• A. Bocci, M. Cestelli Guidi, A. Clozza, A. Drago, A. Grilli, A. Marcelli, A.R. Raco, R.S. Sorchetti
  INFN/LNF, Frascati (Roma)
• A. De Sio, E. Pace
  Università degli Studi di Firenze, Firenze
• L. Gambicorti
  INOA, Firenze
• J.P. Piotrowski
  VIGO System S.A., Ozarow Maz.

At the LNF of INFN an IR array detector with a ns response time has been built and assembled in order to collect the IR image of the e-/e⁺ sources at DAΦNE. Such detector is made by 32 bilinear pixels with a pixel size of 50x50 μm² and a response time of 1 ns. The device with its electronic board has been assembled for the installation on the e⁺ ring of DAΦNE in the framework of an experiment funded by the INFN Vth Committee dedicated to beam diagnostics. A preliminary characterization of few pixels of the array and of the electronics has been carried out at the IR beamline SINBAD at DAΦNE. In particular the detection of the IR source of the e^- beam has been observed using four pixels of the array acquiring signals simultaneously with a 4 channels scope at 1GHz and at 4 Gsamples/s. The acquisition of 4 pixels allowed monitoring in real time differences in the bunch signals in the vertical direction. Preliminary analysis of data is presented and discussed. In particular we will outline how the differences in the signals can be correlated to small displacements of the source after the bunch refilling and during a complete shift of DAΦNE and before the refilling of electrons.