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    Wyświetlanie 1-6 z 6
    Tytuł:
    The Influence of the Sample Shape on the Flux Jumps Dynamics in Conventional NbTi Superconductor
    Autorzy:
    Nabiałek, A.
    Piechota, S.
    Szymczak, H.
    Vasiliev, S.
    Chabanenko, V.
    Rusakov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812331.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Ad
    74.25.Ha
    Opis:
    We investigated giant flux jumps, caused by thermomagnetic avalanches, in two cylindrical samples of conventional NbTi-50% superconductor of the same diameter -- 14 mm, but of different heights -- 4 mm and 20 mm. We studied the influence of demagnetizing effects on the flux jumps occurrence, the amount of the magnetic flux entering the sample during the following jumps and on the flux jumps dynamics. The dynamics of the magnetic flux entering the sample is compared with the dynamics of the stray field.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 235-241
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Magnetic Field on the Dynamics of the Flux Jumps in the Flux Flow Model
    Autorzy:
    Vasiliev, S.
    Nabiałek, A.
    Rusakov, V.
    Belevtsov, L.
    Chabanenko, V.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537020.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Sv
    74.70.Ad
    Opis:
    We studied the dynamics of the flux jumps in type II superconductors assuming this dynamics to be determined by magnetic diffusion. The conductivity of the sample during the jump was described by the flux flow conductivity, which depends on local magnetic field. We solved this problem numerically for an infinite slab sample. We assumed that superconducting sample was fully penetrated by the magnetic flux at the beginning and that the local induction of the magnetic field, in the whole sample, was equal to $B_0$. Then, the external magnetic field was increased by a value of $ΔB_{a}$ and in the external magnetic field of $B_0 + ΔB_{a}$ flux jump occurred. In our simulations we used the parameters characteristic of a conventional NbTi superconductor at 4.2 K. In particular, we studied the influence of the parameter B_0 on the flux jumps' dynamics. We have found that this parameter strongly influences initial stage of the diffusion process. With increasing $B_0$, the time during which flux front of the avalanche reaches the center of the sample decreases. The results of numerical simulations were compared with experiments.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 340-342
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Magnetic History on the Stability of Critical State and the Dynamics of Flux Jumps in Conventional NbTi Superconductor
    Autorzy:
    Nabiałek, A.
    Vasiliev, S.
    Chabanenko, V.
    Perez-Rodriguez, F.
    Piechota, S.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537035.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Ad
    74.25.Sv
    Opis:
    We studied the influence of magnetic history on the stability of critical state and the dynamics of flux jumps in conventional NbTi superconductor. We have found that both the stability of critical state and the dynamics of flux jumps are strongly influenced by the magnetic history and by the magnetic field distribution induced within the sample by preceding jumps. This magnetic field distribution can be particularly complex in the region of the hysteresis loop where the external magnetic field changes its sign (region of remagnetization), because of demagnetizing effects. For this reason, the most complex structure of the flux jumps is observed in the third quadrant of magnetization hysteresis loop. Flux jumps observed in the region of remagnetization have different dynamics in comparison to the jumps observed in other regions of the magnetization hysteresis loop. Duration of these jumps is usually significantly longer than others, and their structure is more complex.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 343-345
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Giant Magnetostriction Jumps in Conventional NbTi Superconductor
    Autorzy:
    Nabiałek, A.
    Vasiliev, S.
    Chabanenko, V.
    Aleksyeyev, P.
    Rusakov, V.
    Piechota, S.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046793.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Qt
    74.70.Ad
    75.80.+q
    Opis:
    Magnetostriction of a large slab of conventional NbTi superconductor, with a diameter of about 6 mm, was investigated by the strain gauge technique. At the temperature of 4.2 K and in the external magnetic field of several T we found irreversible magnetostriction of an order of 10$\text{}^{-5}$, where the number means the relative changes of the slab diameter. This large magnetostriction is accompanied by giant magnetostriction jumps, caused by thermomagnetic avalanches. These thermomagnetic avalanches also cause giant jumps of the surface magnetization, which can be observed by using the Hall probes. The results were analyzed in the framework of the pinning induced magnetostriction model.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 633-639
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oscillating Dynamics and Trajectory of the Single Vortex Line
    Autorzy:
    Rusakov, V.
    Vasiliev, S.
    Chabanenko, V. V.
    Yurov, A.
    Nabiałek, A.
    Piechota, S.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046795.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Qt
    74.70.Ad
    Opis:
    The De Gennes and Matricon problem of finding the spectrum of oscillations of massive vortex line under the action of pinning and viscosity forces is solved. The obtained vibration spectrum of the vortex is discussed and the role of each contributing force is elucidated. The trajectory of the vortex motion is calculated and illustrated.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 641-646
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Size Effect in Impedance of Nb$\text{}_{3}$Al Superconductor
    Autorzy:
    Aleksyeyev, P.
    Nabiałek, A.
    Vasiliev, S.
    Rusakov, V.
    Chabanenko, V.
    Zalutskii, M.
    Piechota, S.
    Szymczak, H.
    Kodess, B. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046746.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Qt
    74.70.Ad
    Opis:
    We present the results of the impedance measurements in Nb$\text{}_{3}$Al superconducting polycrystalline alloy vs. temperature and magnetic field. Using these results and applying the size effect model we calculate the flux-flow conductivity of the Nb$\text{}_{3}$Al superconducting alloy near its critical temperature.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 555-559
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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