1 / 29

FPU Structure, Baffle and Straylight

This document details the structural and thermal analyses of the PACS (Photodetector Array Camera and Spectrometer) Focal Plane Unit (FPU) for integration into spectrometer systems. It covers key design features, including the baffle and stray light suppression, thermal models, and cryogenic testing results. The FPU demonstrates high stray light suppression, comprehensive thermal management, and validated structural integrity through extensive vibration tests. Documentation of completed analyses and structural status, as well as future tasks, is thoroughly provided to ensure successful implementation in the PACS project.

winter-zamora
Télécharger la présentation

FPU Structure, Baffle and Straylight

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. FPU Structure, Baffle and Straylight R. Graue, D. Kampf Kayser-Threde PACS FPU

  2. Field Mirror for Spectrometer Collimator housing Photometer housing Alignment Cube Blue Spectrometer Connector Panel Top Optics housing 4 K Thermal Strap Entrance to FPU Bolometer housing 2 K Feed Thru FPU foot 2 axis Red Spectrometer Connector Panel Spectrometer housing FPU foot 1 axis Primary Structure Chopper Cover PACS FPU

  3. FPU STM PACS FPU

  4. Bolometer Integration PACS FPU

  5. Straylight Analyses – Top Optic Model • ASAP Model of Top Optics • Derived from optical ZEMAX Model • Black Coated Walls (>0.4 mm) PACS FPU

  6. Straylight Analyses – Results and Status • High straylight suppression • Neglible straylight impacts in consequent boxes • Inputs considered for Baffle Design • Straylight suppression 1e-10 to focal plane • Modell delivered to ASTRIUM PACS FPU

  7. 2K - Feed Through • Cryo STM Vibration Tested • Manufactured and Delivered Outside sleeve Cold finger D/E: Retainer ring 1/2 F: Muff G: Ring PACS FPU

  8. FPU Suspension Design Status and Material • Status: • Design: completed • Documentation: Completed • Material • Fibre: T300 • Resin: Ciba Geigy • Araldit LY-3505 • Hardener XP 3403 PACS FPU

  9. FPU Suspension Cryo Qualification Test Matrix • Status • Static load tests: completed • (Cold) material characterisation: completed • Cryovibration tests: complete (CRYO STM FPU) PACS FPU

  10. MGSE and CVSE Status • MGSE design, procurement and functional test completed • Vibration test adapter • Lifting device • Integration Tools • FW Test Box • CVSE design, procurement (cryostat) and functional test completed KT Cryostat Test Faciliy for Stability Tests PACS FPU

  11. Mass Budget *IR Black Paint, Internal Harness, Screws Contingency not needed PACS FPU

  12. Performed FPFPU Analyses Program PACS FPU

  13. PACS Thermal Model PACS-Thermal Model (Input-Status: May 2003) - PACS thermal model used as submodel of the H-EPLM reduced thermal model - PACS submodel consists of 154 thermal nodes PACS-TMM includes: - All mechanisms, all harness, radiative environment - Possibility of transient analysis (cool-down and operational time-line) PACS FPU

  14. Thermal Analyses - Status - Completed Tasks • Thermal Analyses • Quasisteady state and transient thermal analyses • Calibration of thermal model (cooling down curves) after Cryo STM tests • Analyses of thermal links (2 K) wrt conductivity • Documentation released PACS FPU

  15. PACS Cool-Down Behaviour PACS FPU

  16. PACS Thermal Analyses - Open Tasks • - Update of the cryostat-TMM (Sept. 2003) not yet included • - Dissipation values of the grating and the calibration sources are no measured values • Impact of Electrical insulation between spectrometers and cooling-straps not yet defined • - Results of the discussion of the cooling-strap-IFs not yet included • - Contact resistances at the cooling-strap-I/Fs only assumed, but not measured PACS FPU

