<empty>
Home Trabalhos Científicos Artigos em Revistas Científicas Nuclear Fusion

Nuclear Fusion

Neutron profiles and fuel ratio nT/nD measurements in JET ELMy H-mode plasmas with tritium puff
 
Bonheure, G., S. Popovichev, L. Bertalot, A. Murari, S. Conroy, J. Mlynar, I. Voitsekhovitch and JET-EFDA contributors
  2006
  DOI
 
Resumo
 

Two-dimensional (2D) spatial profile and the temporal evolution of the 14 and 2.5MeV 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 14MeV neutrons line-integrated measurements simultaneously. A systematic comparison of D–D and D–T neutron emissivity was performed. The tritium concentration or fuel ratio (nT/nD) 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 14MeV and D–D 2.5MeV 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.

 

Versão Portuguesa Englsih Version Páginia Inicial / Main Page

[ Artigos em Revistas Científicas ] [ Comunicações a Reuniões Científicas ] [ Teses de Mestrado ] [ Teses de Doutoramento ] [ Relatórios Internos ]

Webmaster
Copyright © 2008 Centro de Fusão Nuclear