POLANO: Wide angle spin analysis using polarising supermirrors m = 5.5
POLANO: Wide angle spin analysis using polarising supermirrors m = 5.5
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POLANO：使用偏振超级镜进行广角自旋分析 m = 5.5
DOI：
10.1016/j.nima.2020.164272
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
S. Itoh
中科院分区：
文献类型：
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作者：
M. Schneider;C. Schanzer;P. Boni;U. Filges;M. Fujita;Y. Nambu;M. Ohkawara;T. Yokoo;S. Itoh
我们报告了最近与日本东北大学和KEK合作实现的中子能量高达40 meV（λ= 1.4 μ m）的广角中子自旋分析仪（Ohoyama等人，2014; Yokoo等人，2014年）。m= 5.5/1.5的弯曲偏振Fe/Si超镜（Schanzer等人，2016）围绕样品径向布置，覆盖40°的角度范围，如果所有通道都配备有超反射镜。反射镜被NdFe B磁体产生的B ~ 40 mT的垂直永磁场饱和。利用有限元分析对其进行了优化。在瑞士空间中子源（SINQ）的束线BOA上测定了自旋过滤器的极化和透射率P=（0。975±0。01)且T up = T=（0. 55±0。017)对于λ= 3 μ m（E= 9 meV）的自旋上的中子，分别。考虑到大约三分之一的中子击中偏振叶片的正面，透射率是极好的。实验结果与使用软件包McStas的Monte Carlo模拟吻合得很好。
We report on a wide angle neutron spin analyzer for neutron energies up to 40 meV (λ= 1.4 Å) that was recently realized in collaboration with Tohoku University and KEK, Japan (Ohoyama et al., 2014; Yokoo et al., 2014). Curved polarizing Fe/Si supermirrors with m= 5.5/1.5 (Schanzer et al., 2016) are arranged radially around the sample covering an angular range of 40° if all channels are equipped with supermirrors. The mirrors are saturated by a vertical permanent magnetic field B≃ 40 mT generated by NdFeB magnets. It was optimized using finite element analysis. The polarization and transmission of the spin filter have been determined at the beamline BOA at the Swiss spallation neutron source (SINQ) to be P=(0. 975±0. 01) and T u p= T=(0. 55±0. 017) for spin-up neutrons at λ= 3 Å (E= 9 meV), respectively. The transmission is excellent considering that approximately one third of the neutrons hit the front faces of the polarizing blades. The experimental results are in good agreement with Monte Carlo simulations using the software package McStas.