AMS02 Thermal Analysis

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AMS-02 Thermal Analysis
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Overview

• Extensive thermal modeling and analyses have been
  performed on AMS-02.
• Analyses are performed on an integrated system
  level as well as more detail sub-system and
  component levels.

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Organization

• Carlo Gavazzi Space (CGS) has overall
  responsibility for system level design and
  analysis
• AMS-02 Thermal Working Group (TWG) provides
  oversight and review for all thermal activities
• TWG includes NASA, ESCG, and AMS Collaboration
  members
• Sub-detector teams are responsible for their own
  thermal design and analysis

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System Level Analyses

• Top Level analyses are performed using a
  reduced AMS-02 model integrated with an ISS or
  Orbiter model
• System level analyses are performed both at
  CGS/Milan and at ESCG.
• SINDA/FLUINT, TSS and Thermal Desktop used for
  thermal analyses

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AMS-02 on ISS(TSS)
AMS-02
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AMS-02 on ISS S3 Truss(TSS)
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AMS-02 Geometry Model (Thermal Desktop)
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System Level Models

• Used for survey to determine extreme cases
• Used to directly analyze many subsystems
• Used to provide interface data for detailed
  subsystem models

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Subsystem Analyses

• System level model includes reduced (lower
  fidelity) models for several subsystems.
• CGS provides thermal interface data to subsystem
  analysts for detailed analyses.
• Comparison of results and iterations between
  system level and subsystems assure validity of
  interface data.

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Attitude Survey

• A survey of possible ISS attitudes was performed
  to determine extreme cases for all AMS-02
  subsystems
• Survey accounted for entire range of solar beta
  angles (-75º to 75º)
• Possible ISS attitudes considered
• Roll /-15º
• Yaw /-15º
• Pitch -20º to 15º (0º to 25º when orbiter
  docked)
• Altitudes from 150 to 270 nmi

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Attitude Survey (continued)

• 256 survey cases considered
• Results were screened to determine extreme cases
  for AMS-02 components
• All extreme cases were re-run using additional
  analytical detail and extreme hot or cold natural
  environments.

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Hot Cold Environments(per SSP 57003)
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Additional Analyses Considered

• In Payload Bay (undocked)
• In Payload Bay (docked to ISS)
• Transfer (between STS ISS)
• On ISS unpowered (8 hours for mission success,
  continuous for safety)

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Special Cases Considered

• Potential freezing of fluid systems
• TTCS (ESCG-4470-06-TEAN-DOC-0032)
• TRDGB (ESCG-4470-06-TEAN-DOC-0086)
• EVA Touch Temperature
• ESCG-4470-07-TEAN-DOC-0033
• Analysis of heaters with two failures
• AMS02-TN-CGS-007, Issue 2

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Special Cases (continued)

• Magnet charging/discharging
• Auto-ignition evaluation (pending)
• Stuck open vent door evaluation (pending)