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1
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Moderation of the Flux Jumps Dynamics by Eddy-Currents in a Disk Shape NbTi Superconductor

100%
Vasiliev S., Chabanenko V., Nabiałek A., Rusakov V., Piechota S., Szymczak H.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
777-783
EN
We studied the moderation of the flux jumps dynamics in a disc shape NbTi-50% superconductor caused by eddy-currents induced in two copper cylinders attached to both surfaces of the investigated sample. We investigated experimentally the time of the flux jump duration, amount of the magnetic flux entering the sample during the jump as well as the fine structure of the jumps as a function of temperature and the external magnetic field. A simple theoretical model, which describes the magnetic field dependence of the amount of the magnetic flux entering the superconducting sample during the flux jump, was developed.
2
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The Structure of Thermomagnetic Avalanches in Superconducting Disc of NbTi

100%
Vasiliev S., Nabiałek A., Chabanenko V., Rusakov V., Piechota S., Szymczak H.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
661-668
EN
We investigated dynamics of giant flux jumps, caused by thermomagnetic avalanches, in superconducting disc of conventional NbTi-50% superconductor. We studied surface magnetization, as well as changes of magnetic flux in the superconducting sample and in the area around it. The influence of the magnetic history on the flux jumps structure was investigated. The most complex structure of the flux jumps was found during sample remagnetization. The comparison between dynamic changes of the magnetic flux in the sample and in the area around it shows that, at the last stage of the thermomagnetic avalanche, a process of magnetic flux redistribution in the superconductor's volume occurs. This process is not accompanied by an entrance of additional flux lines into the superconductor's volume.
3
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The Influence of the Sample Shape on the Flux Jumps Dynamics in Conventional NbTi Superconductor

100%
Nabiałek A., Piechota S., Szymczak H., Vasiliev S., Chabanenko V., Rusakov V.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
235-241
EN
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.
4
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The Influence of the Magnetic Field on the Dynamics of the Flux Jumps in the Flux Flow Model

100%
Vasiliev S., Nabiałek A., Rusakov V., Belevtsov L., Chabanenko V., Szymczak H.
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issue 2
340-342
EN
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.
5
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Giant Magnetostriction Jumps in Conventional NbTi Superconductor

100%
Nabiałek A., Vasiliev S., Chabanenko V., Aleksyeyev P., Rusakov V., Piechota S., Szymczak H.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
633-639
EN
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^{-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.
6
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Oscillating Dynamics and Trajectory of the Single Vortex Line

100%
Rusakov V., Vasiliev S., Chabanenko V., Yurov A., Nabiałek A., Piechota S., Szymczak H.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
641-646
EN
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.
7
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Size Effect in Impedance of Nb_3Al Superconductor

84%
Aleksyeyev P., Nabiałek A., Vasiliev S., Rusakov V., Chabanenko V., Zalutskii M., Piechota S., Szymczak H., Kodess B.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
555-559
EN
We present the results of the impedance measurements in Nb_3Al 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_3Al superconducting alloy near its critical temperature.
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