Abstract The Divertor Tokamak Test (DTT) facility, whose design phase is currently under finalization, is an Italian project aimed to investigate alternative power exhaust solutions for DEMO. It is designed to operate with significant power loads and enough flexibility to test innovative divertor configurations, different plasma edge and bulk conditions approaching, as much as possible, those planned for DEMO. Among the neutron diagnostics, a multi-channel neutron camera, most likely equipped with the liquid scintillators NE213, is foreseen to provide spatially resolved measurements of several plasma parameters needed for fusion power estimation, plasma control and plasma physics studies. This paper presents a preliminary study performed in support of the DTT neutron camera design. A detailed MCNP model representing a 20° sector of the machine integrating its main components and detectors assemblies has been developed and used for this study. Three-dimensional neutron transport simulations have been carried out by means of the MCNP Monte Carlo code coupled with the FENDL nuclear data libraries. The diagnostic design was optimized starting from the assessment of the expected detector performances obtained by using the calculated neutron fluxes and spectra and the NE213 response functions. The outcomes of this analysis provide the detectors requirements and guidelines for the development of the above-mentioned diagnostics, investigating its feasibility and suitability with the neutron emissivity foreseen for the DTT operational scenarios.

中文翻译：

---

支持 DTT 托卡马克径向中子相机概念设计的中子分析

摘要 Divertor Tokamak 测试 (DTT) 设施的设计阶段目前正在敲定，是一个意大利项目，旨在研究 DEMO 的替代动力排放解决方案。它设计用于在显着的功率负载和足够的灵活性下运行，以测试创新的偏滤器配置、不同的等离子体边缘和体积条件，尽可能接近 DEMO 计划的那些条件。在中子诊断中，最有可能配备液体闪烁体 NE213 的多通道中子照相机预计将提供聚变功率估计、等离子体控制和等离子体物理研究所需的几个等离子体参数的空间分辨测量。本文介绍了为支持 DTT 中子相机设计而进行的初步研究。本研究开发并使用了一个详细的 MCNP 模型，该模型代表了机器的 20° 扇区，集成了其主要部件和探测器组件。已经通过 MCNP 蒙特卡罗代码结合 FENDL 核数据库进行了三维中子输运模拟。从使用计算的中子通量和光谱以及 NE213 响应函数获得的预期探测器性能的评估开始，对诊断设计进行了优化。该分析的结果为上述诊断的开发提供了探测器要求和指南，研究了其可行性和适用性，以及为 DTT 操作场景预见的中子发射率。