Tubes of aluminum and copper filled with C-4 high-explosive were tested during this study of the effects of explosive flaws and voids, their sizes and locations, and of the effects of armature machining tolerances on the expansion characteristics of armatures within helical flux-compression generators.Flaws and voids were introduced into the explosive fill of 6061-T6 aluminum armatures during assembly. The defects were located along the major axis of the fill, midway between the major axis and the explosive/armature interface, and at the interface. The resulting effects on armature expansion were recorded by high-speed framing camera, intensified charge-coupled display (ICCD) photography and by flash x-ray.Outer and inner surface defects were introduced into OFHC copper and 6061-T6 aluminum armatures via machining. The resulting effects during armature expansion were recorded by framing camera and by ICCD.

An integral part of the Explosive-Driven Power Generation Program is to enhance the quality and resolution of photography of the surface of EDPG armatures during explosive expansion. The quality and resolution of photography are affected by the amount of illumination, its wavelength, pulse duration, shock effects from the explosive event, explosive plasmas, and surrounding atmospheric characteristics (shock generation of light, blurring, refraction, etc.). Current methods of providing illumination for very high speed photography (/spl sim/1/spl times/10/sup 6/ frames per second) involve the utilization of intense light generated by explosive events such as so-called "argon bombs"; however, such devices reduce the maximum explosive weight in the experimental device and also generate light of a less desirable wavelength. A new system was developed in-house using inexpensive equipment that allows flash photography at 1/spl times/10/sup 6/ frames per second utilizing 100 ISO film. This equipment is described along with the techniques used to mitigate the deleterious effects of the explosive event on its surrounding environment. The resultant imaging maximizes resolution of phenomena at the armature surface, far surpassing any previously achieved at this facility.