Measurements on Laser Produced Plasma Using Faraday-Cups.

摘要

Experiments were performed on laser produced plasma from Lexan targets in a vacuum chamber at pressures of a few times .00001 Torr. Plasma diagnostics was performed using Faraday-cups biased at -50 volts to + 105 volts DC. In analyzing 460 oscilloscope trace pictures of Faraday-cup signals, the plasma expansion velocities measured was determined to be 12.5 million cm/sec. At a distance of 10 cm from the laser target impact point, the plasma electron temperature was determined from Faraday cup measurement to be about 2.4 ev. The plasma density was approximately 10 to the 13th power/cc.