DEVELOPMENT OF A VISIBLE FRAMING CAMERA DIAGNOSTIC FOR THE STUDY OF CURRENT INITIATION IN Z-PINCH PLASMAS

We assembled and tested a visible framing camera system to take 5 ns F WHM images of the early time emission from a z-pinch plasma. This diag nostic was used in conjunction with a visible streak camera allowing e arly time emissions measurements to diagnose current initiation. Indiv idual frames from gated image intensifiers were proximity coupled to c harge injection device cameras and read out at video rate and 8-bit re solution. A mirror was used to view the pinch from a 90 degrees angle. We observed the destruction of the minor surface, due to the high sur face heating, and the subsequent reduction in signal reflected from th e mirror. Images were obtained that showed early time ejecta and a non -uniform emission from the target. This initial test of the equipment highlighted problems with this measurement. We observed nonuniformitie s in early time emission. This is believed to be due to either spatial ly varying current density or heating of the foam. Images were obtaine d that showed early time ejecta from the target. The results and sugge stions for improvement are discussed in the text. (C) 1997 American In stitute of Physics.