Title :
Optical observation of localized plasma after pulsed discharges in liquid helium
Author :
Kojima, C. ; Minami, Kazuyuki ; Komatsu, Satoshi ; Shundo, M. ; Ishihara, O.
Author_Institution :
Graduate Sch. of Sci. & Technol., Niigata Univ., Japan
Abstract :
Summary form only given, as follows. Transient localized high-density plasma, in liquid helium (LHe) has been studied. Stark broadening of a He spectral line reveals the spatial and temporal evolution in the decaying plasma with density above 10/sup 16/ cm/sup -3/ produced by pulsed discharge between a pair of W needle electrodes in gaseous bubble surrounded by LHe. When one of the electrodes is replaced by Mg rod, strong spectral lines of Mg atoms are observed. Measurements axe made for two cases that the common axis of the electrodes is horizontal and vertical. In these cases, the density distribution in the directions, respectively, along and across the common axis can be measured.
Keywords :
Stark effect; discharges (electric); liquid helium; plasma density; plasma diagnostics; plasma production; spectral line broadening; He; Stark broadening; continuum lights; decaying plasma; density distribution; liquid helium; localized plasma; low-density plasma layer; pulsed discharges; spatial evolution; temporal evolution; time-resolved spectral line profiles; transient high-density plasma; Electrodes; Helium; Nuclear and plasma sciences; Optical pulses; Plasma density; Plasma measurements; Plasma simulation; Plasma sources; Plasma waves; Resonance;
Conference_Titel :
Plasma Science, 2003. ICOPS 2003. IEEE Conference Record - Abstracts. The 30th International Conference on
Conference_Location :
Jeju, South Korea
Print_ISBN :
0-7803-7911-X
DOI :
10.1109/PLASMA.2003.1228944
