Search

Quantitative depth profiling measurements of implanted light elements is an important issue for electronics and nuclear applications. Conventional elastic recoil detection analysis (ERDA) has been improved by using heavy ions as incident particles for quantitatively profiling helium in materials. A new system has been implemented on the triple beam irradiation platform JANNUS at Saclay devoted to carry out HI-ERDA measurements. This device is dedicated to helium depth profiling using a 15 MeV 16 O 5+ incident ion beam. Capabilities of the technique (quantitative analysis, resolution and limit of detection) were tested on samples of known composition. For the first time, 4 He depth profiles in pure α-iron, as-implanted and annealed, are obtained. HI-ERDA measurements have shown that helium release in pure α-iron can be described by a succession of two steps, the first having a slow kinetics below 700 °C and the second with a fast kinetics above 700 °C. [ABSTRACT FROM AUTHOR]

Abstract: The Joint Accelerators for Nanosciences and NUclear Simulation project was started in 2002 in the frame of collaboration between CEA and CNRS. Due to the scientific skills developed for a long time, two experimental sites have been considered: (1) at Saclay, three electrostatic accelerators are being coupled, a new 3MV Pelletron machine equipped with a multi-charged ion source, a 2.5MV single ended Van de Graaff and a 2.25MV tandem and (2) at Orsay, a 2MV tandem and a 190kV ion implanter are being coupled together with a 200kV transmission electron microscope to allow simultaneous co-irradiation and observation. A brief review is first presented on multi-irradiation facilities available in the world. Then, a technical description of the new experimental facilities being installed is given. The main experiments we intend to carry out using mono, dual or triple irradiation configurations in different nuclear application fields and especially in the fusion domain will be further presented. [Copyright &y& Elsevier]

Abstract: Multiple ion beam facilities have been used for nearly 30 years to simulate the irradiation effects of neutrons on relevant nuclear materials. Simultaneous ion beam irradiation allow the study of structural damage and foreign atoms accumulation in a broad range of parameters (projected range, temperature, dose rate, fluence, nuclear over electronic stopping power ratio) coupled with characterization of the investigated material. First, a review is given on the multi-irradiation facilities in operation worldwide. Then, the progress report of the Joint Accelerators for Nanosciences and NUclear Simulation project (JANNUS) is presented. In the third part of this paper, the main planned activity fields using JANNUS will be discussed i.e. the study of irradiation behaviour of nuclear materials, the controlled modification of materials properties by ion beam irradiation/implantation and the teaching of ion beam interactions with solids, ion beam physics and ion beam analysis. [Copyright &y& Elsevier]