Exploitable results Removal of radioactivity contaminated soil As part of the rehabilitation of soils and surfaces after an accident (RESSAC) programme on possible countermeasures to be taken following a nuclear accident, the biomechanical removal of contaminated soil has been considered. The contaminated area would be seeded by helicopter with a mixture of turfing plant seeds, peat, polysaccharides, fertilizers and water since the migration rate of radioactive particles through the soil from the surface is slow grass left to grow for about a year will have trapped the majority of the contaminated particles in the dense root network. The turf, together with the top 1 to 2 cm of soil, can then be removed mechanically by a turf cutting machine and taken away for storage or decontamination. This has the advantage of removing a fairly limited volume of the soil as waste. Moreover the biodegradation of organic matter in the waste will improve leaching and chelating of caesium and strontium from the waste pile. Ergodic divertor effect on heat and particle flux in Tore Supra Modifications of power scrape off length, power deposition and hydrogen alpha recycling patterns on a pump limiter head and on the inner wall are studied during various configurations in ohmic Tore Supra plasmas. They are extremely sensitive to the current in the ergodic divertor. When the ergodic divertor is off, the power flux to the limiter is symmetric with respect to the toroidal and poloidal directions, but hydrogen alpha pattern and particle flux are asymmetric with respect to the toroidal direction. When the ergodic divertor is on, power and particle fluxes are asymmetric, as can be seen by infrared and visible hydrogen alpha light of the front face of the pump limiter. Numerical computation of magnetic topology and analytical analysis of transport have been developed for the ergodic divertor scheme and qualitative agreement is found with experimental results. A FIR laser scattering diagnostic on Tore Supra A collective laser light scattering experiment using a carbon dioxide laser beam to measure plasma density fluctuations in the Tore Supra tokamak has been realised. As the density fluctuations propagating in tokamaks have small wave numbers and require small scattering angles, such scattering experiments are considered to have no resolution along the beam. However, taking advantage of the pitch angle variation of the magnetic field lines around the magnetic axis along a vertical chord, it has been possible to obtain partial spatial localisation of the scattering volume by rotating the direction of the analysed wave vector in a horizontal plane. Heterodyne detection was used to determine the propagation direction of the fluctuations. The experiment has been tested on acoustic waves, and the first results obtained on Tore Supra show the existence of a spatial resolution. It has been extensively used on Tore Supra since 1990 to analyse plasma fluctuations Searching for OpenAIRE data... There was an error trying to search data from OpenAIRE No results available
