scholarly journals Polarized neutron imaging and three-dimensional calculation of magnetic flux trapping in bulk of superconductors

2012 ◽  
Vol 85 (18) ◽  
Author(s):  
Wolfgang Treimer ◽  
Omid Ebrahimi ◽  
Nursel Karakas ◽  
Ruslan Prozorov
Keyword(s):  
Magnetic Flux ◽  
Three Dimensional ◽  
Neutron Imaging ◽  
Flux Trapping ◽  
Polarized Neutron ◽  
Magnetic Flux Trapping

scholarly journals Study of Possible Frequency Dependence of Small AC Fields on Magnetic Flux Trapping in Niobium by Polarized Neutron Imaging

2021 ◽  
Vol 11 (14) ◽  
pp. 6308
Author(s):  
Wolfgang Treimer ◽  
Tobias Junginger ◽  
Oliver Kugeler
Keyword(s):  
Magnetic Flux ◽  
Continuous Wave ◽  
Flux Line ◽  
Neutron Imaging ◽  
Type I ◽  
Flux Trapping ◽  
Trapped Flux ◽  
Polarized Neutron ◽  
Ac Fields ◽  
Magnetic Flux Trapping

Reducing the size of ambient magnetic flux trapping during cooldown in superconducting radio-frequency niobium cavities is essential to reaching the lowest power dissipation as required for continuous wave application. Here, it is suggested that applying an alternating magnetic field superimposed to the external DC field can potentially reduce the size of trapped flux by supporting flux line movement. This hypothesis is tested for the first time systematically on a buffered chemically polished (BCP) niobium sample before and after high temperature annealing, a procedure which is known to reduce flux pinning. External low-frequency (Hz-range) magnetic fields were applied to the samples during their superconducting transition and the effect of varying their amplitude, frequency and offset was investigated. A few results can be highlighted: The influence of the frequency and magnitude of the AC fields on the flux trapping in the untreated Nb sample cannot be neglected. The trapped flux seems to be homogeneously distributed, unlike the flux trapping in, e.g., lead (Pb), which is a type I superconductor. After annealing, the Nb sample shows practically no dependency of flux trapping on external AC fields. The trapped magnetic flux was measured by polarized neutron imaging, and calculations of trapped fields show good agreement with experimental results.

scholarly journals Magnetic Flux Trapping and Flux Jumps in Pulsed Field Magnetizing Processes in REBCO and Mg-B Bulk Magnets

2020 ◽  
Vol 1590 ◽  
pp. 012025
Author(s):  
T Oka ◽  
A Takeda ◽  
H Oki ◽  
K Yamanaka ◽  
L Dadiel ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Pulsed Field ◽  
Flux Trapping ◽  
Flux Jumps ◽  
Magnetic Flux Trapping

Investigation of magnetic flux trapping in high-T/sub c/ thin films by scanning SQUID microscope

2001 ◽  
Vol 11 (1) ◽  
pp. 238-241 ◽  
Author(s):  
K. Suzuki ◽  
S. Adachi ◽  
Yijie Li ◽  
T. Utagawa ◽  
K. Tanabe
Keyword(s):  
Thin Films ◽  
Magnetic Flux ◽  
Flux Trapping ◽  
Scanning Squid ◽  
Magnetic Flux Trapping
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