Soft X-ray imaging is a very useful diagnostic technique in plasma-focus (PF) experiments. This
paper reports results of four experimental sessions which were carried out at the DPF-1000U plasma-focus
facility in 2013 and 2014. Over 200 discharges were performed at various experimental conditions. Measurements
were taken using two X-ray pinhole cameras with a line of sight perpendicular to the z-axis, at different
azimuthal angles (about 20° and 200°), and looking towards the centre of the PF-pinch column. They were
equipped with diaphragms 1000 μm or 200–300 μm in diameter and coated with filters of 500 μm Al foil and
10 μm Be foil, respectively. Data on the neutron emission were collected with silver activation counters. For
time-resolved measurements the use was made of four PIN diodes equipped with various fi lters and oriented
towards the centre of the PF-column, in the direction perpendicular to the electrode axis. The recorded X-ray
images revealed that when the additional gas-puff system is activated during the discharge, the stability of the
discharge is improved. The data collected in these experiments confi rmed the appearance of a filamentary fi ne
structure in the PF discharges. In the past years the formation of such fi laments was observed in many Z-pinch
type experiments. Some of the recorded X-ray images have also revealed the appearance of the so-called hot-
-spots, i.e. small plasma regions of a very intense X-ray emission. Such a phenomenon was observed before in
many PF experiments, e.g. in the MAJA-PF device, but it has not been investigated so far in a large facility such
as the DPF-1000U. The time-resolved measurements provided the evidence of a time lapse between the X-ray
emission from plasma regions located at different distance from the anode surface. The formation of distinct
‘hot-spots’ in different instants of the DPF-1000U discharge was also observed.
Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies
Informacja
SZANOWNI CZYTELNICY!
UPRZEJMIE INFORMUJEMY, ŻE BIBLIOTEKA FUNKCJONUJE W NASTĘPUJĄCYCH GODZINACH:
Wypożyczalnia i Czytelnia Główna: poniedziałek – piątek od 9.00 do 19.00