| Zdroj: |
Physics of Plasmas; Jul2008, Vol. 15 Issue 7, p072703, 8p, 1 Color Photograph, 5 Black and White Photographs, 1 Diagram, 3 Graphs |
| Abstrakt: |
X pinches formed from tungsten, molybdenum, titanium, aluminum, and alloys, such as constantan and nichrome with diameters of 13–25 μm, have been imploded with a 300 kA, 1 μs quarter-period capacitor discharge and observed with an array of diagnostics including time-integrated optical photography, x-ray pinhole cameras, x-ray Si photodiodes, a flat crystal spectrograph, and a Nd:YAG laser interferometry/schlieren system. The results of these comprehensive observations are presented. When a single, central hot spot is formed with the right choice of wire and x-ray filter, it is observed to be highly localized, very bright and small enough that point projection radiography can be routinely demonstrated for a simple biological specimen. For an aluminum X pinch, spectroscopic measurements indicate that the hot spots have a plasma density and electron temperature consistent with ∼1020 cm-3 and ∼320–350 eV, respectively. [ABSTRACT FROM AUTHOR] |
