1. TAE Technologies, 19631 Pauling, Foothill Ranch, California 92610
2. Ecole Polytechnique, Route de Saclay, 91128 Palaiseau, France
3. Institut de Physique Nucléaire d’Orsay, IN2P3/CNRS and University Paris-Sud, 91406 Orsay Cedex, France
4. University of Strasbourg, 4 Rue Blaise Pascal, 67081 Strasbourg, France