Plasma Polarization Spectroscopy 4.Polarization Spectroscopy on Laser-Produced Plasmas and Z-Pinch Plasmas

PPS experiments on laser-produced plasmas are reviewed. Polarization is interpreted in terms of the an isotropic velocity distribution of electrons due to non-local transport. The polarization of an x-ray laser, and recent results regarding the recombining plasma are also presented. X-ray polarization spectroscopy experiments on heliumlike ion lines from a vacuum spark and from a plasma focus are presented: in both cases, the resonance line of the heliumlike ions shows polarization in the direction perpendicular to the discharge axis. Two possible interpretations are suggested.