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The Bigbite second GEM tracker

The Bigbite second GEM tracker. SBS GEM Trackers. Front Tracker Geometry. 18 modules In Italy. x6. 50 cm x 40 cm Modules are assembled to form larger chambers with different sizes Front tracker: Six 40 cm x 150 cm GEM layers INFN Funding: to be built in Italy

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The Bigbite second GEM tracker

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  1. The Bigbite second GEM tracker

  2. SBS GEM Trackers Front Tracker Geometry 18 modules In Italy x6 • 50 cm x 40 cm Modules are assembled to form • larger chambers with different sizes • Front tracker: Six 40 cm x 150 cm GEM layers • INFN Funding: to be built in Italy • Polarimeter trackers: Eight 50 cm x 200 cm GEM layers • to be built in Virginia 76 modules In Virginia Collaboration: INFN (Roma, Genova, Catania, Bari) and UVa SBS GEM trackers will form the largest area GEM tracker in the world

  3. UVacomponentof SBS WBS 2 (Neutron FF) • Fabricate 29 GEM modules by Oct 2014. • Assemble and test at least one 50 cm x 200 cm GEM layer ( 5 modules) for Bigbite. • Our plan is to build 12 (of the 29) SBS modules and instrument them with APV electronics in 2013. • So it will be possible to assemble two back GEM layers for BB in time for A1n. • All costs are budgeted into SBS WBS 2; no extra cost to A1n. • Graduate students from UVa for installation and commissioning.

  4. Preparations for the SBS GEM project • A 3.5 m x 3 mlevel-1000 clean-room at UVa • Clean room in a 4 mx 10 m semi-clean (1000 level) area. • Equipment to build 40 cm x 50 cm SBS modules: • GEM foil stretcher, with tension monitoring • Dry N2 HV box, with picoammeter, for testing GEM foils • Large ultra-sonic bath for cleaning frames • APV 25 readout system developed in Italy, going into production now • Two APV25 based readout systems with 5000 channels for testing GEMs: these systems being incorporated into CODA now. • Wiener MPOD High Voltage system with 16 sensitive HV channels • GEM chamber prototyping • INFN and UVa groups have built and tested seven 10 cm x 10 cm prototypes • 40 cm x 50 cm module design complete, has been optimized with two prototypes. • Two 40 x 50 cm prototypes built in Italy, two more at UVa.

  5. Prototype GEM trackertests and results 70 mm position resolution 10 cm x 10 cm prototype GEM trackerprearedto go into hall A Chargedepositioncorrelationbetweenx and ystripes

  6. GEM moduleconstruction status at UVa • All parts for 2 chambers now at hand: • Readout planes arrived 2 weeks ago. – 1 Rome type + 2 Uvatype • Spent about 2 months developing techniques for GEM assembly • Used test frames and foils • Final procedure well established now. • Final assembly of the first chamber (Uva type) this week and next week • Readout and 2 GEMs already glued and tested. • 1 more GEM, Cathode and gas window by early next week. • Finish assembly by end of next week. ZIF connectors Panasonic connectors SBS readout ( E.Cisbani, INFN Italy) New design (K. Gnanvo. Uva)

  7. GEM moduleconstruction status at UVa New 40 cm x 50 cm GEM stretcher at Uva Fully equipped INFN 40x50 cm2 GEM module for a beam test at DESY Cleanroom at UVa GEM foil and Frame HV test box

  8. GEM R&D and assembly facility at UVa New 40 cm x 50 cm GEM stretcher at Uva • The mechanical stretcher • Use for stretching GEM foil and glue it to spacer frames to keep it flat • Stretch the foil to a tension bigger than 1kg/cm • Method developed by Bencivenni. Et al. (LNF Italy) for LHCb GEM chambers\

  9. Test framesglued

  10. GEM R&D and assembly facility at UVa • GEM foil and Frame HV test box: - • checkforcurent (sectorcurrent < 5 nA) and sectorcapacitance.The 3foilstested so far havebeengood. • Test foilswere bad (highercurrents)

  11. GEM R&D and assembly facility at UVa

  12. GEM R&D and assembly facility at UVa

  13. K. Gnanvo - SoLID Coll. Meeting, 02/03/12

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