论文标题
在负离子源蜘蛛中的腔环下光谱诊断的开发和首次操作
Development and first operation of a Cavity Ring Down Spectroscopy diagnostic in the negative ion source SPIDER
论文作者
论文摘要
ITER实验的中性束注射器将依靠负离子源产生16.7 MW梁的H/D颗粒，以1 MeV加速。这些来源的原型是建立的，目前是在蜘蛛实验中运行的（从RF等离子体中提取的离子O氘的生产来源），这是Consorzio RFX的中性束测试设施的一部分，Padua。在蜘蛛中，H-/D-ION源与三个网格100 kV加速度系统耦合。蜘蛛实验的主要目标之一是均匀地最大化提取的电流密度。为了实现这一目标，重要的是研究离子加速系统接近的负离子的密度。在蜘蛛中，通过腔环下光谱（CRDS）诊断进行了负离子密度的线集成测量。它的操作原理基于H-/d-photo-detachment对激光束脉冲的光子的吸收。通过将激光脉冲捕获在光腔中，包含吸收培养基（即负离子），从而增强了吸收检测。该论文在蜘蛛中介绍并讨论了CRDS诊断设置，包括与主要源参数相关的负离子密度的首次测量。
The Neutral Beam Injectors of the ITER experiment will rely on negative ion sources to produce 16.7 MW beams of H/D particles accelerated at 1 MeV. The prototype of these sources was built and is currently operated in the SPIDER experiment (Source for the Production of Ions o Deuterium Extracted from an RF plasma), part of the Neutral Beam Test Facility of Consorzio RFX, Padua. In SPIDER, the H-/D- ion source is coupled to a three grids 100 kV acceleration system. One of the main targets of the experimentation in SPIDER is to uniformly maximize the extracted current density; to achieve this it is important to study the density of negative ions available in proximity of the ion acceleration system. In SPIDER, line-integrated measurements of negative ion density are performed by a Cavity Ring Down Spectroscopy (CRDS) diagnostic. Its principle of operation is based on the absorption of the photons of a laser beam pulse by H-/D- photo-detachment; the absorption detection is enhanced by trapping the laser pulse in an optical cavity, containing the absorbing medium (i.e. negative ions). The paper presents and discusses the CRDS diagnostic setup in SPIDER, including the first measurements of negative ion density, correlated to the main source parameters.
