Krypton spectroscopy diagnosis of high temperature implosions. Semiannual report

This report covers observation of K-shell krypton lines, determination of temperature by line-intensity ratio, mixing diagnosis based on high-opacity Kr lines, and a method for measuring the escape factor. High-temperature implosions are planned for the OMEGA Upgrade experimental program. By using relatively thin shell targets, temperatures >> 1 keV at modest compressed densities (1-5 g/cm{sup 3}) are predicted. Goal is to demonstrate that by adding a small admixture of Kr (0.01 atm) to the fuel, the temperature can be diagnosed through the spectrum of He-like (Kr{sup +34}) and H-like (Kr{sup 35+}) lines. By increasing the fill pressure, resonant Kr lines become opaque through self absorption and relative intensities can be used to diagnose shell-fuel mixing