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Status of SVD

BPAC November 2011. Status of SVD. Markus Friedl (HEPHY Vienna) on behalf of the Belle II SVD Collaboration. Outline. Introduction Sensors & Origami Beam Test & Plans Cooling Mechanics Electronics Summary. Configuration. 4 layers (L3…L6; r=38…140 mm) Total 49 ladders

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Status of SVD

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  1. BPAC November 2011 Status of SVD Markus Friedl (HEPHY Vienna) on behalf ofthe Belle II SVD Collaboration

  2. Outline Markus Friedl (HEPHY Vienna): Status of SVD Introduction Sensors & Origami Beam Test & Plans Cooling Mechanics Electronics Summary

  3. Markus Friedl (HEPHY Vienna): Status of SVD

  4. Configuration Markus Friedl (HEPHY Vienna): Status of SVD • 4 layers (L3…L6; r=38…140 mm) • Total • 49 ladders • 187 sensors (1.24 m2) • 1902 APV25 chips

  5. Rocket Science… Sensor underneath flex circuit End ring (support) APV25 chips Origami ladder Pitch adapter bentaround sensor edge Cooling pipe Markus Friedl (HEPHY Vienna): Status of SVD

  6. Double-Sided Silicon Sensors HPK Micron Markus Friedl (HEPHY Vienna): Status of SVD

  7. Double-Sided Silicon Sensors Atoll Common Combined Markus Friedl (HEPHY Vienna): Status of SVD • Large rectangular sensors • 3 prototype batches delivered with increasing quality • Order placed • Trapezoidal sensors • Prototype batch delivered • Tested in beam before and after irradiation • Submitted with redesigned p-stop in October

  8. Origami Module Markus Friedl (HEPHY Vienna): Status of SVD First 2 prototypes with longest flex circuit in 2010 Flex redesign with new (cheaper) connector and other minor improvements 3 new Origami modules built in 2011

  9. Assembly: Joint Venture Markus Friedl (HEPHY Vienna): Status of SVD • Another Origami built in a joint effort of Tohoku, Seoul, Mumbai and Vienna • New assembly jigs designed in Tohoku • To be extended for full ladder later

  10. LadderAssembly Sites Markus Friedl (HEPHY Vienna): Status of SVD • Potential locations: • Vienna – certain • Japan – verylikely (requiresbondingstation) • Seoul – quitelikely (requiresbondingstation) • Melbourne – maybe (requiresfunding) • Karlsruhe – unlikely (otherpriorities) • Mumbai – problematic (APV25 exportrestrictions)

  11. Lorentz Force Markus Friedl (HEPHY Vienna): Status of SVD Windmill structure means overlap between adjacent ladders (for hermetic coverage and alignment) Can be done in 2 ways Lorentz force deflects electrons (more) and holes (less) We want to minimize the cluster spread to maintain good spatial resolution We use n-type bulk and the p-strips are in parallel to the magnetic field (n-strips are irrelevant)

  12. Charge Collection Markus Friedl (HEPHY Vienna): Status of SVD Shockley-Ramo theoremsaysthat a movingchargeinduce a current in theelectrode In thepast, weconsideredelectronsandholesequallyimportantforthiscurrent However, werecentlyfound out thatthisisonlytruefor a parallel-plateconfiguration, but not for a stripdetector There, thechargesterminating on theelectrodedominate due tothehighlynonlinearweightingfield (in ourcase: holes)

  13. Charge Collection Weighting Potential Inducedcurrents h+ e- Ownsimulation; notethenonlinearscale! H.Spieler http://www-physics.lbl.gov/~spieler/physics_198_notes_1999/PDF/IX-1-Signal.pdf Markus Friedl (HEPHY Vienna): Status of SVD 300 µm thick, 50 µm pitch, n-bulk, p-strips

  14. Windmill Orientation TDR case Havetoflipw.r.t. TDR! Markus Friedl (HEPHY Vienna): Status of SVD

  15. Beam Test 2011 Markus Friedl (HEPHY Vienna): Status of SVD

  16. Beam Test 2011 Markus Friedl (HEPHY Vienna): Status of SVD • Late September/early October@ SPS • New test box with xy stage • Will later be used for automated ladder tests with a source • Operated 3 Origami modules with CO2 cooling • Data analysis underway