  17. Structural Analyses - Status - Completed Tasks(see H/O wrt. STM warm/cold vibration) • Structural Analyses • Evaluation of ambient and cold vibration tests • FEM calibration • Load analyses with calibrated model (cryo-vibration test) • Strength analyses for FPU metallic and CFRP components • Cryogenic material properties analyses • CoG, MoI analyses • Displacement, distortion, deformation analyses • Documentation released PACS FPU

  18. FPU Structure Status – External Interfaces • Design envelope frozen • Optical beam stay out frozen • OB envelope frozen  DCNs of Assembly and IF Drawing version 27 to be approved PACS FPU

  19. Documents Status • ICDs • Chopper, FW, Calibration Source, Filters/ Dichroics, Ga:Ga Detector, Grating: approved • Bolometer, Distribution Boards: approved • Cryogenic harness and connectors: approved • Procurement specifications (structures, mirror, coating, screws/helicoils, Si -lens, emitter for CS , etc.) approved • AIV and functional/environmental test plan: updated • Filled in verification matrix: latest status (10.2003) PACS FPU

  20. Configuration Control Documents PACS FPU

  21. Approved Engineering Documents PACS FPU

  22. PA Activities (KT) • Approved Documents • PMP (Update) • CIDL (Update) • CIL (Issue1) • PA Plan (Update) • MIP/KIP plan (Update) • Inputs to FMECA (Update) • Approved procurement/manufacturing documentation/drawings • Configuration Control PACS FPU

  23. MIP / KIP List • Inspection • FW assembly (CQM/PFM) after functional and environmental testing • Calibration source (CQM/PFM) after environmental and functional testing • Coated mirrors (CQM/PFM) • FPU after vibration tests (CQM/PFM) • Distribution boards and harness after manufacturing and functional testing (CQM/PFM) • Fit check inspection after manufacturing and coating of aluminium structure (STM/CQM/PFM) • Functional performance verification after FPU alignment (CQM/PFM) PACS FPU

  24. MAIV Status of Structural Items -Completed Tasks • CQM • Mechanical items design and manufacturing drawings completed and released • STM/ CQM metallic items manufactured and IR black coated • Mechanical Fit check/Preintegration of all mechanical items (on boxes and FPU level) • STM/ CQM CFRP items manufactured and static load tested • Cooling straps manufactured • PFM • Structural items design and manufacturing drawings completed and released • CFRP items manufactured and static load tested PACS FPU

  25. MAIV Status of Structural Items - OpenTasks • CQM • Thermal Contact Soldering and Ge:Ga detector attachment (sapphire embedding) of CQM cooling straps in progress (until end of Nov. 2003) • Development of Ge:Ga Detector electrical isolation (thick layer coating) under progress (until end of Nov. 2003) • PFM • Substructures and metallic components manufacturing in progress until April 2004 • Preassembly/fit check until June 2004 • Finish and black Coating until July 2004 PACS FPU

  26. FPFPU Cryo Vibration Qualification Breakdown See dedicated chapters PACS FPU

  27. PACS FPU Verification Similarity • CQM and STM were manufactured parallel with the same drawingsout of the same lot Qualification Tests • STM vibration tests Tests completed Conclusion: FPFPU Housing is structurally qualified PACS FPU

  28. CQM SCHEDULE • Manufacturing • CQM primary/secondary structures thermal treatment /manufacturing /IR coating sequentially completed • CQMoptical components delivered • CQM CFRP struts and 2 K feed through material test program and manufacturing completed • AIV (Final assembly and alignment) • CQM from 7/03 to 1/04 (tbc) PACS FPU

  29. PFM SCHEDULE • Manufacturing • PFM primary/secondary structures thermal treatment /manufacturing /IR coating to be completed until 6.2004 • PFM optical components delivered • PFM CFRP struts and 2 K feed through material test program and manufacturing completed • AIV (Final assembly and alignment) • PFM from 7/04 to 11/04 PACS FPU

More Related