DocumentCode :
2427984
Title :
Current-sheet velocity oscillation and radiation emission in plasma focus discharges
Author :
Melzacki, K. ; Nardi, V.
Author_Institution :
Stevens Inst. of Technol., Hoboken, NJ, USA
fYear :
1995
fDate :
5-8 June 1995
Firstpage :
283
Abstract :
Summary form only given, as follows. A phenomenon of current sheet velocity oscillation during the compression phase in plasma focus discharge has been found with a schlieren photography technique. The oscillation period has been determined as about 17 ns and coincided with the period of the simultaneously measured time derivative of the current. The same velocity behavior has been observed with magnetic probes. A microwave emission burst (in 3 cm and 10 cm bands) consisting of a sequence of very narrow (FWHM<1 ns) peaks, 17 ns apart one another, has also been observed before, during, and after the pinch. The microwave was polarized with the electric field parallel to the electrode axis. All these effects have been recorded on the same PF device (6 kJ). The origin of these oscillations can be interpreted in a few ways, e.g. as related to the electrode-plasma sheath RLC circuit, or to the j/sub s//spl times/B of the plasma current sheet, where j/sub s/ is the current density component perpendicular to the current sheet surface. The j/sub s/ is related to the current sheet velocity. These results provide the basis of our analysis.
Keywords :
discharges (electric); photography; pinch effect; plasma diagnostics; plasma focus; plasma oscillations; plasma probes; plasma sheaths; schlieren systems; compression phase; current density component; current sheet velocity; current-sheet velocity oscillation; electric field; electrode-plasma sheath RLC circuit; magnetic probes; microwave emission burst; microwave polarization; pinch; plasma current sheet; plasma focus discharges; radiation emission; schlieren photography; time derivative; velocity behavior; Current measurement; Electrodes; Microwave devices; Perpendicular magnetic recording; Photography; Plasma measurements; Polarization; Probes; RLC circuits; Time measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science, 1995. IEEE Conference Record - Abstracts., 1995 IEEE International Conference on
Conference_Location :
Madison, WI, USA
ISSN :
0730-9244
Print_ISBN :
0-7803-2669-5
Type :
conf
DOI :
10.1109/PLASMA.1995.533529
Filename :
533529
Link To Document :
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