• M. Boscolo, M. Castellano, E. Chiadroni, M. Ferrario
  INFN/LNF, Frascati (Roma)
• P. Calvani, S. Lupi, A. Nucara
  Università di Roma I La Sapienza, Roma
• B. Marchetti
  INFN-Roma II, Roma
• A. Perucchi
  ELETTRA, Basovizza
• V. Petrillo
  Universita' degli Studi di Milano, Milano
• A.R. Rossi
  Istituto Nazionale di Fisica Nucleare, Milano

A feasibility study for a dedicated beamline for a THz radiation source at SPARC is discussed. A radiofrequency electron gun followed by a compressor can generate trains of THz sub-picosecond electron pulses by illuminating the photocathode with a comb laser pulse. This structure of the beam can be used to produce coherent radiation. The quality of the coherent spectrum emitted by a comb beam is tightly connected to the electron micro-bunches lengths and to micro-pulses inter-distance. Beam dynamics studies are summarized here and compared to a conventional single bunch case, optimized for the THz radiation generation. The dynamics is studied within the SPARC system with the PARMELA code and with the RETAR code for the evaluation of the radiation.