Deuterium Gas-Puff Z-Pinch on GIT-12 Generator*

Deuterium gas-puff experiments have been carried out on the GIT-12 generator at the High Current Electronics Institute in Tomsk. During the initial experiment in May 2011, we used mainly double shell gas puffs with the outer and inner diameter of 100 and 30~mm, respectively. Single shell and shell-on-solid fill gas puffs were, however, also tested. The linear mass density of deuterium varied between 50 and 80 $\mu$g/cm. When a plasma-opening-switch (POS) was used, the current reached the peak of above 2.5~MA within 300~ns. The peak neutron yield from D(d,n)$^{3}$He reactions exceeded 10$^{11}$. In all shots, the neutron emission started during the stagnation. At the beginning of the neutron production, there was the correlation between the neutron emission and soft X-rays. Nevertheless, the peak of the neutron emission occurred 50~ns after the soft X-ray peak. At this very moment, hard X-rays above 1~MeV were detected. In the case of POS, $>800$~keV widths of side-on neutron spectra implied $>200$~keV deuterons moving in the radial direction.