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

Beam diagnostics based on synchrotron radiation can use imaging techniques that allow monitoring beam transverse dimensions in real time. In particular the bunch-by-bunch transverse beam diagnostics is a powerful method that allows investigations of transient phenomena in which bunch motion and beam instabilities are correlated to the position in the bunch train. Such diagnostic methods need photon array detectors with response time in the ns down to ps range and dedicated fast electronics. At DAΦNE, the e+/e^- collider of LNF/INFN, preliminary measurements with a prototype of an IR array detector made by 32x2 pixels are in progress. The array has pixel of 50x50 μm² characterized by a response time of about 1 ns per pixel measured with the IR emission of the SINBAD beamline. The array detector and the 64 channels dedicated electronics has been installed at the 3+L experiment, a dedicated diagnostics of the e⁺ DAΦNE ring used to monitor the transverse dimensions of the beam. In this paper we describe the apparatus built to obtain IR imaging of a SR source and a turn-by-turn and a bunch-by-bunch transverse diagnostics of the stored bunches with a sub-ns time resolution