Polarization of X-radiation of high-current Z-pinch

The results of the investigations into polarization of line radiation of multiple charged ion plasma of high-current Z-pinches are presented in the work. The experiments were performed on the ≪Angara-5-1≫ facility at Z-pinch currents of 2.5 to 3.5 MA. A dense high temperature pinch was produced by compresson of a hollow Ar gas jet injected by an electromagnetic valve with a supersonic nozzle. In the process of pinch compression the following plasma parameters have been achieved: electron density n_e~10²¹ cm^-3 and electron temperature Te~1 keV. The radiation spectrum was measured by use of a crystal spectrograph where mica (2d=19.8 A) served as a dispersive element. The spectrum of He-like ion of Ar was detected in reflection orders II and III. On the basis of the measurements performed the conclusions on the polarization degree of plasma radiation have been drawn. The work has been supported by Grant RFBR # 02-02-16832.