Academic Journal
Spot size measurement of a deuterium–tritium dense plasma focus using neutron radiography.
| العنوان: | Spot size measurement of a deuterium–tritium dense plasma focus using neutron radiography. |
|---|---|
| المؤلفون: | Tafoya, L., Geppert-Kleinrath, V., Allison, J., Baker, S., Bundgaard, J., Freeman, M., Hayes-Sterbenz, A., Jungman, G., Li, H., Li, S., Lowe, D., Tybo, J., Wilde, C. |
| المصدر: | Review of Scientific Instruments; May2024, Vol. 95 Issue 5, p1-10, 10p |
| مصطلحات موضوعية: | NEUTRON radiography, PLASMA focus, DENSE plasmas, TRITIUM, IMAGING systems, RADIOGRAPHIC magnification |
| مصطلحات جغرافية: | NEVADA |
| مستخلص: | Neutron radiography is a technique uniquely suited to applications in nuclear diagnostics, non-destructive testing, and subcritical experiments. The spatial resolution of neutron radiographs is degraded by optical blur in the imaging system and the neutron source size, where the ideal source is point-like to optimize the point-spread function. A potential neutron source for radiography is the dense plasma focus (DPF), a coaxial Z-pinch that produces thermonuclear and beam-target neutrons. To assess if the source size is suitable for radiography, a neutron imaging system was used to measure the source size of the 4 MA Sodium DPF at the Nevada National Security Site operating with deuterium–tritium gas-fill. The source size was measured using the edge-spread function of tungsten objects, each having a rolled (convex) edge. The spot size was found to be 7–12 mm full-width at half-max (FWHM) assuming a Gaussian source, though comparison is presented for Lorentzian and Bennett distributions. The average FWHM was found to be 8.6 ± 1.2 mm vertically and 10.8 ± 1.2 mm horizontally with respect to the image plane, averaging over varied edges and alignments. The results were sensitive to source alignment and edge metrology, which introduced notable uncertainties. These results are consistent with separate experimental measurements as well as magnetohydrodynamics simulations of this DPF, which suggest that neutron production can originate from pinches ∼5–7 mm off-axis. These results suggest that the DPF should be used for radiography at low magnification (M < 1) where spot size does not dominate spatial blur. [ABSTRACT FROM AUTHOR] |
| Copyright of Review of Scientific Instruments is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| قاعدة البيانات: | Complementary Index |
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