  17. Plans for 2012 Week 3 Week 1 Week 2 Markus Friedl (HEPHY Vienna): Status of SVD • Applying for another SPS beam test • Plan: • Week 1: beam test (SPS) • Week 2: gamma irradiation (Mol, Belgium) • Week 3: beam test (SPS) • With Origami modules and new trapezoidal Micron sensors

  18. CO2 Cooling Markus Friedl (HEPHY Vienna): Status of SVD Open (blow) system operated from a CO2 battery Stable operation at ~1 g/s mass flow for several days Front-end temperature -16°C (Origami modules)

  19. CO2 Cooling +20 Temperature [°C] 0 -20 Stable cold operation Tried colder Time [s] Markus Friedl (HEPHY Vienna): Status of SVD

  20. Closed-loop CO2 Cooling Plant Markus Friedl (HEPHY Vienna): Status of SVD Developed commonly by PXD and SVD together with experts from CERN All parts for 1 kW test system delivered, assembly started Strict Japanese regulations can be avoided when pressure at room temperature <5 MPa

  21. SVD Halves Markus Friedl (HEPHY Vienna): Status of SVD • Splitting / compositioncan also bedoneifthenumberofladdersis not even in all layers • In thedrawings: • L3: not shown(7or 8 ladders) • L4: 10 ladders • L5: 14 ladders • L6: 17ladders

  22. End Ring Tests Markus Friedl (HEPHY Vienna): Status of SVD • End ring prototype with integrated cooling channel • Pressure test up to 200 bar • no leak, no deformation measured on CMM • Mount point flatness measured on CMM • 7 µm (avg) or 17 µm (max) – no change under pressure

  23. Readout Chain Finesse Transmitter Board (FTB) FADC+PROC 1902APV25chips ~2mcoppercable Junctionbox ~10mcopper cable Unified opticaldata link (>20m) COPPER Front-endhybrids Rad-hardvoltageregulators Analog level translation,datasparsificationandhit time reconstruction Unified Belle IIDAQ system Markus Friedl (HEPHY Vienna): Status of SVD Analog APV25 readout is through copper cable to FADCs Sparsification and hit time finding is done in FADC modules Data is passed on through FTB to COPPER readout system

  24. Hit Time Finding Markus Friedl (HEPHY Vienna): Status of SVD Intended to reduce the occupancy by comparison of particle timing to trigger timing APV25 can record multiple samples (x) along shaped waveform Peak time andamplitude canbe reconstructed 2…4 ns RMSprecision measured withOrigami (clusterSNR 14…23)

  25. Occupancy Reduction BelleSVD2 Belle IISVD Belle IISVD with Hit time finding Markus Friedl (HEPHY Vienna): Status of SVD Should be sufficient to cope with 40-fold increase in luminosity

  26. Data Recovery in FADC Optimized channel Non-optimized channel Raw APV25 output FIR without with • FIR filter with 8 coefficients operating continuously at 40MHz • Described in detail in Belle II Note (B2N0007) Markus Friedl (HEPHY Vienna): Status of SVD Digital FIR filter in FPGA to compensate cable distortion

  27. Grounding Markus Friedl (HEPHY Vienna): Status of SVD Common Belle II grounding effort started SVD front-end is floating (all LV is on +/- HV bias potentials) Cooling pipes are isolated by SilPad (thin, thermally conductive) sheets This scheme was already used in several beam tests HV return (=GND) can be connected at front-end if needed

  28. Finesse Transmitter Board (FTB) Markus Friedl (HEPHY Vienna): Status of SVD • Sends FADC data through optical link to • COPPER • Pixel system (Giessen box) • First boards now under test in Cracow

  29. Summary Markus Friedl (HEPHY Vienna): Status of SVD 4 layers with straight/slanted configuration Double-sided 6” sensors delivered by HPK (rectangular) and Micron (trapezoidal) Several Origami modules produced Beam test 2011 with CO2 cooling of 3 Origami ladders Combined beam test + irradiation planned for 2012 Closed loop cooling plant is being developed Hit time finding to reduce occupancy Common grounding effort started Finesse Transmitter board: first boards now under test

  30. Thank you for your attention. Markus Friedl (HEPHY Vienna): Status of SVD

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