Time-resolved measurement of neutron energy isotropy in a sheared-flow-stabilized Z pinch
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929454319665152 |
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| author | Ryan, R. A. Tsai, P. E. Johansen, A. R. Youmans, A. Higginson, D. P. Mitrani, J. M. Adams, C. S. Sutherland, D. A. Levitt, B. Shumlak, U. |
| author_facet | Ryan, R. A. Tsai, P. E. Johansen, A. R. Youmans, A. Higginson, D. P. Mitrani, J. M. Adams, C. S. Sutherland, D. A. Levitt, B. Shumlak, U. |
| contents | Previous measurements of neutron energy using fast plastic scintillators while operating the Fusion Z Pinch Experiment (FuZE) constrained the energy of any yield-producing deuteron beams to less than $4.65 keV$. FuZE has since been operated at increasingly higher input power, resulting in increased plasma current and larger fusion neutron yields. A detailed experimental study of the neutron energy isotropy in these regimes applies more stringent limits to possible contributions from beam-target fusion. The FuZE device operated at $-25~kV$ charge voltage has resulted in average plasma currents of $370~kA$ and D-D fusion neutron yields of $4\times10^7$ neutrons per discharge. Measurements of the neutron energy isotropy under these operating conditions demonstrates the energy of deuteron beams is less than $7.4 \pm 5.6^\mathrm{(stat)} \pm 3.7^\mathrm{(syst)}~keV$. Characterization of the detector response has reduced the number of free parameters in the fit of the neutron energy distribution, improving the confidence in the forward-fit method. Gamma backgrounds have been measured and the impact of these contributions on the isotropy results have been studied. Additionally, a time dependent measurement of the isotropy has been resolved for the first time, indicating increases to possible deuteron beam energies at late times. This suggests the possible growth of $m$=0 instabilities at the end of the main radiation event but confirms that the majority of the neutron production exhibits isotropy consistent with thermonuclear origin. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_05171 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Time-resolved measurement of neutron energy isotropy in a sheared-flow-stabilized Z pinch Ryan, R. A. Tsai, P. E. Johansen, A. R. Youmans, A. Higginson, D. P. Mitrani, J. M. Adams, C. S. Sutherland, D. A. Levitt, B. Shumlak, U. Plasma Physics Nuclear Experiment Previous measurements of neutron energy using fast plastic scintillators while operating the Fusion Z Pinch Experiment (FuZE) constrained the energy of any yield-producing deuteron beams to less than $4.65 keV$. FuZE has since been operated at increasingly higher input power, resulting in increased plasma current and larger fusion neutron yields. A detailed experimental study of the neutron energy isotropy in these regimes applies more stringent limits to possible contributions from beam-target fusion. The FuZE device operated at $-25~kV$ charge voltage has resulted in average plasma currents of $370~kA$ and D-D fusion neutron yields of $4\times10^7$ neutrons per discharge. Measurements of the neutron energy isotropy under these operating conditions demonstrates the energy of deuteron beams is less than $7.4 \pm 5.6^\mathrm{(stat)} \pm 3.7^\mathrm{(syst)}~keV$. Characterization of the detector response has reduced the number of free parameters in the fit of the neutron energy distribution, improving the confidence in the forward-fit method. Gamma backgrounds have been measured and the impact of these contributions on the isotropy results have been studied. Additionally, a time dependent measurement of the isotropy has been resolved for the first time, indicating increases to possible deuteron beam energies at late times. This suggests the possible growth of $m$=0 instabilities at the end of the main radiation event but confirms that the majority of the neutron production exhibits isotropy consistent with thermonuclear origin. |
| title | Time-resolved measurement of neutron energy isotropy in a sheared-flow-stabilized Z pinch |
| topic | Plasma Physics Nuclear Experiment |
| url | https://arxiv.org/abs/2408.05171 |