• L. Catani, A. Cianchi, D. Di Giovenale
  INFN-Roma II, Roma
• F. Broggi
  INFN/LASA, Segrate (MI)
• G. Di Pirro
  INFN/LNF, Frascati (Roma)

Beam Loss Position Monitors (BLPM) are diagnostic systems that, by detecting anomalies in the quantity of particles in proximity of the beam pipe, can give hint of accidental interaction of beam with vacuum pipe caused by beam lost particles providing also information on the position where the loss originated. This paper describes the design and characterization of the BLPM system proposed for the SPARC accelerator providing real-time information on the intensity and position of beam losses that might occur along the undulator section. The BLPM system will consist of optic fibers aligned to the undulator hanging few centimeters from the beam pipe. Solid state MPPC from Hamamatsu will be used to convert the Cerenkov light produced by electrons traversing the fiber into a proportional time dependent signal. By analyzing its temporal structure and by comparing the intensities between the signals from different fibers information about the sources of the beam losses can be obtained.