Optimisation and characterisation of neutron imaging beam at the TRIXIE instrument

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-09-25 DOI:10.1016/j.nima.2025.171032

Jana Matouskova , Burkhard Schillinger , Jaroslav Soltes , Milan Stefanik

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Abstract

The neutron imaging instrument TRIXIE is located at one of the horizontal beamlines of the research reactor LVR-15 in the Czech Republic. Before the construction of the TRIXIE instrument, the beamline was not equipped with a collimator; therefore, a new collimator had to be designed and implemented. The beamline was initially equipped with a meter-long single-crystal silicon filter. But, because of the lack of space in the beam (the size of the original filter limited the space for the collimator) and because the beamline needs to be filtered (the spectrum of an empty beamline roughly copies the reactor spectrum, with a high ratio of fast neutrons and gamma rays), a new filter had to be designed as well. The optimisation process of calculations of the collimator and filters of different materials and thicknesses was performed using the Monte Carlo calculation code MCNP. After the installation of the collimator and filters into the beamline, a series of measurements was performed to confirm the calculated results and to characterise the neutron beam.

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TRIXIE仪器中子成像束的优化与表征

中子成像仪TRIXIE位于捷克共和国研究堆LVR-15的一条水平光束线上。在TRIXIE仪器建造之前，光束线没有配备准直器；因此，必须设计和实现一种新的准直器。光束线最初配备了一个一米长的单晶硅过滤器。但是，由于束流中空间不足（原始滤波器的大小限制了准直器的空间），并且由于束流线需要过滤（空束流线的光谱大致复制了反应堆的光谱，其中快中子和伽马射线的比例很高），因此必须设计一个新的滤波器。利用蒙特卡罗计算程序MCNP对不同材料和厚度的准直器和滤波器进行了优化计算。在将准直器和滤波器安装到光束线上后，进行了一系列测量以确认计算结果并表征中子束。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.