Comparison of optical spectra recorded during DPF-1000U plasma experiments with gas-puffing

• Authors: Dobromil R. Zaloga , Elzbieta Skladnik-Sadowska , Monika Kubkowska , Marina S. Ladygina , Karol Malinowski , Roch Kwiatkowski , Marek J. Sadowski , Marian Paduch , Ewa Zielinska , Vadym A. Makhlaj
• Languages of publication: EN

Abstracts

EN

The results are presented of the optical spectra measurements for free plasma streams generated with the use of the modified DPF-1000U machine. This facility was recently equipped with a gas injection system (the so-called gas-puff) placed on the symmetry axis behind the central opening in the inner electrode. The DPF-1000U experimental chamber was filled up with pure deuterium at the initial pressure of 1.6 or 2.4 mbar. Additionally, when the use was made of the gas-puff system about 1 cm3 of pure deuterium was injected at the pressure of 2 bars. The gas injection was initiated 1.5 or 2 ms before the triggering of the main discharge. The investigated plasma discharges were powered from a condenser bank charged initially to 23 kV (corresponding to the energy of 352 kJ), and the maximum discharge current amounted to about 1.8 MA. In order to investigate properties of a dense plasma column formed during DPF-1000U discharges the use was made of the optical emission spectroscopy. The optical spectra were recorded along the line of sight perpendicular to the vacuum chamber, using a Mechelle®900 spectrometer. The recent analysis of all the recorded spectra made it possible to compare the temporal changes in the electron density of a freely propagating plasma stream for discharges without and with the gas-puffing. Using this data an appropriate mode of operation of the DPF-1000U facility could be determined.

Keywords

EN

electron density; gas-puff; optical spectrum; plasma focus; plasma stream

• Publisher: De Gruyter Open
• Journal: Nukleonika
• Year: 2015
• Volume: 60
• Issue: 2
• Pages: 309-314

Dates

published

1 - 6 - 2015

received

12 - 6 - 2014

accepted

14 - 1 - 2015

online

22 - 6 - 2015

Contributors

author

Dobromil R. Zaloga

• National Centre for Nuclear Research (NCBJ), 7 Andrzeja Soltana Str., 05-400 Otwock/Swierk, Poland, Tel.: [phone], Fax: [phone]

author

Elzbieta Skladnik-Sadowska

• National Centre for Nuclear Research (NCBJ), 7 Andrzeja Soltana Str., 05-400 Otwock/Swierk, Poland, Tel.: [phone], Fax: [phone]

author

Monika Kubkowska

• Institute of Plasma Physics and Laser Microfusion (IPPLM), 23 Hery Str., 01-497 Warsaw, Poland

author

Marina S. Ladygina

• Institute of Plasma Physics, NSC KIPT, 61-108 Kharkov, Ukraine

author

Karol Malinowski

• National Centre for Nuclear Research (NCBJ), 7 Andrzeja Soltana Str., 05-400 Otwock/Swierk, Poland, Tel.: [phone], Fax: [phone]

author

Roch Kwiatkowski

• National Centre for Nuclear Research (NCBJ), 7 Andrzeja Soltana Str., 05-400 Otwock/Swierk, Poland, Tel.: [phone], Fax: [phone]

author

Marek J. Sadowski

• National Centre for Nuclear Research (NCBJ), 7 Andrzeja Soltana Str., 05-400 Otwock/Swierk, Poland and Institute of Plasma Physics and Laser Microfusion (IPPLM), 23 Hery Str., 01-497 Warsaw, Poland

author

Marian Paduch

• Institute of Plasma Physics and Laser Microfusion (IPPLM), 23 Hery Str., 01-497 Warsaw, Poland

author

Ewa Zielinska

• Institute of Plasma Physics and Laser Microfusion (IPPLM), 23 Hery Str., 01-497 Warsaw, Poland

author

Vadym A. Makhlaj

• Institute of Plasma Physics, NSC KIPT, 61-108 Kharkov, Ukraine

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Identifiers

DOI

10.1515/nuka-2015-0058