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The INFN Roma silicon detectors will work in front of the magnet of the SBS spectrometer [Fig. 1] , giving the first tracking of each particle. The silicon detectors have a custom design [Fig. 2] developed in order to maximize the active area obtainable using a silicon wafer with 150 mm (6") of diameter, available from Hamamatsu Photonics foundry. There are 5 detectors with a thickness of 320 µm, a strip pitch of 50 µm for a total of 2070 channels for each detector. A couple of detectors will form the X plane and a second couple will form the Y plane. In order to connect each detector to the front-
At the end a complete detector will be equipped with 5 backplanes and 20 APV25 boards [Fig. 5]. Because of the need of containing the size of detector, the PCB will be equipped with two layers of backplanes, one for each side of the detector and with one backplane on the third side in addition. The entire detector-