1. Lancaster University, Lancaster, U.K.
2. Cockcroft Institute, Warrington, U.K.
3. Institute of Electrical Engineering, SAS, Dúbravská cesta 9, Bratislava, Slovakia
4. Institute of Technical Physics, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Riga, Latvia
5. European Organization for Nuclear Research, Geneve, Switzerland
6. Istituto Nazionale di Fisica Nucleare Laboratori Nazionali di Legnaro, Legnaro, Italy
7. Universitat Siegen, Siegen, Germany
8. Department of Physics, University of Victoria, Victoria, BC, Canada