Soft X-Ray Spectra from High Current Nitrogen Z-Pinch Discharge

0463689 - ÚFP 2017 CZ eng J - Článek v odborném periodiku
Vrba, Pavel - Vrbová, M. - Nevrkla, M. - Jančárek, A.
Soft X-Ray Spectra from High Current Nitrogen Z-Pinch Discharge.
Plasma Physics and Technology. Roč. 3, č. 1 (2016), s. 48. ISSN 2336-2626.
[SPPT 2016 - 27th Symposium on Plasma Physics and Technology/27./. Prague, 20.06.2016-23.06.2016]
Institucionální podpora: RVO:61389021
Klíčová slova: Capillary discharge * recombination pumping * pinch dynamics * evolution of spectra emission * computer modelling
Kód oboru RIV: BH - Optika, masery a lasery
www.plasmaconference.cz

High current capillary pinching discharge was studied as a method for recombination pumping of Balmer α radiation. The critical parameter for 3-body collisional pumping process, in non-stationary under-colled plasma, is quick electron cooling during the pinch expansion phase. The ablation of capillary wall material strongly influences pinch dynamics. So, we have performed computer modelling of ablation based on MHD NPINCH and FLYCHK codes. The results of modelling, namely time evolution of spectra emission in the wavelength range 8-14 nm, were compared with gated spectra measured by CTU capillary device. The used alumina capillary with inner diam. 5 mm and length 22 cm was filled by nitrogen gas with density 5.8x10-6g.cm-3. Current passing thro ugh the capillary has the peak value 70 kA and FWHM ~ 60 ns. Plasma created from the ablated material leads to the reduction of nitrogen plasma heating and decreases the rate of pinch expansion
Trvalý link: http://hdl.handle.net/11104/0262800