Browsing by Author "Vestgården, Jørn Inge"

Now showing items 1-6 of 6

    • Cascade dynamics of thermomagnetic avalanches in superconducting films with holes 

      Vestgården, Jørn Inge; Colauto, Fabiano; de Andrade, AMH; Oliveira, AAM; Ortiz, W. A.; Johansen, Tom Henning (2015)
      The submicrosecond dynamics of thermomagnetic avalanches in superconducting films with nonconducting holes (antidots) is considered. When such an avalanche reaches a hole, it is quickly filled with magnetic flux, and often ...

    • Dendritic flux avalanches in a superconducting MgB2 tape 

      Qureishy, Thomas; Laliena, Carlos; Martínez, Elena; Qviller, Atle Jorstad; Vestgården, Jørn Inge; Johansen, Tom Henning; Navarro, Rafael; Mikheenko, Pavlo (2017)
      Tapes of MgB2 with high critical current have a significant technological potential, but can experience operational breakdown due to thermomagnetic instabilities. Such events are routinely registered by magnetisation ...

    • Nucleation and propagation of thermomagnetic avalanches in thin-film superconductors (Review Article) 

      Vestgården, Jørn Inge; Johansen, Tom Henning; Galperin, Yuri (2018)
      Stability of the vortex matter—magnetic flux lines penetrating into the material—in type-II superconductor films is crucially important for their application. If some vortices get detached from pinning centres, the energy ...

    • Oscillatory regimes of the thermomagnetic instability in superconducting films 

      Vestgården, Jørn Inge; Galperin, Yuri; Johansen, Tom Henning (2016)
      The stability of superconducting films with respect to oscillatory precursor modes for thermomagnetic avalanches is investigated theoretically. The results for the onset threshold show that previous treatments of nonoscillatory ...

    • Scaling Behavior of Quasi-One-Dimensional Vortex Avalanches in Superconducting Films 

      Qviller, Atle Jorstad; Qureishy, Thomas; Xu, Y; Suo, H; Mozhaev, PB; Hansen, J.B.; Vestgården, Jørn Inge; Johansen, Tom Henning; Mikheenko, Pavlo (2020-03-27)
      Scaling behaviour of dynamically driven vortex avalanches in superconducting YBa2Cu3O7−δ films deposited on tilted crystalline substrates has been observed using quantitative magneto-optical imaging. Two films with different ...

    • Sonar scattering from the sea bottom near the Norwegian coast 

      Vestgården, Jørn Inge; Hjelmervik, Karl Thomas; Stender, Dan Henrik Sekse; Berg, Henrik (2017)
      High false alarm rates on active sonar systems in shallow waters is a well known problem which may be a limiting factor for the sonar performance. One way to reduce the false alarm rate is through supervised learning and ...