Abstract
A gas gun for impact studies is described. The main parameters are 75.4 mm inside diameter and 13 m length. The 20-1 diaphragm breech is designed for a 40 MPa working pressure. The impact chamber is a cylinder, 62 cm in diameter and 51.5 cm in height, with a window to obtain photographic records. A 3 m 3 recuperation tank, pressure sealed to recover the helium, encloses the stopping mechanism. A building (20m×5m) was constructed so that the impact chamber and recuperation tank are inside a concrete room. The barrel and breech recoil freely, except for a couple of shock absorbers. The gun accelerates 1 kg projectiles to 1 km/s when filled with helium at design pressure. The main experimental interests are: (a) on controlled initial temperature targets, to test the previous theoretical work on the equation of state; (b) shock-induced polarization; and (c) the shock-induced phase transition of germanium.
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