A High Resolution Disk Chopper with Two-Stage Rotors for Neutron Time-of-Flight Spectroscopy

用于中子飞行时间光谱分析的具有两级转子的高分辨率圆盘斩波器

• 批准号: 08459014
• 负责人: ONO Masayoshi
• 金额: $ 5.31万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08459014/
• 关键词: Neutron Spectrometer; Neutron Disk Chopper; Bent Si Single Crystal Monochromator; Time-of-Flight Method; Neutron Scattering; Residual Stress; Industrial Materials; Metal Matrix Composites; 中性子散乱・回析

The objectives are to establish the novel version of the four kinds of Bragg scattering set-ups installed at the supermirror neutron guide hall in Kyoto University Research Reactor (5 MW,light water moderated) : i.e.the three set-ups are time-of-flight diffractometers with point detectors using neutrons from a disk chopper (TOF), and the rest set-up is a crystal diffractometer with two one-dimensional position sensitive detectors with use of neutrons from a pyrolytic graphite monochromator (PSD).1.TOF System : A novel disk chopper with two-stage rotors was designed and constructed based on the calculation of neutron transmission probability. The spectrometer was optimized with the measurements of standard sample Fe-Cr-Ni, alpha/gamma two phase steel, and supplied for the common studies by researchers from universities in Japan after its establishment, Nov.1996.(1)Performance Tests :(1)-1.Neutron wavelength resolution and its intensity became 2.5 and 3.3 times highe, resulting about 8 t … More imes improvement of the diffractometer.(1)-2.The samples of alpha/gamma steels and SiCw/Al were examined to verify the strain measurements of the crystal lattice specings over 10^<-3> to 10^<-4>. The gauge volume defined by the slit system before and after the sample was 2x30 in mm.2.PSD System : The several Si single crystals (311), i) 3x30x200, ii) 4x30x200 and iii) 4x30x200, two layrs (in mm), were used for the optimization of the monochromator device. The beam profiles of the monochromatic neutrons were characterized by the Neutron Imaging Plate method. The absolute value of the neutrons was determined by the Au-foil Activation method. The performance tests of the ststerm were carried out with the standard samples of alpha Fe.(2) Performance Tests :(2)-1.The quasi-parallel diffraction pattern from alpha Fe (211) was obtained and its FWHM was 11.4' which was consistent with the prediction.(2)-2.The angular resolution and the diffraded intensity were improved to be 10-15 times higher with repect to the conventional mosaic crystal of pyrolytic graphite monochromator. Less

目的是建立安装在京都大学研究堆超镜中子导管大厅的四种布拉格散射装置的新版本（5兆瓦，轻水慢化）：即这三种装置是具有使用来自圆盘斩波器（TOF）的中子的点检测器的飞行时间衍射仪，其余的装置是具有两个一维位置敏感探测器的晶体衍射仪，该探测器使用来自热解石墨单色器（PSD）的中子。基于中子透射几率的计算，设计并制造了一种新型的两级转子圆盘斩波器。该谱仪于1996年11月建成后，通过对Fe-Cr-Ni、α/γ两相钢等标准样品的测量，对谱仪进行了优化，供日本各大学科研人员共同研究。（1）性能试验：（1）中子波长分辨率和强度分别提高2.5倍和3.3倍，约为8 t ...更多信息 改进了衍射仪。（1）-2.对α/γ钢和SiCw/Al样品进行了检验，以验证在10 °至10 °范围内的晶格试样的应变测量<-3><-4>。在样品之前和之后由狭缝系统限定的计量体积为2 × 30 mm。2. PSD系统：使用几个Si单晶（311），i）3 × 30 × 200，ii）4 × 30 × 200和iii）4 × 30 × 200，两层（mm），用于单色器装置的优化。用中子成像板法对单色中子的束流剖面进行了表征。中子的绝对值由金箔活化法确定。用α-Fe标准样品对该仪器进行了性能测试。(2)性能测试：（2）-1.获得了α Fe（211）的准平行衍射花样，其半高宽为11.4'，与理论预测相一致。（2）-（2）角分辨率和衍射强度比常规热解石墨单色器镶嵌晶体提高10-15倍。少

项目成果

Masayoshi ONO: "A High Resolution Disk Chopper with Two-stage Rotors for Neutron Rime-of-Flight Spectroscopy" Rhysica B. (in press).

Masayoshi ONO：“用于中子飞行时间光谱学的具有两级转子的高分辨率圆盘斩波器”Rhysica B.（正在出版）。

Masayoshi Ono: "A High Resolution Disk Chopper with Two-Stage Rotors for Neutron Time-of-Flight Specfroscopy" Physica B. 234-236. 1035-1037 (1997)

Masayoshi Ono：“用于中子飞行时间光谱学的具有两级转子的高分辨率圆盘斩波器”Physica B.234-236。

Masayoshi Ono: "Neutron Scattering Instruments for Residual Strain/Stress Measurement at Kyoto University Research Reactor" Proc.5th Int.Conf.Residual Stress, Linkoping, Sweden. (in press). (1997)

Masayoshi Ono：“用于京都大学研究堆残余应变/应力测量的中子散射仪器”Proc.5th Int.Conf.Residual Stress，林雪平，瑞典。

小野 正義: "低速中性子錯乱法による金属材料の力学物性研究" 京都大学原子炉実験所第31回学術講演会講演報文集. 3-12 (1997)

小野正芳：“慢中子混淆法研究金属材料的机械性能”京都大学核反应堆研究所第31届学术会议论文集3-12（1997）。

Masayoshi Ono: ""New Focusing Si-Single Crystal Neutron Monochromator for Strain/Stress Measurements"" Proc.32th the Scientific Meetings of the Research Reactor Institute, Kyoto University. 121-126 (1998)

Masayoshi Ono：“用于应变/应力测量的新型聚焦硅单晶中子单色仪”Proc.32th 京都大学研究堆研究所科学会议。