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Technical Board, 12 July 2005Børge Svane Nielsen, NBI1 Status of the FMD Børge Svane Nielsen Niels Bohr Institute
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI2 Inner prototype status Leakage current (specs < 3 μA) Detector capacitance 300 nA 2 nF Bias voltage 300 V Bias voltage 300 V Hamamatsu inner sensor prototype: well within specs → No changes for production → Outer sensor design started IDEAS inner hybrid prototype: VA1_ALICE chips within specs Minor changes to hybrid details → 2nd prototype to be delivered mid Aug. 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. Readout electronics status: → ongoing
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI3 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 hybrid sensor pitch adaptor
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI4 Aarhus beam test Problems discovered: - wrong read-out timing - strip noise too high Count Expected m.i.p. signal m.i.p. (wrong timing shifted peak down) New beam test scheduled 25 July Recorded energy on single Si strip. Most e - beam outside strip acceptance.
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI5 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
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI6 Prototype noise tests Short strips (580 ENC) Long strips (730 ENC) bad channels on hybrid unbonded strips
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI7 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
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI8 FMD internal mechanics Support plate: Al honeycomb (?) combined with cooling Hybrid Si sensor space for support feet Digitizer board
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI9 A A Cut view A-A 15 14 740 SPD cone 53 FMD3 3 rd cone Tensioning device 80mm x 12mm Top corner: Z = 727.5 R = 323.4 Bottom corner: Z = 679.4 R = 258.4 752 628 R172 R42 R154 R284 Wheel center Z = 469.0 R = 60.0 20 134 309 28 R492.5 668 45° R384 36 85 26.9 R35 R396 (?) R400 R495 30 20 45 849 85 180 Ring of the temporary support Wings of the temporary support V0-C Overall dimensions (Flavio Tosello) RB26
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI10 Beam pipe and FMD3 support cone, RB26 side Model was modified for integration tests: 4 supports + 4 wheels + wire tensioners 1:1 model used for integration tests Carbon fibre cone designed (NBI+N.Golubev):
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI11 Integration test FMD3
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI12 Finite element calculations of beam pipe support Displacements below 20 m Stresses below 7 MPa (safety factor 20) 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
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI13 A A 15 10 740 1020 R415 R540 Patch Panel + Air Duct envelope R492.5 752 R154 R284 R170 shadow of supports of SPD optical connectors SPD cone ITS cone SDD pre-manifold 800 (?) R280 R (?) 53 R (?) 834 R172 R42 11.6°13.1° (856?) RB24 Ring of the temporary support Wings of the temporary support 30 20 R400 R495 85 180 FMD+pipe support 668 648 78 780 142 Tensioning device 26 Overall dimensions (Flavio Tosello)
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI14 Preliminary sketch of FMD+beampipe support on RB24 (F. Tosello) 60 114 134 10 142 ITS SIDE 26 ITS SIDE 60 R492.5 R390 R334 R324 60 10 FMD2 support
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI15 FMD2 support Preliminary design of FMD+beampipe support on RB24
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI16 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.
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI17 FMD3 mechanics Support plate Digitizer board Internal mechanics as for FMD2 and FMD3. Missing a ’frame’ or ’box’ to attach to V0. Needs further interaction with integration team.
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Technical Board, 12 July 2005Børge Svane Nielsen, NBI18 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
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