Effects of initial cooling conditions and measurement heights on the levitation performance of bulk MgB2 superconductor at different measurement temperatures
Abstract
The levitation properties of MgB2 prepared by hot press at 200 ° C and then pellet/closed tube method has been investigated. The vertical and lateral levitation forces (Fz and Fx) on a cylindrical NdFeB permanent magnet (PM) below a disk-shaped bulk MgB2 were measured during the vertical and lateral traverses of the PM in different cooling heights (CHs) and measurement heights (MHs) at temperatures of 20, 25 and 30 K to investigate the effect of the initial CH and MH on the levitation performance of MgB2. For temperatures below 30 K, it was observed that Fz increases with increasing CH. However, a minute variation in Fz and a big hysteresis loop are observed at 30 K. From the lateral traverses, it was obtained that the Fz with attractive character increases with decreasing MH and the hysteresis effect increases for small MHs due to the increment of the magnetic field intensity which the sample feels with decreasing MH. In addition, it was seen that the character of Fx varies depending on both MH and measurement temperature. The higher hysteresis obtained in Fx than in Fz during lateral traverses implies that the motion of the flux lines in MgB2 is especially in lateral rather than vertical direction. Finally in this study, it was shown that the levitation performance of MgB2 depends not only on the measurement temperature but also on the CH and MH conditions. These results can be useful for optimizing the levitation performance of MgB2 superconductors for potential applications. © 2014 Springer Science+Business Media New York.
Source
Journal of Low Temperature PhysicsVolume
177Issue
01.FebCollections
Related items
Showing items related by title, author, creator and subject.
-
The effect of magnetic field distribution and pole array on the vertical levitation force properties of HTS Maglev systems
Ozturk K.; Abdioglu M.; Sahin E.; Celik S.; Gedikli H.; Savaskan B. (Institute of Electrical and Electronics Engineers Inc., 2015)In this paper, the levitation force measurements have been carried out by the magnetic force measurement system under both field-cooling and zero-field-cooling regimes, whereas the magnetic field distribution over the ... -
Lateral Position Effect of Auxiliary Permanent Magnets on the Magnetic Force Properties of Cylindrical YBCO
Abdioglu M.; Kabaer M.; Ozturk K.; Erdem O.; Celik S. (Springer New York LLC, 2017)The magnetic levitation force (MLF) and the guidance force (GF) should be improved for loading capacity and stability of Maglev systems, respectively. Although there are some ways to increase these properties, using of ... -
Clarification of magnetic levitation force and stability property of multi-seeded YBCO in point of supercurrent coupling effect
Ozturk K.; Kabaer M.; Abdioglu M.; Patel A.; Cansiz A. (Elsevier Ltd, 2016)In our study as different from the literature, which are mostly related to superconductor fabrication, application and optimization, especially physical origins of bulk supercurrent generation, magnetic levitation and ...