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Neutron profiles and fuel ratio n(T)(D) measurements in JET ELMy H-mode plasmas with tritium puff

机译:带有p的JET ELMy H型等离子体中的中子分布和燃料比n(T)/ n(D)测量

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摘要

Two-dimensional (2D) spatial profile and the temporal evolution of the 14 and 2.5 MeV neutron emissivities from D-D and D-T fusion reactions were studied using the measurements of the upgraded neutron profile monitor during the last trace tritium experiments in JET. The JET neutron profile monitor provides unique capability for 2.5 and 14 MeV neutrons line-integrated measurements simultaneously. A systematic comparison of D-D and D-T neutron emissivity was performed. The tritium concentration or fuel ratio (n(T)(D)) was analysed for a set of 34 ELMy-H mode discharges with tritium puff. Tritium concentration is deduced with a method based on the ratio of D-T 14 MeV and D-D 2.5 MeV neutron emissivities in order to exploit the maximum information available from neutron data. With the help of a tomography algorithm recently developed at JET, 2D spatial profiles of the tritium concentration in the plasma were obtained. These profiles can be used to perform transport studies. Tritium core confinement is clearly seen to increase with plasma density for the set of discharges studied. Differences in the shape of these profiles are also found between low and high density plasmas. Shortly after tritium puffing, 2D spatial profiles of the tritium concentration exhibit typical hollow profiles and in some cases transient poloidal asymmetric features have been observed in 2D images.
机译:在JET的最后一次痕量experiments实验期间,使用升级后的中子剖面监测仪的测量结果,研究了二维(2D)空间剖面以及D-D和D-T聚变反应产生的14 MeV和2.5 MeV中子发射率的时间演化。 JET中子剖面监测仪可同时进行2.5 MeV和14 MeV中子线的集成测量。对D-D和D-T中子发射率进行了系统比较。用for吹气分析了一组34种ELMy-H模式放电的浓度或燃料比(n(T)/ n(D))。 D浓度的计算方法是基于D-T 14 MeV与D-D 2.5 MeV中子发射率之比,以便利用中子数据提供的最大信息。借助于最近在JET开发的层析成像算法,获得了血浆中tri浓度的二维空间分布图。这些配置文件可用于执行运输研究。对于所研究的一组放电,clearly气的限制明显随等离子体密度而增加。在低密度和高密度等离子体之间也发现了这些轮廓的形状差异。 tri膨胀后不久,2浓度的2D空间轮廓呈现出典型的空心轮廓,在某些情况下,在2D图像中观察到了短暂的非对称性。

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