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Front Tracker : m ain t echnical solutions

Front Tracker : m ain t echnical solutions. Use COMPASS approach: 3xGEM, 2D readout - one significant difference: new single mask GEM foil (instead of double mask) – cheaper and faster production Modular design: chambers consists of 3 independent GEM modules (40x50 cm 2 ) with thin dead area

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Front Tracker : m ain t echnical solutions

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  1. SBS Front Tracker Front Tracker: main technical solutions • Use COMPASS approach: 3xGEM, 2D readout - one significant difference: new single mask GEM foil (instead of double mask) – cheaper and faster production • Modular design: chambers consists of 3 independent GEM modules (40x50 cm2) with thin dead area • Electronics around the module, direct connection; 90 degree bending between modules • External support frame in carbon fiber (long bars) to minimize thermal deformation Requirements: Hit spatial resolution ~ 70 mm Stand large background (g ~ 250 MHz/cm2, e/p 160 kHz/cm2) Transverse area > 40x120 cm2 Event rate ~ 20 kevents/s Reuse: SBS/GEp5, BigBite/Gen, BigBite/A1n … 40x50 cm2 module Front Tracker Chamber: 40x150 cm2

  2. SBS Front Tracker FT: GEM Module construction process Permaglas Frames Visual Inspection Ultrasound bath cleaning GEM Foils HV curing and quality test Module production fully established in Catania Module characterization in Rome Production speed 1 module/month Stretching Put together (align on reference pins) Gluing Electronics integration Test and characterization by rad. source and cosmics Assembling gas lines Electronics Test Clean room Glue Curing in vacuum (>24 h) Finalization (solder resistor, check HV)

  3. SBS Front Tracker Front Tracker: Readout Systems • 128 analog ch / ASIC • 3.4 ms trigger latency (analog pipeline) • Capable of sampling signal at 40 MHz • Radiation tolerant • Multiplexed analog output • Configurable / Calibration circuit VME crate

  4. Real Experiment: Olympus, 2012 Use of the INFN readout electronics The APV electronics has been installed on the Olympus 3xGEM tracker made of 6 10x10 chambers with 2D readout (pad/strip – about 2500 chs), operating in a magnetic field at the level of few kG. Two events with opposite magnet polarity; particles bend left o right in the x-histogram (Red triangles show hit candidates) From Jürgen Diefenbach SBS Front Tracker

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