MULTICHANNEL SOFT-X-RAY DIAGNOSTICS OF HOT PLASMA EVOLUTION IN NITROGEN-PUFF Z-PINCH

Soft X-ray emission from nitrogen plasma of a small gas-puff Z-pinch h as been studied. Multilayer mirror polychromator with time-resolved re gistration by PIN diodes was installed and its relatively narrow spect ral windows were aligned to the important parts of nitrogen spectrum b etween 390 and 710 eV. The electron temperature evolution (T(e) almost -equal-to 400 eV in hot spots) was measured from a slope of recombinat ion continuum of He-like nitrogen. The T(e) of bulk plasma (almost-equ al-to 100 eV) is compared with T(e) calculated from yields of K-shell lines. Moreover, pinhole cameras were used for better understanding th e radiation phase of the pinch. Time sequences of peaks in X-ray signa ls corresponding to a number of bright spots on photographs, are prese nted.