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7D: Tray test plans

Gamma-ray Large Area Space Telescope. 7D: Tray test plans. GLAST Large Area Telescope: Tracker Subsystem. Nicola Mazziotta University and INFN Bari - Italy mazziotta@ba.infn.it. Outline. Overview Tray test matrix Panel vib plan Tray thermal plan Test schedule Stacked cosmic rays.

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7D: Tray test plans

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  1. Gamma-ray Large Area Space Telescope 7D: Tray test plans GLAST Large Area Telescope:Tracker Subsystem Nicola MazziottaUniversity and INFNBari - Italymazziotta@ba.infn.it

  2. Outline • Overview • Tray test matrix • Panel vib plan • Tray thermal plan • Test schedule • Stacked cosmic rays • Reference LAT Documents: • LAT-MD-00408, LAT Instrument Performance Verification Plan • LAT-SS-00788, LAT Environmental Specification • LAT-TD-01005, Thermal Test Results on Thick Converter Mock-up Trays • LAT-TD-01249, Thermal Test Results for Pre-Engineering Model Trays • LAT-PS-01584, LAT Tracker TraySSD Ladder Panel Assembly Procedure • LAT-TD-00154, Tray Vibration Test Plan • LAT-TD-01839, Tray Thermal Test Plan

  3. Tray test matrix

  4. Tray factory (panels) Vibration test* Ladder factory Tray assembly: ladders and MCMs on trays Stacked cosmic rays* Electrical test Tower assembly Electrical test before MCMs encapsulation Tray functional test* Tray thermal cycles* Overview *Environmental tests

  5. Panel vib levels Sine sweep White Noise Random vibration

  6. × Panel vib set up W side on the top • Accelerometers: • Control: two mono-axial accelerometers positioned on two of the four L-shaped block TP1&TP2 • Fixture: three mono axial accelerometers placed on a corner on one of the four L-shaped block TP6 • Tray: one three-axial accelerometers in the middle of panel TP5 • Centrotecnica set up: • - 1 LDS shake table • 2 fixtures • 9 read out channels • 4 tested trays/day rate

  7. Panel vib sequence thrust axis

  8. Tray thermal levels On orbit temperature range -15°C  30°C

  9. Tray thermal sequence The tray will be tested in its own service box.

  10. Test schedule Vib test rate ≥ 4 panels/day (Centrotecnica-Milano) Thermal test lot ≥ 4 trays/cycle in 4 climatic chambers (2 ready by Pg in Terni, 1 foreseen in Pi, 1 foreseen in Ba) Test rate/climatic chamber ∼ 1 tower/month

  11. Cosmic rays test Tray stacked in single view 2 stacks for a whole tower, readout with a single TEM

  12. Conclusions • The thermal and vibe tests on trays are well understood • The vibe test rate in Centrotecnica is adequate • The thermal test rate with the Perugia equipment in Terni is just sufficient, but the test lines will be doubled • The mechanics to perform cosmic rays tests is under construction. The flux allows a test in realistic time. The mini-tower experience will be the ground base to define the cosmic rays test.

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