Polarized neutron imaging using helium-3 cells and a polychromatic beam

2011 ◽  
Vol 651 (1) ◽  
pp. 140-144 ◽  
Author(s):  
M. Dawson ◽  
N. Kardjilov ◽  
I. Manke ◽  
A. Hilger ◽  
D. Jullien ◽  
...  
Keyword(s):  
Neutron Imaging ◽  
Helium 3 ◽  
Polarized Neutron ◽  
Polychromatic Beam

Polarized neutron imaging: A spin-echo approach

2011 ◽  
Vol 406 (12) ◽  
pp. 2415-2418 ◽  
Author(s):  
M. Strobl ◽  
C. Pappas ◽  
A. Hilger ◽  
S. Wellert ◽  
N. Kardjilov ◽  
...  
Keyword(s):  
Spin Echo ◽  
Neutron Imaging ◽  
Polarized Neutron

Polarized neutron imaging at the CONRAD instrument at Helmholtz Centre Berlin

2009 ◽  
Vol 605 (1-2) ◽  
pp. 26-29 ◽  
Author(s):  
Ingo Manke ◽  
Nikolay Kardjilov ◽  
André Hilger ◽  
Markus Strobl ◽  
Martin Dawson ◽  
...  
Keyword(s):  
Neutron Imaging ◽  
Polarized Neutron

scholarly journals Setup for polarized neutron imaging using in situ 3He cells at the Oak Ridge National Laboratory High Flux Isotope Reactor CG-1D beamline

2017 ◽  
Vol 88 (9) ◽  
pp. 095103 ◽  
Author(s):  
I. Dhiman ◽  
Ralf Ziesche ◽  
Tianhao Wang ◽  
Hassina Bilheux ◽  
Lou Santodonato ◽  
...  
Keyword(s):  
National Laboratory ◽  
Neutron Imaging ◽  
High Flux ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory ◽  
Polarized Neutron

scholarly journals Effect of apparatus polarization efficiency on quantification analysis in polarized neutron imaging

2013 ◽  
Vol 62 (16) ◽  
pp. 162801
Author(s):  
Cao Chao ◽  
Li Hang ◽  
Huo He-Yong ◽  
Tang Ke ◽  
Sun Yong
Keyword(s):  
Neutron Imaging ◽  
Quantification Analysis ◽  
Polarized Neutron

scholarly journals Improving polarized neutron imaging for visualization of the Meissner effect in superconductors

2019 ◽  
Vol 90 (3) ◽  
pp. 033705 ◽  
Author(s):  
T. Wang ◽  
C. Y. Jiang ◽  
H. Z. Bilheux ◽  
I. Dhiman ◽  
J. C. Bilheux ◽  
...  
Keyword(s):  
Meissner Effect ◽  
Neutron Imaging ◽  
Polarized Neutron

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.

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