引力谱仪GRANIT的超冷中子基础设施
Ultracold-neutron infrastructure for the gravitational spectrometer GRANIT
摘要：
引力光谱仪GRANIT将安装在劳厄朗之万研究所。它将受益于由专用源产生的高超冷中子密度。由石墨晶体与钾夹层制成的单色器将提供入射到源上的0.89 nm的中子束。该源采用超流氦中冷中子的超热转换，容器由BeO陶瓷制成，带有Be窗口。已经测试了一种特殊的提取技术，该技术仅向谱仪提供垂直速度分量v < 20 cm/s的中子，从而保持源中的高密度。这种新的光源预计将为光谱仪提供高达800 1/cm 3的密度。
英文摘要：
The gravitational spectrometer GRANIT will be set up at the Institut Laue Langevin. It will profit from the high ultracold neutron density produced by a dedicated source. A monochromator made of crystals from graphite intercalated with potassium will provide a neutron beam with 0.89 nm incident on the source. The source employs superthermal conversion of cold neutrons in superfluid helium, in a vessel made from BeO ceramics with Be windows. A special extraction technique has been tested which feeds the spectrometer only with neutrons with a vertical velocity component v < 20 cm/s, thus keeping the density in the source high. This new source is expected to provide a density of up to 800 1/cm3 for the spectrometer.
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