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2nd General VTX workshop

20–22 Apr 2026
DESY
Europe/Berlin timezone

Contribution List

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  1. 24. Welcome to DESY
    Ami Rostomyan (DESY)
    20/04/2026, 14:00
  2. 1. Status of VTX and workshop goals
    Jerome Baudot (IPHC-Strasbourg)
    20/04/2026, 14:15
  3. 2. WG2 sensor design report
    Thanh Hung Pham (BELLE (BELLE II Experiment))
    20/04/2026, 14:40
  4. 3. WG3 sensor testing report
    Christian Bespin (Universität Bonn)
    20/04/2026, 15:05
  5. 4. oVTX Design Status
    Maurizio Massa (BELLE (BELLE II Experiment))
    20/04/2026, 16:00

    (30' talk + 10' discussion)
    Items:
    - oVTX layout: L4,5,6 ladder design, fixing to the cones with sliding mechanism;
    - Mechanical characterisation of the new L6 prototypes. How to cope with starting deformation: thermal cycles by INFN-Pi and cold-glueing by the company;
    - thermal-fluid-dynamic bench with not-uniform heathers for 1-pipe cold plate and thermal simulations;
    - oVTX cooling...

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  6. 5. Status of the Design of the 4-chip Cu Dummy flex
    Massimo Minuti (BELLE (BELLE II Experiment))
    20/04/2026, 16:40

    (20' talk + 10' discussion)
    Items covered:
    -Design/order status, estimated delivery time
    -Implementation of temperature sensors' reading
    -Plan for the test in Vienna: chip emulation by FPGA

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  7. 6. oVTX Module/Ladder assembly
    Stefano Bettarini (BELLE (BELLE II Experiment))
    20/04/2026, 17:10

    (20' Talk + 20' discussion)
    Items covered:
    - Specifications & QA;
    - modules (i.e. electrical unit) assembly;
    - ladders (mechanical unit) assembly;
    - Tools (chuck/jigs), prototype's parts procurements and assembly procedures development;
    - Construction sites / schedule.

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  8. 7. Plans towards iVTX ladder prototypes with TPG
    Julien Bonis (BELLE (BELLE II Experiment))
    21/04/2026, 08:30

    (10' talk + 5' discussion)
    Items:
    - Parts (TPG, Si, parylene, ...) procurement;
    - Prototype assembly procedures;
    - Thermal test plans and expectations from simulations.

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  9. 29. Result of dicing samples at the iVTX dimension
    Mr Mathieu Goffe (DESY (Deutsches Elektronen Synchrotron))
    21/04/2026, 08:45
  10. 8. iVTX developments at QMUL
    Adrian Bevan (BELLE (BELLE II Experiment)), Dr Ali Awais (BELLE (BELLE II Experiment)), Dhyey Ketan Joshi (QMU London), Dominic Howgill (BELLE (BELLE II Experiment))
    21/04/2026, 08:50

    (20' talk + 5' discussion)
    Progress on the sliding mechanism and overall iVTX mechanical support
    Conductivity measurement
    Fallabck cooling option

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  11. 11. Thermal conductivity of irradiated TPG
    Franz matejcek (U. Frankfurt)
    21/04/2026, 11:00

    (20' talk + 5' discussion)

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  12. 9. RDL: electrical measurements on IZM structures and prototype
    Mr Andreas Ulm (BELLE (BELLE II Experiment))
    21/04/2026, 11:25

    (20' talk + 5' discussion)
    Items:
    - eye diagrams of the IZM test structures;
    - from IZM: proposal to manufacture the ladders;
    - iVTX flex circuit (from ladder to the lpGBT/VTRx+ board).

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  13. 12. LS2 IR mechanics activity status and plan
    Shuji Tanaka (BELLE (BELLE II Experiment))
    21/04/2026, 13:00

    (30' talk + 10' discussion)

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  14. 13. oVTX services and rings' shape
    Margherita Rovini (BELLE (BELLE II Experiment))
    21/04/2026, 13:40

    (5' talk + 5' discussion)

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  15. 14. oVTX Ladder mount concept "a la SVD" (compliant with the sliding mechanism)
    Maurizio Massa (BELLE (BELLE II Experiment))
    21/04/2026, 13:50

    (5' Talk + 5' discussion)

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  16. 22. Discussion also with STL
    21/04/2026, 14:00
  17. 25. Discussion
    Carsten Niebuhr (DESY), Fabian Becherer (BELLE (BELLE II Experiment)), Karsten Gadow (BELLE (BELLE Gruppe)), Maiko Takahashi (BELLE (BELLE II Experiment))
    21/04/2026, 14:35
  18. 15. Status and plan for VTX simulations & performance
    Vidya Sagar Vobbilisetti (CPPM France)
    21/04/2026, 16:45
  19. 16. Status of Upgrade performance studies
    Alessandro Gaz (University of Padova & INFN)
    21/04/2026, 17:05
  20. 27. Discussion on on-going or next tasks
    21/04/2026, 17:25
  21. 23. Discussion with STL
    21/04/2026, 17:55
  22. 17. WG5 general
    Christian Irmler (MBI Vienna)
    22/04/2026, 08:00
  23. 18. Results of lpGBT and VTRx+ irradiation campaign
    Markus Friedl (MBI Vienna)
    22/04/2026, 08:10
  24. 19. Update lpGBT testing for iVTX at CPPM
    Patrick Breugnon (BELLE (BELLE II Experiment))
    22/04/2026, 08:35
  25. 20. Report from Chinese Groups WG5
    Jingzhou Zhao (BELLE (BELLE II Experiment))
    22/04/2026, 08:55
  26. 21. Requirements on the Interface between VTX back-end and Belle II Trigger
    Taichiro Koga (BELLE (BELLE II Experiment))
    22/04/2026, 09:15
  27. 26. WG6 - plan for OBELIX telescope
    Carlos Marinas (IFIC (CSIC-UV))
    22/04/2026, 09:30
  28. 30. TDR discussion
    Jerome Baudot (IPHC-Strasbourg)
    22/04/2026, 10:20
  29. 28. Points to be discussed & discussion
    Jerome Baudot (IPHC-Strasbourg)
    22/04/2026, 11:20
    • new chat
    • database for VTX parts
    • documentation
    • groups in Gitlab
    • next workshop

    Requests to institutes for
    - Upgrade Group
    - Project-level information?needed for TDR

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  30. 10. New QMUL set-up for In/Through plane thermal conductivity
    Adrian Bevan (BELLE (BELLE II Experiment))

    (10' talk + 5' discussion)

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