Matter and Radiation at Extremes, Volume. 5, Issue 4, 046401(2020)
Scenario of a magnetic dynamo and magnetic reconnection in a plasma focus discharge
Fig. 1. Interferometric frames from shot 12 586. (a) and (b) During the implosion. (c) and (d) During the formation of the plasmoid. (e) and (f) During the stagnation phase. In (a), the internal toroidal structures are within the solid white ellipses. In (b), the external toroidal structures are within the solid black ellipses. In (c), the maximal axial current flow in the column occurs within the dashed black ellipse. In (d), the internal plasmoidal structure is within the white dashed ellipse. In (e), the phase of the pinch column with rare fringes in its interior is within the black dashed ellipse.
Fig. 2. Interferometric frames from shot 12 605 recorded at different phases: [(a) and (b)] During the pinch stagnation. [(c), (d), and (e)] During the evolution of the constrictions. [(e) and (f)] During the decay of the plasma column structures. In (b), the black ellipse marks the profile of the toroidal tube and the dashed black line is the cross section that was used to calculate the closed currents.
Fig. 3. XUV frames from shot 12 605 for the same discharge shown in the interferometric images in
Fig. 4. Computation results: (a) Radial distribution of the interferometric fringes along the line of the cross section marked in
Fig. 5. Waveforms from shot 12 605. Gray: The current derivative with a dip. Green: Voltage with a peak at the smallest pinch diameter. Yellow: SXR pulses emitted at the current derivative dip, at the voltage peaks, and at the formation of the first plasmoid. Red: HXR signal. Blue: Neutrons at 2.45 MeV shifted in time. The neutrons begin to be emitted during the disruption of the constriction [
Fig. 6. Neutron signals recorded at a distance of 7 m in the downstream (blue), side-on (green), and upstream (red) directions. The temporal shift of the peaks (
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P. Kubes, M. Paduch, M. J. Sadowski, J. Cikhardt, D. Klir, J. Kravarik, R. Kwiatkowski, V. Munzar, K. Rezac, A. Szymaszek, K. Tomaszewski, E. Zielinska, M. Akel, B. Cikhardtova. Scenario of a magnetic dynamo and magnetic reconnection in a plasma focus discharge[J]. Matter and Radiation at Extremes, 2020, 5(4): 046401
Category: Inertial Confinement Fusion Physics
Received: Oct. 24, 2019
Accepted: Jun. 22, 2020
Published Online: Nov. 25, 2020
The Author Email: Kubes P. (kubes@fel.cvut.cz)