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Schematic of the crush gun firing chamber. (A) Projectile body; (B) stop pad; (C) 1.6 mm thick rubber pad, laser cut, to help arrest the projectile gently; (D) projectile impactor; (E) the explosive pellet shown is 4 mm in diameter and 2 mm in height; (F) sapphire window for high-speed imaging (and strength); (G) turning mirror for high-speed imaging; and (H) vacuum chamber.
