RESEARCH DIRECTED TOWARD THE ATTAINMENT AND UTILIZATION OF HIGH TEMPERATURE (MULTI-FRAME HIGH SPEED CAMERA. EXPLODING WIRE PHENOMENA AND PLASMA ACCELERATION)

摘要

The three major topics discussed in this report are: (1) High speed camera, (2) Exploding wire phenomena, (3) Plasma acceleration experiments.nA rotating mirror camera was devised for the express purpose of photographing the initial phases in a wire explosion. The camera depends on a unique optical system for forming the images. This makes possible the use of relatively low rotational speeds for frame rates up to 2 x 10^ frames per second.nThe section of the report dealing with exploding wire phenomena has been written with the view of consolidating under one cover as many parameter dependent effects encountered in experiments as present equip-ment allows. The conclusions are substantiated by current and voltage oscillograms and, wherever possible, by high speed photographic techniques employing image converter and rotating mirror cameras.nIn the plasma acceleration experiments, the quantitative description is limited to giving orders of magnitude and general effects. The investigations are concerned with the directionality and velocity of the ionized particles. An exploding wire is the source of the plasma. Three methods have been used to study the plasma accelerations: (1) an image converter, (2) rotating mirror camera, and (S) biased gaps. An experimental curve gaveling average velocity of the plasma as a function of pressure is included.