D. TimusElectron Accelerators Laboratory, Institute of Atomic Physics Institute of Physics and Technology for Radiation Devices, P.O. Box MG-36, RO-76900 Bucharest-Magurele, Romania
M. PopescuElectron Accelerators Laboratory, Institute of Atomic Physics Institute of Physics and Technology for Radiation Devices, P.O. Box MG-36, RO-76900 Bucharest-Magurele, Romania