Abstract

The characteristics of an indirect-geometry spectrometer and possibilities of its creation on a compact pulsed neutron source under conditions of its low luminosity are estimated. The configuration of a secondary spectrometer with a position-sensitive detector and a curved crystal analyzer is proposed, which ensures the capture of scattered neutrons at the largest solid angle. The main parameters of the instrument are calculated analytically. Based on the technical requirements for the parameters of the instrument, the numerical simulation is constructed and calculations of the instrument resolution as a function of the energy transfer are performed applying the Monte Carlo method. The analytical resolution function and the resolution function obtained from the simulation show good agreement when considering the contribution from the pulse width. An estimate of the neutron flux on the sample is obtained. The in-principle possibility of implementation of the neutron spectroscopy method under conditions of a compact source is shown.

中文翻译：

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DARIA紧凑型中子源处的非弹性中子散射光谱仪INDIGO（间接几何）

摘要

估计了间接几何光谱仪的特性及其在低发光度条件下在紧凑型脉冲中子源上产生的可能性。提出了具有位置敏感检测器和弯曲晶体分析仪的二次光谱仪的配置，该二次光谱仪可确保以最大立体角捕获散射中子。仪器的主要参数是通过解析计算得出的。根据仪器参数的技术要求，构建了数值模拟，并使用蒙特卡洛方法对作为能量传递函数的仪器分辨率进行了计算。当考虑脉冲宽度的影响时，解析分辨率函数和从模拟获得的分辨率函数显示出良好的一致性。获得样品上中子通量的估计值。示出了在紧凑源的条件下实施中子光谱法的原理上的可能性。