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

Journal Article · Tue Jan 05 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3295610· OSTI ID:21366884

Su, H -C; Chang, H -H; Hu, C -W ^[1]; Lee, C -H; Wu, Y -H ^[1]; Chang, L J ^[2]; Ioffe, A ^[3]; Kraan, H T ^[4]

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1. Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan 30013 (China)
2. Nuclear Science and Technology Development Center, National Tsing Hua University, Hsinchu, Taiwan 30013 (China)
3. Juelich Centre for Neutron Science (JCNS) Forschungszentrum Juelich Outstation at FRM-II, Lichtenbergstrasse 1, D-85747 Garching (Germany)
4. Delft University of Technology, Delft (Netherlands)

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 mu-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 400 n/cm{sup 2}s 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 mum at virgin state and about 3.1 mum 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.

• OSTI ID: 21366884
• Journal Information: AIP Conference Proceedings, Vol. 1202, Issue 1; Conference: International conference on neutron and X-ray scattering - 2009, Kuala Lumpur (Malaysia), 29 Jun - 1 Jul 2009; Other Information: DOI: 10.1063/1.3295610; (c) 2009 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMMISSIONING
CRYSTALS
DEPOLARIZATION
FERRITES
METALS
MONOCHROMATORS
NEUTRONS
PARTICLE SIZE
POLARIZABILITY
POLARIZATION
POLYMERS
POROSITY
POWDERS
SCATTERING
BARYONS
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FERRIMAGNETIC MATERIALS
HADRONS
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
NUCLEONS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIZE
TRANSITION ELEMENT COMPOUNDS