SBS Front Tracker GEM short update on inefficient sectors

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Presentation transcript:

SBS Front Tracker GEM short update on inefficient sectors 29/May/2017 E. Cisbani 12/4/2018 FT status - Inefficient Sectors

Origin of Inefficient sector The HV distribution line is interrupted between the protective resistor and the border of the GEM frame – the sector does not get HV. Cut is likely due to eccessive soldering of the protective resistor which extends beyond the expected pads (see GEM radiography) combined to bending of the kapton foil due to module handling (and/or transportation): the extra soldered border acts as blade for the HV line Internal GEM Protective resistor area HV common HV path GEM Radiography Frame 12/4/2018 FT status - Inefficient Sectors

Recovering inefficient sectors – mod 9 & 14 short sector Fixed (2 foils) (1 foil) Before Xray irradiation Fixed (1 foil) After 12/4/2018 FT status - Inefficient Sectors

Conclusion (on inefficient sectors) Inefficient sectors can be recovered by soldering a thin wire jumper across the HV line cut All inefficient sectors fixed so far (5 on 2 modules) work well We expect to recover all inefficient sectors (13) We are adopting some precautions: Solder the resistor on the designed small pads (do not extend soldering on the HV path) Handle GEM foils with extra care GEM packing for transportation to be revised Work is in progress for the short sectors (9) 12/4/2018 FT status - Inefficient Sectors

FT status - Inefficient Sectors FT Status Summary GEM modules 6 modules at JLab: 3 of them need inefficient sector fixing, 1 looks completely dead – rework planned in July/2017 9 modules in Rome: 3 fully tested and fixed, 4 on queue for x-ray testing and reworking (if needed), 2 ready for HV training – 6 modules plan to be delivered at JLab within mid July (if test/rework will be fine) and then assembled into chambers second half of July. 3 modules in Catania waiting completion: 2 almost completed (missing readout window FR4 frames  ordered), 1 in the queue for assembling 3 additional modules planned (material ordered at CERN, ready in June) (2 modules rejected so far, due to problems during assembling) Chamber Carbon Frame First complete frame tested on May/15th (couple of details need minor rework); expected delivery of all frames (6 chambers) to JLab from company (RIBA composites) within mid July Electronics/DAQ Hardware: all seems to be on hands, except optical fiber transcievers and proper length (10 m?) HDMI cables Firmware: SSP-MPD integration largely completed; work in progress in bug fixing and performances improvement 12/4/2018 FT status - Inefficient Sectors