On Wednesday September 7th, in Tours, Anthony Rondeau received the Jean Bricard Award from the French Association for the Study and Research on Aerosols (Association française d’études et de recherches sur les aérosols, Asfera) at the 22nd European Aerosol Conference (EAC-2016). The award has been presented to him in recognition of his thesis - conducted at IRSN and defended on December 7th, 2015, in Saclay - on the study of accidental dust resuspension by airflow in the future ITER tokamak.
This work is an important contribution to the experimental study of the consequences of a loss of vacuum accident inside the torus (resulting in the ingress of air mixed with steam at very high speed) on the resuspension of metal particles — mainly tungsten — produced by the erosion of the tokamak walls during plasma operation and deposited on the internal walls of the vacuum chamber. The work of Anthony Rondeau has provided new and accurate experimental data to develop and validate a particle resuspension model applicable to low pressure environments, for estimating the fraction of particles mobilised during such an event.
In the IRSN physics and aerosol metrology laboratory (SCA/LPMA) and at the University of Aarhus (Denmark), Anthony Rondeau performed breakthrough experiments on airflow re-suspension as a function of the main parameters that condition the mechanisms involved: diameter and volumetric density of the particles, pressure and shear velocity. The particles concerned, as sampled from tokamaks in operation, have diameters ranging from 0.1 to 10 µm. Anthony Rondeau emphasised the specific behaviour of multilayer deposits and the agglomeration of fine particles, which are phenomena that lead to a more significant fraction of mobilised particles than that predicted by the models currently used.
At IRSN, these results are intended to be integrated into the calculation models to assess the potential risk of a dust explosion during accident scenarios in the ITER facility, as well as the energy output of the explosion and its mechanical effects, which are directly correlated with the amount of dust resuspended.
Every year since 1998, the Jean Bricard Award is presented to a young French researcher whose thesis work is considered by the aerosol scientific community to be original, and the value of which is likely to influence future work in its field. ASFERA thus aims to promote research in aerosol science, of which Professor Jean Bricard (1907-1988) is considered to be the founder in France.
Photo: Anthony Rondeau receiving his award © IRSN