A numerical study on the pulse duration dependence of a magnetic field generated using a laser-driven capacitor-coil target

• Published in: High energy density physics Vol. 36; p. 100818
• Main Authors: Sasaki, Toru, Takahashi, Kazumasa, Kikuchi, Takashi, Sunahara, Atsushi, Nagatomo, Hideo, Fujioka, Shinsuke
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2020
• Subjects: Capacitor-coil target; Intense laser; MHD simulation; MHD simulation; Capacitor-coil target; Intense laser
• ISSN: 1574-1818; 1878-0563
• DOI: 10.1016/j.hedp.2020.100818

•A two-dimensional magnetohydrodynamic (MHD) simulation to understand the MHD and the generated magnetic field (B-field) behaviors of a capacitor-coil target.•The results showed that a peak B-field strength was generated in the capacitor-coil target, followed by a current peak.•The time difference between the peak current and the generated B-field was up to 2 ns. In addition, the time difference of the capacitor-coil target corresponded to the inductance and resistance of the capacitor-coil target. These results suggested that a longer laser pulse was required to improve the B-field generated by the capacitor-coil target. Herein, a two-dimensional magnetohydrodynamic (MHD) simulation has been performed to understand the MHD and the generated magnetic field (B-field) behaviors of a capacitor-coil target. The results showed that a peak B-field strength was generated in the capacitor-coil target, followed by a current peak. This B-field depends on a peak current with a pulse duration of 2 ns. For a peak current of 2 ns, the average B-field in the capacitor-coil target is estimated by the center of the B-field from the conventional circular current. The time difference between the peak current and the generated B-field is up to 2 ns. Furthermore, the time difference of the capacitor-coil target corresponds to the inductance and resistance of the capacitor-coil target. Overall, the results suggests that a longer laser pulse will improve the strength of B-field generated by the capacitor-coil target.