DocumentCode :
2443249
Title :
New modes of X pinch backlighting on cobra
Author :
Blesener, Isaac C. ; Bell, Kate S. ; Chalenski, David A. ; Greenly, John B. ; Knapp, Patrick F. ; McBride, Ryan D. ; Schrafel, Peter C. ; Hammer, David A. ; Kusse, Bruce R.
Author_Institution :
Cornell Univ. Ithaca, Ithaca, NY
fYear :
2008
fDate :
15-19 June 2008
Firstpage :
1
Lastpage :
1
Abstract :
Summary form only given. X pinch backlighting is a useful imaging technique whereby two or more wires are crossed at a single point and driven with a high current (300-500 kA). At the crossing point, a micron-scale sub-nanosecond X-ray source is produced that acts as a point source and can be used for point-projection imaging. Three new modes of X pinch imaging on COBRA have been implemented. One of these techniques involves coupling the point-projection imaging with an MCP camera. This method is in development in the hopes that it can be used to take high resolution images of imploding (i.e. strongly radiating) wire-array Z pinches by time-gating out the radiation from the Z pinch. Previous attempts resulted in low contrast, blurry images. Presented here are new results which show an improvement in image quality. Another recent development involves a new large format imaging camera which allows point-projection imaging with high magnification. This new camera can be used to take backlighting images of wire arrays with ~34times magnification. Presented here are recent images of dense wire cores and coronal plasma, both showing significant axial modulation. Finally, for the first time on COBRA, a technique is in development for end-on X pinch backlighting. Preliminary results from this new method will be presented.
Keywords :
Z pinch; corona; plasma X-ray sources; COBRA; X pinch backlighting; coronal plasma; current 300 kA to 500 kA; large format imaging camera; micron-scale subnanosecond X-ray source; point-projection imaging; wire-array Z pinches; Cameras; High-resolution imaging; Image quality; Image resolution; Laboratories; Optical imaging; Plasma density; US Department of Energy; Wire; X-ray imaging;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science, 2008. ICOPS 2008. IEEE 35th International Conference on
Conference_Location :
Karlsruhe
ISSN :
0730-9244
Print_ISBN :
978-1-4244-1929-6
Electronic_ISBN :
0730-9244
Type :
conf
DOI :
10.1109/PLASMA.2008.4591100
Filename :
4591100
Link To Document :
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