The experts who will closely supervise the ESRs are: Prof. C. Alexandrou, Prof. V. Harmandaris, Assoc. Prof. G. Koutsou, Assist. Prof. N. Savva, Assist. Prof. M. Nicolaou (CyI); Prof. K. Borras (DESY-Hamburg), Dr. K. Jansen (DESY-Zeuthen), Prof. S. Montangero (UNIPD), Prof. D. J. Verschuur (TUDelft), Prof. K. Kremer (MPIP), Prof. C. Makridakis, Dr. E. Kalligiannaki (FORTH); Prof. M. Müller (UGOE); Dr. A. Lausi (SESAME); Prof. V. Favre-Nicolin, Prof. P. Bruno, Dr. A. Pacureanu (ESRF).