| Autor: |
Hui-Chia Su, Chih-Hao Lee, Hsin-Ho Chang, Yu-Han Wu, Chih-Wei Hu, L. J. Chang, A. Ioffe, H. T. Kraan, Abdul Aziz Bin Mohamed |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings. |
| ISSN: |
0094-243X |
| Popis: |
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 400 n/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. N... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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