The commissioning of a three dimensional depolarized neutron beamline for studying the magnetic correlation length of a magnetic material at Tsing Hua open-pool reactor

Hui Chia Su, Chih Hao Lee, Hsin Ho Chang, Yu Han Wu, Chih Wei Hu, L. J. Chang, A. Ioffe, H. T. Kraan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new three dimensional neutron depolarization beamline was commissioning at W3 beam port of Tsing Hua Open Pool Reactor (THOR, 2 MW) located in Hsinchu, Taiwan. The beamline consists of a pair of Heusler crystals as neutron polarizer and analyzer. Two three-dimensional rotators were placed before and after the sample position. The sample chamber was enclosed in a μ-metal enclosure with a gradient field at incident and exit ports. Typically, 0.237 nm of monoenergetic neutron was selected for experiments. A flipping ratio of 23 can be obtained which corresponds to a polarization ratio of 92% of this beamline. The typical intensity is 400n/cm2s at 1 MW operation. Magnetic correlation lengths of Ni-ferrite powders with different packing densities were measured to understand the characteristics of this beamline. The magnetic correlation lengths were observed to be 2 μm at virgin state and about 3.1 μm at remanent state. This magnetic correlation length in the virgin state is similar than the particle size. No significant change of domain size at packing density up to 60% implies that the domain wall motion is hindered by the porosity of the sample.

Original languageEnglish
Title of host publicationNeutron and X-Ray Scattering in Advancing Materials Research - Proceedings of the International Conference on Neutron and X-Ray Scattering - 2009
Pages54-57
Number of pages4
DOIs
Publication statusPublished - 2009 Dec 1
EventInternational Conference on Neutron and X-ray Scattering 2009, ICNX2009 - Kuala Lumpur, Malaysia
Duration: 2009 Jun 292009 Jul 1

Publication series

NameAIP Conference Proceedings
Volume1202
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherInternational Conference on Neutron and X-ray Scattering 2009, ICNX2009
CountryMalaysia
CityKuala Lumpur
Period09-06-2909-07-01

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Su, H. C., Lee, C. H., Chang, H. H., Wu, Y. H., Hu, C. W., Chang, L. J., Ioffe, A., & Kraan, H. T. (2009). The commissioning of a three dimensional depolarized neutron beamline for studying the magnetic correlation length of a magnetic material at Tsing Hua open-pool reactor. In Neutron and X-Ray Scattering in Advancing Materials Research - Proceedings of the International Conference on Neutron and X-Ray Scattering - 2009 (pp. 54-57). (AIP Conference Proceedings; Vol. 1202). https://doi.org/10.1063/1.3295610