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Status of the FMD

Status of the FMD. Børge Svane Nielsen Niels Bohr Institute. Inner prototype status. Leakage current (specs < 3 μ A). Hamamatsu inner sensor prototype: well within specs → No changes for production → Outer sensor design started. 300 nA. IDEAS inner hybrid prototype:

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Status of the FMD

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  1. Status of the FMD Børge Svane Nielsen Niels Bohr Institute Børge Svane Nielsen, NBI

  2. Inner prototype status Leakage current (specs < 3 μA) Hamamatsu inner sensor prototype: well within specs → No changes for production → Outer sensor design started 300 nA IDEAS inner hybrid prototype: VA1_ALICE chips within specs Minor changes to hybrid details → 2nd prototype to be delivered mid Aug. Bias voltage 300 V Detector capacitance Prototype module (sandwich) status: m.i.p. particles seen (500 MeV e-) Noise level now as expected → Further beam tests 25-26 July → 2nd prototype mid Aug. 2 nF 300 V Readout electronics status: →ongoing Bias voltage Børge Svane Nielsen, NBI

  3. First inner type module Gluing of first ”sandwich” module and bonding at CERN 500 MeV e- beam test at Aarhus, DK FMD module e- beam sensor pitch adaptor hybrid Børge Svane Nielsen, NBI

  4. Aarhus beam test Recorded energy on single Si strip. Most e- beam outside strip acceptance. m.i.p. (wrong timing shifted peak down) Count Problems discovered: - wrong read-out timing - strip noise too high Expected m.i.p. signal New beam test scheduled 25 July Børge Svane Nielsen, NBI

  5. Prototype noise tests • Tests to eliminate noise: • bonded ”flat” module (to reduce hybrid-sensor capacitance): no change • various grounding schemes: no change • add noise filter to HV bias: noise reduced to expected value (6-700 ENC) • - noise level now independent of further shielding/grounding/power supply/... Flat module with external HV filter Sandwich module with HV filter on hybrid Børge Svane Nielsen, NBI

  6. Prototype noise tests Long strips (730 ENC) unbonded strips bad channels on hybrid Short strips (580 ENC) Børge Svane Nielsen, NBI

  7. Further prototype testing Lab test with sandwich and IDEAS readout ... and Digitizer+RCU readout • Good progress with prototype Digitizer and • USB version of RCU • Next: • complete Digitizer+RCU tests • repeat beam tests • build second sandwich with new hybrid RCU Digitizer Børge Svane Nielsen, NBI

  8. FMD internal mechanics Digitizer board Si sensor Hybrid Support plate: Al honeycomb (?) combined with cooling space for support feet Børge Svane Nielsen, NBI

  9. Overall dimensions(Flavio Tosello) A A 15 Top corner: Z = 727.5 R = 323.4 RB26 14 85 Cut view A-A R492.5 740 Tensioning device 80mm x 12mm SPD cone 36 R384 3rd cone Bottom corner: Z = 679.4 R = 258.4 26.9 R284 752 20 R172 R154 R35 628 668 134 R42 53 FMD3 45° V0-C Wheel center Z = 469.0 R = 60.0 R396 (?) R495 R400 28 45 180 309 85 849 Ring of the temporary support 30 Wings of the temporary support Børge Svane Nielsen, NBI 20

  10. Beam pipe and FMD3 support cone, RB26 side Carbon fibre cone designed (NBI+N.Golubev): 1:1 model used for integration tests Model was modified for integration tests: 4 supports + 4 wheels + wire tensioners Børge Svane Nielsen, NBI

  11. Integration test FMD3 Børge Svane Nielsen, NBI

  12. Finite element calculations of beam pipe support Input data weights: cone 4.82 kg detectors 3kg each (2 detectors) Load on each string (4 strings): 500 N But, realistic load is below: 50 N Carbon fibre structure Stresses below 7 MPa (safety factor 20) Displacements below 20 m Børge Svane Nielsen, NBI

  13. A A 15 Patch Panel + Air Duct envelope 10 FMD+pipe support shadow of supports of SPD optical connectors R492.5 740 Tensioning device RB24 SDD pre-manifold 26 SPD cone Overall dimensions(Flavio Tosello) ITS cone 78 R172 R284 R170 R154 (856?) R (?) 752 780 668 648 53 R42 13.1° 11.6° 800 (?) R (?) 834 R280 R400 R495 R415 180 85 1020 R540 30 Ring of the temporary support 20 Børge Svane Nielsen, NBI Wings of the temporary support 142

  14. ITS SIDE 10 R324 R334 60 10 R390 R492.5 ITS SIDE 134 114 142 26 10 60 60 10 FMD2 support Preliminary sketch of FMD+beampipe support on RB24 (F. Tosello) Børge Svane Nielsen, NBI

  15. FMD2 support Preliminary design of FMD+beampipe support on RB24 Børge Svane Nielsen, NBI

  16. Integration test FMD2 For integration test, a ’quick and heavy’ version of the FMD2 was used. Important dimensions were OK, materials too heavy, FMD protection missing. Børge Svane Nielsen, NBI

  17. FMD3 mechanics Internal mechanics as for FMD2 and FMD3. Missing a ’frame’ or ’box’ to attach to V0. Needs further interaction with integration team. Digitizer board Support plate Børge Svane Nielsen, NBI

  18. Conclusions • Inner type sensor (Hamamatsu) and hybrid (IDEAS) work to expectations → design of outer sensors started → ready to order all inner sensors now → 2nd hybrid prototype in August, small changes • Readout electronics tests with Digitizer and RCU ongoing • FMD3 cone: mechanical drawings ready to bring to carbon fibre industry • FMD2 support: detailed design to start in August • FMD1 box and support: details to be worked out in collaboration with integration team Børge Svane Nielsen, NBI

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