Frédéric Bertrand works in the French Alternative Energies, Atomic Energy Commission (CEA), France. Andrea Bachrata works in the French Alternative Energies, Atomic Energy Commission (CEA), France. Nathalie Marie works in the French Alternative Energies, Atomic Energy Commission (CEA), France. Christophe Journeau works in the French Alternative Energies, Atomic Energy Commission (CEA), France.