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SBS/Front Tracker

The GEM-based tracker will feature up to 6 chambers, each measuring 150x40 cm², with 3 modules of 40x50 cm² per chamber. Funded by INFN with a budget of approximately 1 million USD for R&D and production, the tracker is intended for various configurations in the SBS and BigBite experiments. Recent advancements include refined GEM foil quality checks, successful beam tests on modules, and enhancements in electronics. The project aims for pre-final module assembly and is on track for completion of three chambers by the end of 2014 and full assembly by the end of 2015.

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SBS/Front Tracker

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  1. E. Cisbani – SBS Front Tracker Summary SBS/Front Tracker • Up to 6 chambers 150x40 cm2; each chamber has 3 40x50 cm2 modules, based on the GEM technology. The tracker will be used in different configurations in SBS and BigBite. • Funded by INFN for ~1 MUSD (R&D + Production). • Latest activities: • GEM foil quality check redefined after negative results on the first 4 foils: new procedure defined with the help of CERN+UVa experts: first step consists in an aggressive cleaning based on quick HV ramp up. • DESY Beam Test: two modules tested in magnetic field up to 500 Gauss with few GeV electron beam. Analysis in progress • Electronics Advances: final MPD version including advices of JLab DAQ experts; new front-end card with Panasonic connector. • GEM foil improvement: protective resistor pads outside the inner frame, for easier access; added pads for capacitor coupling to readout plane • Electronic Noise: noise at the level of 10 ADC units when strips are connected to the card inputs. • Status of construction: • - 3 <pre-final> modules assembled; • - expected construction of 1 module/month • - 3 complete chambers by the end of 2014 • - rest of the chambers by the end of 2015 First «pre-final» GEM module + Electronics • Requirements: • Hit spatial resolution <100 mm • Stand large background flux •  250 MHz/cm2g •  160k/cm2 charged particles • Active area 120x40 cm2 • Acquisition rate ~20 kevt/s APV25 based front-end

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