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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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Presentation on theme: "Technical Board, 12 July 2005Børge Svane Nielsen, NBI1 Status of the FMD Børge Svane Nielsen Niels Bohr Institute."— Presentation transcript:

1 Technical Board, 12 July 2005Børge Svane Nielsen, NBI1 Status of the FMD Børge Svane Nielsen Niels Bohr Institute

2 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 July → 2nd prototype mid Aug. Readout electronics status: → ongoing

3 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

4 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.

5 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

6 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

7 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

8 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

9 Technical Board, 12 July 2005Børge Svane Nielsen, NBI9 A A Cut view A-A SPD cone 53 FMD3 3 rd cone Tensioning device 80mm x 12mm Top corner: Z = R = Bottom corner: Z = R = R172 R42 R154 R284 Wheel center Z = R = R ° R R35 R396 (?) R400 R Ring of the temporary support Wings of the temporary support V0-C Overall dimensions (Flavio Tosello) RB26

10 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):

11 Technical Board, 12 July 2005Børge Svane Nielsen, NBI11 Integration test FMD3

12 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

13 Technical Board, 12 July 2005Børge Svane Nielsen, NBI13 A A R415 R540 Patch Panel + Air Duct envelope R R154 R284 R170 shadow of supports of SPD optical connectors SPD cone ITS cone SDD pre-manifold 800 (?) R280 R (?) 53 R (?) 834 R172 R °13.1° (856?) RB24 Ring of the temporary support Wings of the temporary support R400 R FMD+pipe support Tensioning device 26 Overall dimensions (Flavio Tosello)

14 Technical Board, 12 July 2005Børge Svane Nielsen, NBI14 Preliminary sketch of FMD+beampipe support on RB24 (F. Tosello) ITS SIDE 26 ITS SIDE 60 R492.5 R390 R334 R FMD2 support

15 Technical Board, 12 July 2005Børge Svane Nielsen, NBI15 FMD2 support Preliminary design of FMD+beampipe support on RB24

16 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.

17 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.

18 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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