targets. It is expected that LiF does not vaporize with an impact velocity lower than 10 km/s. We observe some lines of Li when a glass projectile collide LiF at ~ 20 km/s, using a time-resolved spectrometer after an estimated impact time. This is the first observation of the impact vaporization with a higher velocity than 10 km/s.

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