Spatial distribution of ion emission in gas-puff z-pinches and dense plasma foci

D. Klir, A. V. Shishlov, S. L. Jackson, V. A. Kokshenev, P. Kubes, K. Rezac, A. R. Beresnyak, R. K. Cherdizov, J. Cikhardt, B. Cikhardtova, G. N. Dudkin, J. T. Engelbrecht, F. I. Fursov, J. Kaufman, J. Krasa, J. Kravarik, N. E. Kurmaev, V. Munzar, N. A. Ratakhin, K. TurekV. A. Varlachev

Результат исследований: Материалы для журналаСтатья

1 Цитирования (Scopus)

Аннотация

Mega-ampere dense plasma foci and deuterium gas-puff z-pinches can accelerate deuterons to multi-MeV energies. Diagnostic measurements of the properties of these ions provide information about ion acceleration in z-pinch plasmas. In particular, the results from ion pinhole cameras seem to be useful for the discussion of ion acceleration mechanisms. Recently, we have used various configurations of ion pinhole cameras in deuterium gas-puff experiments on the GIT-12 generator at the Institute of High Current Electronics in Tomsk and on the HAWK generator at the US Naval Research Laboratory in Washington. The stack of radiochromic films and CR-39 solid-state nuclear track detectors recorded deuterons with energies up to 30 MeV. From our ion diagnostics, we obtained the spatial distribution of the ion source and the ion-beam divergence during the ion emission. This ion-beam divergence was found to decrease with increasing deuteron energy. At 20 MeV, the divergence of each of the individual micro-beams that composed the ion source was on the order of 10 mrad. The deflection of each micro-beam due to the azimuthal magnetic and/or radial electric fields resulted in radial stripes observed by the beam-profile detectors. By analyzing the ion pinhole images, we found that the deuterons were emitted both from a central spot and from a ring-shaped region with a rather large diameter, on the order of 1 cm. The origin and particular diameter of this ring is attributed to the geometry of the electrodes and to the distribution of the current density before the disruption.

Язык оригиналаАнглийский
Номер статьи035009
ЖурналPlasma Physics and Controlled Fusion
Том62
Номер выпуска3
DOI
СостояниеОпубликовано - 1 янв 2020

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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  • Цитировать

    Klir, D., Shishlov, A. V., Jackson, S. L., Kokshenev, V. A., Kubes, P., Rezac, K., Beresnyak, A. R., Cherdizov, R. K., Cikhardt, J., Cikhardtova, B., Dudkin, G. N., Engelbrecht, J. T., Fursov, F. I., Kaufman, J., Krasa, J., Kravarik, J., Kurmaev, N. E., Munzar, V., Ratakhin, N. A., ... Varlachev, V. A. (2020). Spatial distribution of ion emission in gas-puff z-pinches and dense plasma foci. Plasma Physics and Controlled Fusion, 62(3), [035009]. https://doi.org/10.1088/1361-6587/ab6902