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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Douglass, J.D. Pikuz, S.A. Shelkovenko, T.A. Bell, K.S. Knapp, P.F. McBride, R.D. Hammer, D.A. |
| Copyright Year | 2007 |
| Description | Author affiliation: Cornell Univ. Ithaca, Ithaca (Douglass, J.D.; Pikuz, S.A.; Shelkovenko, T.A.; Bell, K.S.; Knapp, P.F.; McBride, R.D.; Hammer, D.A.) |
| Abstract | Summary form only given. X-pinch radiography has been used routinely at Cornell for more than 10 years to produce high quality X-ray images with excellent spatial and temporal resolution. This imaging technique is presently being used on the COBRA accelerator at Cornell University to study the ablation stage of wire-array z-pinches. Two of four return-current posts in the wire-array load region are replaced by Mo x-pinches. They are approximately 43 mm from the axis of the z-pinch. The experimental arrangement used here is very similar to the set-up that has been used at the Angara-5-1 facility near Moscow and also on MAGPIK at Imperial College in London. Typically, two x-pinches are used to image one wire in an eight-wire z-pinch from different angles. Images are obtained using Kodak EBioMAX MS and Technical Pan film. These films are typically placed 375 mm from the z-pinch axis yielding a magnification of about 9:1. The resulting X-ray images have sub-nanosecond temporal resolution because of the extremely short x pinch X-ray pulse duration and about 4 mum spatial resolution. Titanium filters are used to shield the films from visible light and transmit radiation in the spectral range 3-5 keV. Strong collimation is used to prevent radiation from the wire array z-pinch from exposing the films. Tungsten step wedges (step attenuators), which have steps ranging from 0.015-1.10 mum thick, placed on the Ti filters enable us to make density measurements of the ablation plasmas near the dense wire-cores. These density measurements are the main focus of this presentation. |
| Starting Page | 589 |
| Ending Page | 589 |
| File Size | 47150 |
| Page Count | 1 |
| File Format | |
| ISBN | 9781424409150 |
| ISSN | 07309244 |
| DOI | 10.1109/PPPS.2007.4345895 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2007-06-17 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Density measurement Plasma density Plasma measurements Tungsten Wire X-ray imaging Spatial resolution Plasma accelerators Image resolution Filters |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering |
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