1. LNDES, O. Ya. Usikov Institute for Radiophysics and Electronics, NASU,Kharkiv,Ukraine
2. O. Ya. Usikov Institute for Radiophysics and Electronics NASU,Department for Diffraction Electronics,Kharkiv,Ukraine
3. Instituto de Física Teórica - UNESP,São Paulo,Brazil
4. O. Ya. Usikov Institute for Radiophysics and Electronics NASU,Department for Vacuum Electronics,Kharkiv,Ukraine
5. LNDES, O. Ya. Usikov Institute for Radiophysics and Electronics NASU,Kharkiv,Ukraine
6. O. Ya. Usikov Institute for Radiophysics and Electronics, NASU,Department for Vacuum Electronics,Kharkiv,Ukraine