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首页> 外文期刊>Quantum Beam Science >First Experiment of Spin Contrast Variation Small-Angle Neutron Scattering on the iMATERIA Instrument at J-PARC
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First Experiment of Spin Contrast Variation Small-Angle Neutron Scattering on the iMATERIA Instrument at J-PARC

机译：J-PARC在IMateria仪器上旋转对比变化小角中子散射的首次试验

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Recently, we have developed a novel dynamic nuclear polarization (DNP) apparatus with a magnetic field of 7 T and a sample temperature of 1 K. High proton spin polarizations from ?84% to 76%, for TEMPO doped polystyrene samples, have been demonstrated. This DNP apparatus satisfies the simultaneous requirement for quick and easy sample exchange and high DNP performance. On the iMATERIA (BL20) instrument at J-PARC, the first beam experiment using this DNP apparatus has been performed. For this experiment, the beamline was equipped with a supermirror polarizer. The stray magnetic field due to the superconducting magnet for DNP was also evaluated. The stray magnetic field plays an important role for in maintaining the neutron polarization during the transportation from the polarizer to the sample. The small-angle neutron scattering (SANS) profiles of silica-filled rubber under dynamically polarized conditions are presented. By applying our new analytical approach for SANS coherent scattering intensity, neutron polarization (PN) as a function of neutron wavelength was determined. Consequently, for the neutron wavelength, range from 4 ? to 10 ?, |PN| was sufficient for DNP-SANS studies.
机译：最近，我们开发了一种新的动态核偏振（DNP）装置，磁场7吨，并对速度掺杂的聚苯乙烯样品有7％，高质子旋转偏振，为84％至76％的样品温度。 。该DNP装置满足快速简便的示例交换和高DNP性能的同时要求。在J-PARC的IMATERIA（BL20）仪器上，已经执行了使用该DNP装置的第一光束实验。对于该实验，光束线配备有超声镜偏振器。还评估了DNP的超导磁体引起的杂散磁场。杂散磁场在从偏振器到样品的运输过程中保持中子偏振的重要作用。提出了在动态偏振条件下二氧化硅填充橡胶的小角度中子散射（SAN）型材。通过将我们的新分析方法应用于SAN的相干散射强度，确定中子偏振（PN）作为中子波长的函数。因此，对于中子波长，范围为4？到10？，| PN |足以进行DNP-SANS研究。

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