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Séminaire présenté par le Dr. Tereshatov Evgeny, Lawrence Livermore National Laboratory

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Radiochemical analysis of gaseous samples at National Ignition Facility and Superheavy Element Chemistry Research

Par : Dr. Tereshatov Evgeny, Lawrence Livermore National Laboratory
Date : lundi 18 novembre 2013 à 11h
Lieu : IPHC, Amphithéâtre Grünewald, bâtiment 25

Résumé :

The scientific challenge of controlling thermonuclear reactions for civil purposes can be realized through research programs designed to obtain an economical source of fusion energy. The National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL, USA) is a unique, laser-based inertial confinement fusion facility consisting of 192 laser beams that are designed to create a self-sustaining thermonuclear reaction as a practical energy source. Development of neutron and charged particle diagnostics is required for understanding the processes that take place during a NIF laser shot.

The Radiochemical Analysis of Gaseous Samples (RAGS) system is a diagnostic apparatus designed to collect and purify gaseous reaction products from neutron activation, charged particle reactions, or fission products formed during a NIF capsule implosion. The purpose of this work was to optimize theRAGS system parameters, estimate the collection efficiency for Xe, and to study the in-shot response of the RAGS apparatus using Xe isotopes that have been added to a NIF capsule. This presentation discusses the components of the RAGS system and their corresponding operational methods, off-line calibration of the system components, on-line implementation during a NIF shot, and a RAGS background test using a capsule loaded with deuterium-tritium fuel.

The second part of the presentation is devoted to superheavy element synthesis and chemical properties investigation that have been carried out recently. My talk will cover set-ups for studying Cn, Fl, element 113, and an automated system for off-line liquid phase experiments. Also some results, including element 119/120 synthesis, will be shown.

Personne à contacter : Quentin RAFFY