1. Laboratory of Accelerators and Applied Superconductivity (LASA), National Institute for Nuclear Physics (INFN), Milan Section, Milano, Italy
2. CERN, Geneva 23, Switzerland
3. Wigner Fizikai Kutatokozpont, Budapest, Hungary
4. Elytt Energy, Madrid, Spain
5. Commissariat à l'énergie atomique et aux énergies alternatives, Saclay, France
6. Little Beast Engineering, Zurich, Switzerland
7. University of Geneva, Geneva, Switzerland
8. Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Madrid, Spain