论文标题
负离子源NiO1的BES诊断建模和设计
Modeling and design of a BES diagnostic for the negative ion source NIO1
论文作者
论文摘要
Consorzio RFX和INFN-LNL正在建立一个柔性的小离子源（NIO1），能够生产约130 mA的H离子在60 KEV处加速。该实验的目的是测试和开发蜘蛛和mitica的仪器，分别是负离子源的原型和将在ITER实验中运行的整个中性束喷射器的原型。作为蜘蛛和mitica，NiO1将通过束发射光谱（BES）进行监测，这是一种基于对$H_α$发射光谱的分析，该诊断是由能量离子与背景气体的相互作用产生的$H_α$发射。 BES的目的是监测离子束的方向，差异和均匀性。这些测量值的精度取决于与负离子的生产和加速度，梁的几何形状和收集光学元件有关的许多因素。在开发的一组代码中考虑了这些元素，以确定诊断的配置，从而最大程度地减少了测量误差。该模型已用于设计用于蜘蛛和Mitica的BES诊断。本文介绍了该模型，并描述了其在NiO1中设计BES诊断的应用。
Consorzio RFX and INFN-LNL are building a flexible small ion source (NIO1) capable of producing about 130 mA of H- ions accelerated at 60 KeV. Aim of the experiment is to test and develop the instrumentation for SPIDER and MITICA, the prototypes respectively of the negative ion sources and of the whole neutral beam injectors which will operate in the ITER experiment. As SPIDER and MITICA, NIO1 will be monitored with Beam Emission Spectroscopy (BES), a non-invasive diagnostic based on the analysis of the spectrum of the $H_α$ emission produced by the interaction of the energetic ions with the background gas. Aim of BES is to monitor direction, divergence and uniformity of the ion beam. The precision of these measurements depends on a number of factors related to the physics of production and acceleration of the negative ions, to the geometry of the beam and to the collection optics. These elements were considered in a set of codes developed to identify the configuration of the diagnostic which minimizes the measurement errors. The model was already used to design the BES diagnostic for SPIDER and MITICA. The paper presents the model and describes its application to design the BES diagnostic in NIO1.
